[PATCH 00/19] drm/panel: support Waveshare DSI TOUCH kits

[PATCH 00/19] drm/panel: support Waveshare DSI TOUCH kits

[Dmitry Baryshkov]

The Waveshare DSI TOUCH family of DSI panel kits feature different DSI
video-mode panels, bundled with the separate controlling circuit,
produing necessary voltages from the 3.3V and 5V supplies. Extend panel
drivers to support those Waveshare panels and also add GPIO driver for
the onboard control circuitry.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
Dmitry Baryshkov (19):
      dt-bindings: display/panel: himax,hx83102: describe Waveshare panel
      dt-bindings: display/panel: himax,hx8394: describe Waveshare panel
      dt-bindings: display/panel: jadard,jd9365da-h3: describe Waveshare panel
      dt-bindings: display/panel: ilitek,ili9881c: describe Waveshare panel
      dt-bindings: dipslay/panel: describe panels using Focaltech OTA7290B
      drm/of: add helper to count data-lanes on a remote endpoint
      drm/panel: himax-hx83102: support Waveshare 12.3" DSI panel
      drm/panel: himax-hx8394: set prepare_prev_first
      drm/panel: himax-hx8394: simplify hx8394_enable()
      drm/panel: himax-hx8394: support Waveshare DSI panels
      drm/panel: jadard-jd9365da-h3: use drm_connector_helper_get_modes_fixed
      drm/panel: jadard-jd9365da-h3: support variable DSI configuration
      drm/panel: jadard-jd9365da-h3: set prepare_prev_first
      drm/panel: jadard-jd9365da-h3: support Waveshare DSI panels
      drm/panel: ilitek-ili9881c: support Waveshare 7.0" DSI panel
      drm/panel: add devm_drm_panel_add() helper
      drm/panel: add driver for Waveshare 8.8" DSI TOUCH-A panel
      dt-bindings: gpio: describe Waveshare GPIO controller
      gpio: add GPIO controller found on Waveshare DSI TOUCH panels

 .../bindings/display/panel/focaltech,ota7290b.yaml |   70 +
 .../bindings/display/panel/himax,hx83102.yaml      |    2 +
 .../bindings/display/panel/himax,hx8394.yaml       |    2 +
 .../bindings/display/panel/ilitek,ili9881c.yaml    |    2 +
 .../bindings/display/panel/jadard,jd9365da-h3.yaml |    6 +
 .../bindings/gpio/waveshare,dsi-touch-gpio.yaml    |  100 ++
 drivers/gpio/Kconfig                               |   10 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-waveshare-dsi.c                  |  220 +++
 drivers/gpu/drm/drm_of.c                           |   34 +
 drivers/gpu/drm/drm_panel.c                        |   23 +
 drivers/gpu/drm/panel/Kconfig                      |   13 +
 drivers/gpu/drm/panel/Makefile                     |    1 +
 drivers/gpu/drm/panel/panel-focaltech-ota7290b.c   |  208 +++
 drivers/gpu/drm/panel/panel-himax-hx83102.c        |  144 +-
 drivers/gpu/drm/panel/panel-himax-hx8394.c         |  279 +++-
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c      |  251 +++-
 drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c   | 1563 ++++++++++++++++++--
 include/drm/drm_of.h                               |   13 +
 include/drm/drm_panel.h                            |    1 +
 20 files changed, 2813 insertions(+), 130 deletions(-)
---
base-commit: 3b058d1aeeeff27a7289529c4944291613b364e9
change-id: 20260401-waveshare-dsi-touch-e1717a1ffc40

Best regards,
--  
With best wishes
Dmitry

[PATCH 01/19] dt-bindings: display/panel: himax,hx83102: describe Waveshare panel

[Dmitry Baryshkov]

Describe Waveshare 12.3-DSI-TOUCH-A panel which allegedly uses HX83102
as a panel controller.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml b/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml
index 66404b425af3..7667428bf9a8 100644
--- a/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml
+++ b/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml
@@ -30,6 +30,8 @@ properties:
           - starry,2082109qfh040022-50e
           # STARRY himax83102-j02 10.51" WUXGA TFT LCD panel
           - starry,himax83102-j02
+          # Waveshare 12.3-DSI-TOUCH-A panel
+          - waveshare,12.3-dsi-touch-a
       - const: himax,hx83102
 
   reg:

-- 
2.47.3

Re: [PATCH 01/19] dt-bindings: display/panel: himax,hx83102: describe Waveshare panel

[Krzysztof Kozlowski]

On Wed, Apr 01, 2026 at 10:26:20AM +0300, Dmitry Baryshkov wrote:
> Describe Waveshare 12.3-DSI-TOUCH-A panel which allegedly uses HX83102
> as a panel controller.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml b/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml
> index 66404b425af3..7667428bf9a8 100644
> --- a/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml
> @@ -30,6 +30,8 @@ properties:
>            - starry,2082109qfh040022-50e
>            # STARRY himax83102-j02 10.51" WUXGA TFT LCD panel
>            - starry,himax83102-j02
> +          # Waveshare 12.3-DSI-TOUCH-A panel
> +          - waveshare,12.3-dsi-touch-a

I don't think we use '.' in compatibles, so waveshare,12-3-dsi-touch-a

Best regards,
Krzysztof

Re: [PATCH 01/19] dt-bindings: display/panel: himax,hx83102: describe Waveshare panel

[Linus Walleij]

On Thu, Apr 2, 2026 at 10:30 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> On Wed, Apr 01, 2026 at 10:26:20AM +0300, Dmitry Baryshkov wrote:

> > +          # Waveshare 12.3-DSI-TOUCH-A panel
> > +          - waveshare,12.3-dsi-touch-a
>
> I don't think we use '.' in compatibles, so waveshare,12-3-dsi-touch-a

Qualcomm happen to use periods in similar cases for their
"qualcomm universal peripheral":
Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml

I don't know if the policy changed since, but that's a big and widespread
platform and I never saw it challenged so I think it's kind of established
that we do.

Yours,
Linus Walleij

Re: [PATCH 01/19] dt-bindings: display/panel: himax,hx83102: describe Waveshare panel

[Krzysztof Kozlowski]

On 07/04/2026 11:38, Linus Walleij wrote:
> On Thu, Apr 2, 2026 at 10:30 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>> On Wed, Apr 01, 2026 at 10:26:20AM +0300, Dmitry Baryshkov wrote:
> 
>>> +          # Waveshare 12.3-DSI-TOUCH-A panel
>>> +          - waveshare,12.3-dsi-touch-a
>>
>> I don't think we use '.' in compatibles, so waveshare,12-3-dsi-touch-a
> 
> Qualcomm happen to use periods in similar cases for their
> "qualcomm universal peripheral":
> Documentation/devicetree/bindings/i2c/qcom,i2c-qup.yaml
> 
> I don't know if the policy changed since, but that's a big and widespread
> platform and I never saw it challenged so I think it's kind of established
> that we do.

That example is ancient, but you are right that this is widespread
pattern. I wonder why this 'dot' here felt odd - assumed that 'dot' in
version is something else than 'dot' in other place.. dunno, it's fine.

Best regards,
Krzysztof

Re: [PATCH 01/19] dt-bindings: display/panel: himax,hx83102: describe Waveshare panel

[Krzysztof Kozlowski]

On 01/04/2026 09:26, Dmitry Baryshkov wrote:
> Describe Waveshare 12.3-DSI-TOUCH-A panel which allegedly uses HX83102
> as a panel controller.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/panel/himax,hx83102.yaml | 2 ++

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

[PATCH 02/19] dt-bindings: display/panel: himax,hx8394: describe Waveshare panel

[Dmitry Baryshkov]

Describe Waveshare 5" and 5" DSI panels which use HX9365-E as a panel
controller.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml b/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
index 84e840e0224f..83c343b02835 100644
--- a/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
+++ b/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
@@ -23,6 +23,8 @@ properties:
               - hannstar,hsd060bhw4
               - microchip,ac40t08a-mipi-panel
               - powkiddy,x55-panel
+              - waveshare,5.0-dsi-touch-a
+              - waveshare,5.5-dsi-touch-a
           - const: himax,hx8394
       - items:
           - enum:

-- 
2.47.3

Re: [PATCH 02/19] dt-bindings: display/panel: himax,hx8394: describe Waveshare panel

[Krzysztof Kozlowski]

On Wed, Apr 01, 2026 at 10:26:21AM +0300, Dmitry Baryshkov wrote:
> Describe Waveshare 5" and 5" DSI panels which use HX9365-E as a panel
> controller.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml b/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
> index 84e840e0224f..83c343b02835 100644
> --- a/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
> @@ -23,6 +23,8 @@ properties:
>                - hannstar,hsd060bhw4
>                - microchip,ac40t08a-mipi-panel
>                - powkiddy,x55-panel
> +              - waveshare,5.0-dsi-touch-a
> +              - waveshare,5.5-dsi-touch-a

Same comment about style.

Best regards,
Krzysztof

Re: [PATCH 02/19] dt-bindings: display/panel: himax,hx8394: describe Waveshare panel

[Krzysztof Kozlowski]

On 01/04/2026 09:26, Dmitry Baryshkov wrote:
> Describe Waveshare 5" and 5" DSI panels which use HX9365-E as a panel
> controller.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

[PATCH 03/19] dt-bindings: display/panel: jadard,jd9365da-h3: describe Waveshare panel

[Dmitry Baryshkov]

Describe Waveshare DSI panels which use JD9365 as a panel controller.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 .../devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml       | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml b/Documentation/devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml
index e39efb44ed42..4eae802de9fd 100644
--- a/Documentation/devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml
+++ b/Documentation/devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml
@@ -24,6 +24,12 @@ properties:
           - radxa,display-10hd-ad001
           - radxa,display-8hd-ad002
           - taiguanck,xti05101-01a
+          - waveshare,3.4-dsi-touch-c
+          - waveshare,4.0-dsi-touch-c
+          - waveshare,8.0-dsi-touch-a
+          - waveshare,9.0-dsi-touch-b
+          - waveshare,10.1-dsi-touch-a
+          - waveshare,10.1-dsi-touch-b
       - const: jadard,jd9365da-h3
 
   reg:

-- 
2.47.3

Re: [PATCH 03/19] dt-bindings: display/panel: jadard,jd9365da-h3: describe Waveshare panel

[Krzysztof Kozlowski]

On 01/04/2026 09:26, Dmitry Baryshkov wrote:
> Describe Waveshare DSI panels which use JD9365 as a panel controller.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  .../devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml       | 6 ++++++
>  1 file changed, 6 insertions(+)


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

[PATCH 04/19] dt-bindings: display/panel: ilitek,ili9881c: describe Waveshare panel

[Dmitry Baryshkov]

Describe Waveshare 7" DSI panel which uses ILI9881 as a panel
controller. This panel requires two voltags supplies, so add separate
iovcc supply.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
index d979701a00a8..42e35986fbf6 100644
--- a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
+++ b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
@@ -24,6 +24,7 @@ properties:
           - raspberrypi,dsi-7inch
           - startek,kd050hdfia020
           - tdo,tl050hdv35
+          - waveshare,7.0-dsi-touch-a
           - wanchanglong,w552946aaa
           - wanchanglong,w552946aba
       - const: ilitek,ili9881c
@@ -34,6 +35,7 @@ properties:
   backlight: true
   port: true
   power-supply: true
+  iovcc-supply: true
   reset-gpios: true
   rotation: true
 

-- 
2.47.3

Re: [PATCH 04/19] dt-bindings: display/panel: ilitek,ili9881c: describe Waveshare panel

[Krzysztof Kozlowski]

On Wed, Apr 01, 2026 at 10:26:23AM +0300, Dmitry Baryshkov wrote:
> Describe Waveshare 7" DSI panel which uses ILI9881 as a panel
> controller. This panel requires two voltags supplies, so add separate

typo, voltage supplies

> iovcc supply.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> index d979701a00a8..42e35986fbf6 100644
> --- a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> @@ -24,6 +24,7 @@ properties:
>            - raspberrypi,dsi-7inch
>            - startek,kd050hdfia020
>            - tdo,tl050hdv35
> +          - waveshare,7.0-dsi-touch-a
>            - wanchanglong,w552946aaa
>            - wanchanglong,w552946aba
>        - const: ilitek,ili9881c
> @@ -34,6 +35,7 @@ properties:
>    backlight: true
>    port: true
>    power-supply: true
> +  iovcc-supply: true
>    reset-gpios: true
>    rotation: true

Move the allOf to place before additional/unevaluatedProps and disallow
it for other variants.

Unless you assume that all other devices also could have iovcc, but then
please mention it in the commit msg.

Best regards,
Krzysztof

Re: [PATCH 04/19] dt-bindings: display/panel: ilitek,ili9881c: describe Waveshare panel

[Krzysztof Kozlowski]

On 01/04/2026 09:26, Dmitry Baryshkov wrote:
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> index d979701a00a8..42e35986fbf6 100644
> --- a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> @@ -24,6 +24,7 @@ properties:
>            - raspberrypi,dsi-7inch
>            - startek,kd050hdfia020
>            - tdo,tl050hdv35
> +          - waveshare,7.0-dsi-touch-a
>            - wanchanglong,w552946aaa

One more thing, this looks misplace/unsorted.

Best regards,
Krzysztof

[PATCH 05/19] dt-bindings: dipslay/panel: describe panels using Focaltech OTA7290B

[Dmitry Baryshkov]

Add schema for the panels using Focaltech OTA7290B controller. For now
there is only one such panel, from the Waveshare 8.8 DSI TOUCH-A kit.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 .../bindings/display/panel/focaltech,ota7290b.yaml | 70 ++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml b/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml
new file mode 100644
index 000000000000..da5237404dc5
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/focaltech,ota7290b.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Focaltech OTA7290B DSI panels
+
+maintainers:
+  - Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    - const: waveshare,8.88-dsi-touch-a
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: supply regulator for VDD, usually 3.3V
+
+  vdda-supply:
+    description: supply regulator for VDDA, 7-10V
+
+  vcc-supply:
+    description: supply regulator for VCCIO, usually 1.5V
+
+  reset-gpios: true
+  backlight: true
+  rotation: true
+  port: true
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - vccio-supply
+  - reset-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "waveshare,8.8-dsi-touch-a";
+            reg = <0>;
+            vdd-supply = <&vdd>;
+            vccio-supply = <&vccio>;
+            reset-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
+            backlight = <&backlight>;
+
+            port {
+                endpoint {
+                    remote-endpoint = <&mipi_out_panel>;
+                };
+            };
+        };
+    };
+
+...
+

-- 
2.47.3

Re: [PATCH 05/19] dt-bindings: dipslay/panel: describe panels using Focaltech OTA7290B

[Rob Herring (Arm)]

On Wed, 01 Apr 2026 10:26:24 +0300, Dmitry Baryshkov wrote:
> Add schema for the panels using Focaltech OTA7290B controller. For now
> there is only one such panel, from the Waveshare 8.8 DSI TOUCH-A kit.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  .../bindings/display/panel/focaltech,ota7290b.yaml | 70 ++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: ignoring, error in schema: properties: compatible
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.yaml: properties:compatible: [{'const': 'waveshare,8.88-dsi-touch-a'}] is not of type 'object', 'boolean'
Traceback (most recent call last):
  File "/usr/local/bin/dt-doc-validate", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/usr/local/lib/python3.13/dist-packages/dtschema/doc_validate.py", line 66, in main
    ret |= check_doc(f)
           ~~~~~~~~~^^^
  File "/usr/local/lib/python3.13/dist-packages/dtschema/doc_validate.py", line 37, in check_doc
    dtsch.check_schema_refs()
    ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/dist-packages/dtschema/schema.py", line 241, in check_schema_refs
    self._check_schema_refs(resolver, self)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/dtschema/schema.py", line 212, in _check_schema_refs
    self._check_schema_refs(resolver, v, parent=k, is_common=is_common,
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                            has_constraint=has_constraint)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/dtschema/schema.py", line 216, in _check_schema_refs
    self._check_schema_refs(resolver, schema[i], parent=parent, is_common=is_common,
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                            has_constraint=has_constraint)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/dtschema/schema.py", line 203, in _check_schema_refs
    ref_sch = resolver.lookup(schema['$ref']).contents
              ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/referencing/_core.py", line 682, in lookup
    retrieved = self._registry.get_or_retrieve(uri)
  File "/usr/local/lib/python3.13/dist-packages/referencing/_core.py", line 422, in get_or_retrieve
    registry = self.crawl()
  File "/usr/local/lib/python3.13/dist-packages/referencing/_core.py", line 500, in crawl
    id = resource.id()
  File "/usr/local/lib/python3.13/dist-packages/referencing/_core.py", line 231, in id
    id = self._specification.id_of(self.contents)
  File "/usr/local/lib/python3.13/dist-packages/referencing/jsonschema.py", line 50, in _dollar_id
    return contents.get("$id")
           ^^^^^^^^^^^^
AttributeError: 'list' object has no attribute 'get'
Documentation/devicetree/bindings/display/panel/focaltech,ota7290b.example.dtb: /example-0/dsi/panel@0: failed to match any schema with compatible: ['waveshare,8.8-dsi-touch-a']

doc reference errors (make refcheckdocs):

See https://patchwork.kernel.org/project/devicetree/patch/20260401-waveshare-dsi-touch-v1-5-5e9119b5a014@oss.qualcomm.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

[PATCH 06/19] drm/of: add helper to count data-lanes on a remote endpoint

[Dmitry Baryshkov]

If the DSI panel supports versatile lanes configuration, its driver
might require determining the number of DSI data lanes, which is usually
specified on the DSI host side of the OF graph. Add new helper as a
pair to drm_of_get_data_lanes_count_ep() that lets callers determine
number of data-lanes on the remote side of the OF graph.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/drm_of.c | 34 ++++++++++++++++++++++++++++++++++
 include/drm/drm_of.h     | 13 +++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 4f65ce729a47..ef6b09316963 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -558,6 +558,40 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port,
 }
 EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep);
 
+/**
+ * drm_of_get_data_lanes_count_remote - Get DSI/(e)DP data lane count by endpoint
+ * @port: DT port node of the DSI/(e)DP source or sink
+ * @port_reg: identifier (value of reg property) of the parent port node
+ * @reg: identifier (value of reg property) of the endpoint node
+ * @min: minimum supported number of data lanes
+ * @max: maximum supported number of data lanes
+ *
+ * Count DT "data-lanes" property elements in the remote endpoint and check for
+ * validity.  This variant uses endpoint specifier.
+ *
+ * Return:
+ * * min..max - positive integer count of "data-lanes" elements
+ * * -EINVAL - the "data-lanes" property is unsupported
+ * * -ENODEV - the "data-lanes" property is missing
+ */
+int drm_of_get_data_lanes_count_remote(const struct device_node *port,
+				       int port_reg, int reg,
+				       const unsigned int min,
+				       const unsigned int max)
+{
+	struct device_node *endpoint, *remote;
+	int ret;
+
+	endpoint = of_graph_get_endpoint_by_regs(port, port_reg, reg);
+	remote = of_graph_get_remote_endpoint(endpoint);
+	of_node_put(endpoint);
+	ret = drm_of_get_data_lanes_count(remote, min, max);
+	of_node_put(remote);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_remote);
+
 #if IS_ENABLED(CONFIG_DRM_MIPI_DSI)
 
 /**
diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
index f2f2bf82eff9..7bcc0ccfe0f4 100644
--- a/include/drm/drm_of.h
+++ b/include/drm/drm_of.h
@@ -62,6 +62,10 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port,
 				   int port_reg, int reg,
 				   const unsigned int min,
 				   const unsigned int max);
+int drm_of_get_data_lanes_count_remote(const struct device_node *port,
+				       int port_reg, int reg,
+				       const unsigned int min,
+				       const unsigned int max);
 #else
 static inline uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
 					  struct device_node *port)
@@ -140,6 +144,15 @@ drm_of_get_data_lanes_count_ep(const struct device_node *port,
 {
 	return -EINVAL;
 }
+
+static inline int
+drm_of_get_data_lanes_count_remote(const struct device_node *port,
+				   int port_reg, int reg,
+				   const unsigned int min,
+				   const unsigned int max)
+{
+	return -EINVAL;
+}
 #endif
 
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_MIPI_DSI)

-- 
2.47.3

[PATCH 07/19] drm/panel: himax-hx83102: support Waveshare 12.3" DSI panel

[Dmitry Baryshkov]

Add support for the Waveshare 12.3" DSI TOUCH-A panel. According to the
vendor driver, it uses different mode_flags, so let the panel
descriptions override driver-wide defaults.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-himax-hx83102.c | 144 +++++++++++++++++++++++++++-
 1 file changed, 142 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-himax-hx83102.c b/drivers/gpu/drm/panel/panel-himax-hx83102.c
index 8b2a68ee851e..eab67893da86 100644
--- a/drivers/gpu/drm/panel/panel-himax-hx83102.c
+++ b/drivers/gpu/drm/panel/panel-himax-hx83102.c
@@ -29,11 +29,14 @@
 #define HX83102_UNKNOWN_B8	0xb8
 #define HX83102_SETEXTC		0xb9
 #define HX83102_SETMIPI		0xba
+#define HX83102_UNKNOWN_BB	0xbb
 #define HX83102_SETVDC		0xbc
 #define HX83102_SETBANK		0xbd
 #define HX83102_UNKNOWN_BE	0xbe
 #define HX83102_SETPTBA		0xbf
 #define HX83102_SETSTBA		0xc0
+#define HX83102_UNKNOWN_C2	0xc2
+#define HX83102_UNKNOWN_C6	0xc6
 #define HX83102_SETTCON		0xc7
 #define HX83102_SETRAMDMY	0xc8
 #define HX83102_SETPWM		0xc9
@@ -78,6 +81,7 @@ struct hx83102_panel_desc {
 	} size;
 
 	bool has_backlight;
+	unsigned long mode_flags;
 
 	int (*init)(struct hx83102 *ctx);
 };
@@ -765,6 +769,111 @@ static int holitech_htf065h045_init(struct hx83102 *ctx)
 	return dsi_ctx.accum_err;
 }
 
+/* This is HX83102-E, assuming commands are the same as the normal HX83102 */
+static int waveshare_12_3_a_init(struct hx83102 *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETEXTC, 0x83, 0x10, 0x2e);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETSPCCMD, 0xcd);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_BB, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETSPCCMD, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETPCTRL, 0x67, 0x2c, 0xff, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_BE, 0x11, 0x96, 0x89);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_D9, 0x04, 0x03, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETPOWER,
+				     0x10, 0xfa, 0xaf, 0xaf, 0x33, 0x33, 0xb1, 0x4d, 0x2f, 0x36,
+				     0x36, 0x36, 0x36, 0x22, 0x21, 0x15, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETDISP,
+				     0x00, 0xd0, 0x27, 0x80, 0x00, 0x14, 0x40, 0x2c, 0x32, 0x02,
+				     0x00, 0x00, 0x15, 0x20, 0xd7, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETCYC,
+				     0x98, 0xa0, 0x01, 0x01, 0x98, 0xa0, 0x68, 0x50, 0x01, 0xc7,
+				     0x01, 0x58, 0x00, 0xff, 0x00, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_B6, 0x4d, 0x4d, 0xe3);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETPTBA, 0xfc, 0x85, 0x80);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_D2, 0x33, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP0,
+				     0x00, 0x00, 0x00, 0x00, 0x64, 0x04, 0x00, 0x08, 0x08, 0x27,
+				     0x27, 0x22, 0x2f, 0x15, 0x15, 0x04, 0x04, 0x32, 0x10, 0x13,
+				     0x00, 0x13, 0x32, 0x10, 0x1f, 0x00,
+				     0x02, 0x32, 0x17, 0xfd, 0x00, 0x10, 0x00, 0x00, 0x20,
+				     0x30, 0x01, 0x55, 0x21, 0x38, 0x01, 0x55, 0x0f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGMA,
+				     0x00, 0x0c, 0x1a, 0x23, 0x2b, 0x4f, 0x64, 0x69, 0x6c, 0x64,
+				     0x77, 0x77, 0x76, 0x80, 0x79, 0x7e, 0x85, 0x9a, 0x97, 0x4d,
+				     0x56, 0x64, 0x70, 0x00, 0x0c, 0x1a, 0x23, 0x2b, 0x4f, 0x64,
+				     0x69, 0x6c, 0x64, 0x77, 0x77, 0x76, 0x80, 0x79, 0x7e, 0x85,
+				     0x9a, 0x97, 0x4d, 0x56, 0x64, 0x76);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETPOWER, 0x01, 0x9b, 0x01, 0x31);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETCLOCK,
+				     0x80, 0x36, 0x12, 0x16, 0xc0, 0x28, 0x40, 0x84, 0x22);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP0,
+				     0x01, 0x00, 0xfc, 0x00, 0x00, 0x11, 0x10, 0x00, 0x0e, 0x00,
+				     0x01);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETCYC, 0x4e, 0x00, 0x33, 0x11, 0x33, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETPTBA, 0xf2, 0x00, 0x02);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETSTBA,
+				     0x23, 0x23, 0x22, 0x11, 0xa2, 0x17, 0x00, 0x80, 0x00, 0x00,
+				     0x08, 0x00, 0x63, 0x63);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_C6, 0xf9);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETTCON, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETRAMDMY,
+				     0x00, 0x04, 0x04, 0x00, 0x00, 0x82, 0x13, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETCASCADE, 0x07, 0x04, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP1,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x21, 0x20, 0x21, 0x20,
+				     0x01, 0x00, 0x03, 0x02, 0x05, 0x04, 0x07, 0x06, 0x1a, 0x1a,
+				     0x1a, 0x1a, 0x9a, 0x9a, 0x9a, 0x9a, 0x18, 0x18, 0x18, 0x18,
+				     0x21, 0x20, 0x21, 0x20, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP2,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x20, 0x21, 0x20, 0x21,
+				     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x1a, 0x1a,
+				     0x1a, 0x1a, 0x1a, 0x1a, 0x1a, 0x1a, 0x18, 0x18, 0x18, 0x18,
+				     0x20, 0x21, 0x20, 0x21, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98,
+				     0x98, 0x98, 0x98, 0x98);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETTP1,
+				     0x00, 0x34, 0x01, 0x88, 0x0e, 0xbe, 0x0f);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_UNKNOWN_C2, 0x43, 0xff, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETPANEL, 0x02);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETDISP, 0x80);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP3,
+				     0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+				     0xaa, 0xaa, 0xaa, 0x80, 0x2a, 0xaa, 0xaa, 0xaa, 0xaa, 0x80,
+				     0x2a, 0xaa, 0xaa, 0xaa);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP3,
+				     0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+				     0xaa, 0xaa);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETGIP3,
+				     0xff, 0xff, 0xff, 0xff,
+				     0xff, 0xf0, 0xff, 0xff,
+				     0xff, 0xff, 0xff, 0xf0);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83102_SETBANK, 0x00);
+
+	return dsi_ctx.accum_err;
+};
+
 static const struct drm_display_mode starry_mode = {
 	.clock = 162680,
 	.hdisplay = 1200,
@@ -920,6 +1029,30 @@ static const struct hx83102_panel_desc holitech_htf065h045_desc = {
 	.init = holitech_htf065h045_init,
 };
 
+static const struct drm_display_mode waveshare_12_3_a_mode = {
+	.clock = 95000,
+	.hdisplay = 720,
+	.hsync_start = 720 + 10,
+	.hsync_end = 720 + 10 + 10,
+	.htotal = 720 + 10 + 10 + 12,
+	.vdisplay = 1920,
+	.vsync_start = 1920 + 64,
+	.vsync_end = 1920 + 64 + 18,
+	.vtotal = 1920 + 64 + 18 + 4,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static const struct hx83102_panel_desc waveshare_12_3_inch_a_desc = {
+	.modes = &waveshare_12_3_a_mode,
+	.size = {
+		.width_mm = 109,
+		.height_mm = 292,
+	},
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+	.init = waveshare_12_3_a_init,
+};
+
 static int hx83102_enable(struct drm_panel *panel)
 {
 	msleep(130);
@@ -1168,8 +1301,12 @@ static int hx83102_probe(struct mipi_dsi_device *dsi)
 	desc = of_device_get_match_data(&dsi->dev);
 	dsi->lanes = 4;
 	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
-					  MIPI_DSI_MODE_LPM;
+	if (desc->mode_flags)
+		dsi->mode_flags = desc->mode_flags;
+	else
+		dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+			MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+			MIPI_DSI_MODE_LPM;
 	ctx->desc = desc;
 	ctx->dsi = dsi;
 	ret = hx83102_panel_add(ctx);
@@ -1220,6 +1357,9 @@ static const struct of_device_id hx83102_of_match[] = {
 	{ .compatible = "holitech,htf065h045",
 	  .data = &holitech_htf065h045_desc
 	},
+	{ .compatible = "waveshare,12.3-dsi-touch-a",
+	  .data = &waveshare_12_3_inch_a_desc
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, hx83102_of_match);

-- 
2.47.3

Re: [PATCH 07/19] drm/panel: himax-hx83102: support Waveshare 12.3" DSI panel

[Linus Walleij]

Hi Dmitry,

thanks for your patch!

On Wed, Apr 1, 2026 at 9:26 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Add support for the Waveshare 12.3" DSI TOUCH-A panel. According to the
> vendor driver, it uses different mode_flags, so let the panel
> descriptions override driver-wide defaults.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
(...)
> +#define HX83102_UNKNOWN_BB     0xbb
(...)
> +#define HX83102_UNKNOWN_C2     0xc2
> +#define HX83102_UNKNOWN_C6     0xc6

What I am unable to fathom is why Qualcomm, a fortune 500 company, would be
unable to muscle out the datasheet for this display controller from
the panel vendor
and provide some proper names for these defines.

Could you try to ask Waveshare to just share the datasheet so you can say
what is going on here.

If we have too many *UNKNOWN_NN" it will get hard to see of the same code
can be introduced and refactored into other inits without risk of breaking
something is my thinking here.

If it's like ... really hard for you to achieve this I guess I will
grumpily accept it
but it'd be nice if you try sending the message that we want to know what these
things are.

Yours,
Linus Walleij

[PATCH 08/19] drm/panel: himax-hx8394: set prepare_prev_first

[Dmitry Baryshkov]

Sending DSI commands from the prepare() callback requires DSI link to be
up at that point. For DSI hosts is guaranteed only if the panel driver
sets the .prepare_prev_first flag. Set it to let these panels work with
the DSI hosts which don't power on the link in their .mode_set callback.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-himax-hx8394.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-himax-hx8394.c b/drivers/gpu/drm/panel/panel-himax-hx8394.c
index c4d3e09a228d..d64f3521eb15 100644
--- a/drivers/gpu/drm/panel/panel-himax-hx8394.c
+++ b/drivers/gpu/drm/panel/panel-himax-hx8394.c
@@ -792,6 +792,8 @@ static int hx8394_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
+	ctx->panel.prepare_prev_first = true;
+
 	drm_panel_add(&ctx->panel);
 
 	ret = mipi_dsi_attach(dsi);

-- 
2.47.3

Re: [PATCH 08/19] drm/panel: himax-hx8394: set prepare_prev_first

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Sending DSI commands from the prepare() callback requires DSI link to be
> up at that point. For DSI hosts is guaranteed only if the panel driver
> sets the .prepare_prev_first flag. Set it to let these panels work with
> the DSI hosts which don't power on the link in their .mode_set callback.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

[PATCH 09/19] drm/panel: himax-hx8394: simplify hx8394_enable()

[Dmitry Baryshkov]

Simplify hx8394_enable() function by using hx8394_disable() instead of
open-coding it and mipi_dsi_msleep() instead of manual checks.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-himax-hx8394.c | 41 ++++++++++--------------------
 1 file changed, 14 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-himax-hx8394.c b/drivers/gpu/drm/panel/panel-himax-hx8394.c
index d64f3521eb15..1f23c50b6661 100644
--- a/drivers/gpu/drm/panel/panel-himax-hx8394.c
+++ b/drivers/gpu/drm/panel/panel-himax-hx8394.c
@@ -618,47 +618,34 @@ static const struct hx8394_panel_desc hl055fhav028c_desc = {
 	.init_sequence = hl055fhav028c_init_sequence,
 };
 
-static int hx8394_enable(struct drm_panel *panel)
+static int hx8394_disable(struct drm_panel *panel)
 {
 	struct hx8394 *ctx = panel_to_hx8394(panel);
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
-	int ret;
-
-	ctx->desc->init_sequence(&dsi_ctx);
-
-	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
-
-	if (dsi_ctx.accum_err)
-		return dsi_ctx.accum_err;
-	/* Panel is operational 120 msec after reset */
-	msleep(120);
-
-	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
-	if (dsi_ctx.accum_err)
-		goto sleep_in;
-
-	return 0;
-
-sleep_in:
-	ret = dsi_ctx.accum_err;
-	dsi_ctx.accum_err = 0;
 
-	/* This will probably fail, but let's try orderly power off anyway. */
 	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
-	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_msleep(&dsi_ctx, 50); /* about 3 frames */
 
-	return ret;
+	return dsi_ctx.accum_err;
 }
 
-static int hx8394_disable(struct drm_panel *panel)
+static int hx8394_enable(struct drm_panel *panel)
 {
 	struct hx8394 *ctx = panel_to_hx8394(panel);
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
 
-	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
-	mipi_dsi_msleep(&dsi_ctx, 50); /* about 3 frames */
+	ctx->desc->init_sequence(&dsi_ctx);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	/* Panel is operational 120 msec after reset */
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	if (dsi_ctx.accum_err)
+		hx8394_disable(panel);
 
 	return dsi_ctx.accum_err;
 }

-- 
2.47.3

Re: [PATCH 09/19] drm/panel: himax-hx8394: simplify hx8394_enable()

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Simplify hx8394_enable() function by using hx8394_disable() instead of
> open-coding it and mipi_dsi_msleep() instead of manual checks.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Excellent, thanks!
Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

[PATCH 10/19] drm/panel: himax-hx8394: support Waveshare DSI panels

[Dmitry Baryshkov]

Enable support for Waveshare 5.0" and 5.5" DSI TOUCH-A panels.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-himax-hx8394.c | 244 +++++++++++++++++++++++++++++
 1 file changed, 244 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-himax-hx8394.c b/drivers/gpu/drm/panel/panel-himax-hx8394.c
index 1f23c50b6661..bf80354567df 100644
--- a/drivers/gpu/drm/panel/panel-himax-hx8394.c
+++ b/drivers/gpu/drm/panel/panel-himax-hx8394.c
@@ -44,6 +44,7 @@
 #define HX8394_CMD_SETID	  0xc3
 #define HX8394_CMD_SETDDB	  0xc4
 #define HX8394_CMD_UNKNOWN2	  0xc6
+#define HX8394_CMD_UNKNOWN6	  0xc7
 #define HX8394_CMD_SETCABC	  0xc9
 #define HX8394_CMD_SETCABCGAIN	  0xca
 #define HX8394_CMD_SETPANEL	  0xcc
@@ -618,6 +619,247 @@ static const struct hx8394_panel_desc hl055fhav028c_desc = {
 	.init_sequence = hl055fhav028c_init_sequence,
 };
 
+static void waveshare_5_0_inch_a_init_sequence(struct mipi_dsi_multi_context *dsi_ctx)
+{
+	/* 5.19.8 SETEXTC: Set extension command (B9h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETEXTC,
+				     0xff, 0x83, 0x94);
+
+	/* 5.19.2 SETPOWER: Set power (B1h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETPOWER,
+				     0x48, 0x0a, 0x6a, 0x09, 0x33, 0x54, 0x71, 0x71, 0x2e, 0x45);
+
+	/* 5.19.9 SETMIPI: Set MIPI control (BAh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETMIPI,
+				     0x61, 0x03, 0x68, 0x6b, 0xb2, 0xc0);
+
+	/* 5.19.3 SETDISP: Set display related register (B2h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETDISP,
+				     0x00, 0x80, 0x64, 0x0c, 0x06, 0x2f);
+
+	/* 5.19.4 SETCYC: Set display waveform cycles (B4h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETCYC,
+				     0x1c, 0x78, 0x1c, 0x78, 0x1c, 0x78, 0x01, 0x0c, 0x86, 0x75,
+				     0x00, 0x3f, 0x1c, 0x78, 0x1c, 0x78, 0x1c, 0x78, 0x01, 0x0c,
+				     0x86);
+
+	/* 5.19.19 SETGIP0: Set GIP Option0 (D3h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGIP0,
+				     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x32, 0x10,
+				     0x05, 0x00, 0x05, 0x32, 0x13, 0xc1, 0x00, 0x01, 0x32, 0x10,
+				     0x08, 0x00, 0x00, 0x37, 0x03, 0x07, 0x07, 0x37, 0x05, 0x05,
+				     0x37, 0x0c, 0x40);
+
+	/* 5.19.20 Set GIP Option1 (D5h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGIP1,
+				     0x18, 0x18, 0x18, 0x18, 0x22, 0x23, 0x20, 0x21, 0x04, 0x05,
+				     0x06, 0x07, 0x00, 0x01, 0x02, 0x03, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x19, 0x19, 0x19, 0x19);
+
+	/* 5.19.21 Set GIP Option2 (D6h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGIP2,
+				     0x18, 0x18, 0x19, 0x19, 0x21, 0x20, 0x23, 0x22, 0x03, 0x02,
+				     0x01, 0x00, 0x07, 0x06, 0x05, 0x04, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x19, 0x19, 0x18, 0x18);
+
+	/* 5.19.25 SETGAMMA: Set gamma curve related setting (E0h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGAMMA,
+				     0x07, 0x08, 0x09, 0x0d, 0x10, 0x14, 0x16, 0x13, 0x24, 0x36,
+				     0x48, 0x4a, 0x58, 0x6f, 0x76, 0x80, 0x97, 0xa5, 0xa8, 0xb5,
+				     0xc6, 0x62, 0x63, 0x68, 0x6f, 0x72, 0x78, 0x7f, 0x7f, 0x00,
+				     0x02, 0x08, 0x0d, 0x0c, 0x0e, 0x0f, 0x10, 0x24, 0x36, 0x48,
+				     0x4a, 0x58, 0x6f, 0x78, 0x82, 0x99, 0xa4, 0xa0, 0xb1, 0xc0,
+				     0x5e, 0x5e, 0x64, 0x6b, 0x6c, 0x73, 0x7f, 0x7f);
+
+	/* 5.19.17 SETPANEL (CCh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETPANEL,
+				     0x0b);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN1,
+				     0x1f, 0x73);
+
+	/* 5.19.5 SETVCOM: Set VCOM voltage (B6h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETVCOM,
+				     0x6b, 0x6b);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN3,
+				     0x02);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETREGBANK,
+				     0x01);
+
+	/* 5.19.2 SETPOWER: Set power (B1h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETPOWER,
+				     0x00);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETREGBANK,
+				     0x00);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN5,
+				     0x40, 0x81, 0x50, 0x00, 0x1a, 0xfc, 0x01);
+};
+
+static const struct drm_display_mode waveshare_5_0_inch_a_mode = {
+	.clock = 70000,
+	.hdisplay = 720,
+	.hsync_start = 720 + 40,
+	.hsync_end = 720 + 40 + 20,
+	.htotal = 720 + 40 + 20 + 20,
+	.vdisplay = 1280,
+	.vsync_start = 1280 + 30,
+	.vsync_end = 1280 + 30 + 10,
+	.vtotal = 1280 + 30 + 10 + 4,
+	.width_mm = 62,
+	.height_mm = 110,
+};
+
+static const struct hx8394_panel_desc waveshare_5_0_inch_a_desc = {
+	.mode = &waveshare_5_0_inch_a_mode,
+	.lanes = 2,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init_sequence = waveshare_5_0_inch_a_init_sequence,
+};
+
+static const struct drm_display_mode waveshare_5_5_inch_a_mode = {
+	.clock = 65000,
+	.hdisplay = 720,
+	.hsync_start = 720 + 50,
+	.hsync_end = 720 + 50 + 50,
+	.htotal = 720 + 50 + 50 + 10,
+	.vdisplay = 1280,
+	.vsync_start = 1280 + 15,
+	.vsync_end = 1280 + 15 + 12,
+	.vtotal = 1280 + 15 + 12 + 4,
+	.width_mm = 62,
+	.height_mm = 110,
+};
+
+static void waveshare_5_5_inch_a_init_sequence(struct mipi_dsi_multi_context *dsi_ctx)
+{
+	/* 5.19.8 SETEXTC: Set extension command (B9h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETEXTC,
+				     0xff, 0x83, 0x94);
+
+	/* 5.19.9 SETMIPI: Set MIPI control (BAh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETMIPI,
+				     0x61, 0x03, 0x68, 0x6b, 0xb2, 0xc0);
+
+	/* 5.19.2 SETPOWER: Set power (B1h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETPOWER,
+				     0x48, 0x12, 0x72, 0x09, 0x32, 0x54, 0x71, 0x71, 0x57, 0x47);
+
+	/* 5.19.3 SETDISP: Set display related register (B2h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETDISP,
+				     0x00, 0x80, 0x64, 0x0c, 0x0d, 0x2f);
+
+	/* 5.19.4 SETCYC: Set display waveform cycles (B4h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETCYC,
+				     0x73, 0x74, 0x73, 0x74, 0x73, 0x74, 0x01, 0x0c, 0x86, 0x75,
+				     0x00, 0x3f, 0x73, 0x74, 0x73, 0x74, 0x73, 0x74, 0x01, 0x0c,
+				     0x86);
+
+	/* 5.19.5 SETVCOM: Set VCOM voltage (B6h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETVCOM,
+				     0x86, 0x86);
+
+	/* 5.19.19 SETGIP0: Set GIP Option0 (D3h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGIP0,
+				     0x00, 0x00, 0x07, 0x07, 0x40, 0x07, 0x0c, 0x00, 0x08, 0x10,
+				     0x08, 0x00, 0x08, 0x54, 0x15, 0x0a, 0x05, 0x0a, 0x02, 0x15,
+				     0x06, 0x05, 0x06, 0x47, 0x44, 0x0a, 0x0a, 0x4b, 0x10, 0x07,
+				     0x07, 0x0c, 0x40);
+
+	/* 5.19.20 Set GIP Option1 (D5h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGIP1,
+				     0x1c, 0x1c, 0x1d, 0x1d, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
+				     0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x24, 0x25, 0x18, 0x18,
+				     0x26, 0x27, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x20, 0x21,
+				     0x18, 0x18, 0x18, 0x18);
+
+	/* 5.19.21 Set GIP Option2 (D6h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGIP2,
+				     0x1c, 0x1c, 0x1d, 0x1d, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02,
+				     0x01, 0x00, 0x0b, 0x0a, 0x09, 0x08, 0x21, 0x20, 0x18, 0x18,
+				     0x27, 0x26, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+				     0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x25, 0x24,
+				     0x18, 0x18, 0x18, 0x18);
+
+	/* 5.19.25 SETGAMMA: Set gamma curve related setting (E0h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETGAMMA,
+				     0x00, 0x13, 0x21, 0x28, 0x2b, 0x2e, 0x32, 0x2f, 0x61, 0x6e,
+				     0x7e, 0x7b, 0x80, 0x8f, 0x91, 0x93, 0x9d, 0x9d, 0x97, 0xa4,
+				     0xb1, 0x57, 0x55, 0x58, 0x5d, 0x60, 0x67, 0x74, 0x7f, 0x00,
+				     0x13, 0x21, 0x28, 0x2b, 0x2e, 0x32, 0x2f, 0x61, 0x6e, 0x7d,
+				     0x7b, 0x7f, 0x8e, 0x90, 0x93, 0x9c, 0x9d, 0x98, 0xa4, 0xb1,
+				     0x58, 0x55, 0x59, 0x5e, 0x61, 0x68, 0x76, 0x7f);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN1,
+				     0x1f, 0x31);
+
+	/* 5.19.17 SETPANEL (CCh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETPANEL,
+				     0x07);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN3,
+				     0x02);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETREGBANK,
+				     0x02);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN4,
+				     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+				     0xff, 0xff);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETREGBANK,
+				     0x00);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETREGBANK,
+				     0x01);
+
+	/* 5.19.2 SETPOWER: Set power (B1h) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETPOWER,
+				     0x00);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_SETREGBANK,
+				     0x00);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN2,
+				     0xed);
+
+	/* Unknown command, not listed in the HX8394-F datasheet */
+	mipi_dsi_dcs_write_seq_multi(dsi_ctx, HX8394_CMD_UNKNOWN6,
+				     0x00, 0xc0);
+};
+
+static const struct hx8394_panel_desc waveshare_5_5_inch_a_desc = {
+	.mode = &waveshare_5_5_inch_a_mode,
+	.lanes = 2,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init_sequence = waveshare_5_5_inch_a_init_sequence,
+};
+
 static int hx8394_disable(struct drm_panel *panel)
 {
 	struct hx8394 *ctx = panel_to_hx8394(panel);
@@ -815,6 +1057,8 @@ static const struct of_device_id hx8394_of_match[] = {
 	{ .compatible = "huiling,hl055fhav028c", .data = &hl055fhav028c_desc },
 	{ .compatible = "powkiddy,x55-panel", .data = &powkiddy_x55_desc },
 	{ .compatible = "microchip,ac40t08a-mipi-panel", .data = &mchp_ac40t08a_desc },
+	{ .compatible = "waveshare,5.0-dsi-touch-a", .data = &waveshare_5_0_inch_a_desc },
+	{ .compatible = "waveshare,5.5-dsi-touch-a", .data = &waveshare_5_5_inch_a_desc },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, hx8394_of_match);

-- 
2.47.3

Re: [PATCH 10/19] drm/panel: himax-hx8394: support Waveshare DSI panels

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Enable support for Waveshare 5.0" and 5.5" DSI TOUCH-A panels.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

This looks excellent, good documentation and references to (incomplete...)
datasheet. Maybe this datasheet has the defs I was complaining about
in the other patch?
Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

Re: [PATCH 10/19] drm/panel: himax-hx8394: support Waveshare DSI panels

[Dmitry Baryshkov]

On Wed, Apr 08, 2026 at 10:10:13AM +0200, Linus Walleij wrote:
> On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
> <dmitry.baryshkov@oss.qualcomm.com> wrote:
> 
> > Enable support for Waveshare 5.0" and 5.5" DSI TOUCH-A panels.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> 
> This looks excellent, good documentation and references to (incomplete...)
> datasheet. Maybe this datasheet has the defs I was complaining about
> in the other patch?

No :-(

> Reviewed-by: Linus Walleij <linusw@kernel.org>
> 
> Yours,
> Linus Walleij

-- 
With best wishes
Dmitry

[PATCH 11/19] drm/panel: jadard-jd9365da-h3: use drm_connector_helper_get_modes_fixed

[Dmitry Baryshkov]

Use existing helper instead of manually coding it.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/Kconfig                    |  1 +
 drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c | 19 ++-----------------
 2 files changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index d6863b28ddc5..ba527b4d7737 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -337,6 +337,7 @@ config DRM_PANEL_JADARD_JD9365DA_H3
 	depends on OF
 	depends on DRM_MIPI_DSI
 	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_KMS_HELPER
 	help
 	  Say Y here if you want to enable support for Jadard JD9365DA-H3
 	  WXGA MIPI DSI panel. The panel support TFT dot matrix LCD with
diff --git a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
index c33c611e03c0..1884ad2404cd 100644
--- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
+++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
@@ -12,6 +12,7 @@
 #include <drm/drm_modes.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
 
 #include <linux/gpio/consumer.h>
 #include <linux/delay.h>
@@ -149,24 +150,8 @@ static int jadard_get_modes(struct drm_panel *panel,
 			    struct drm_connector *connector)
 {
 	struct jadard *jadard = panel_to_jadard(panel);
-	const struct drm_display_mode *desc_mode = &jadard->desc->mode;
-	struct drm_display_mode *mode;
-
-	mode = drm_mode_duplicate(connector->dev, desc_mode);
-	if (!mode) {
-		DRM_DEV_ERROR(&jadard->dsi->dev, "failed to add mode %ux%ux@%u\n",
-			      desc_mode->hdisplay, desc_mode->vdisplay,
-			      drm_mode_vrefresh(desc_mode));
-		return -ENOMEM;
-	}
-
-	drm_mode_set_name(mode);
-	drm_mode_probed_add(connector, mode);
-
-	connector->display_info.width_mm = mode->width_mm;
-	connector->display_info.height_mm = mode->height_mm;
 
-	return 1;
+	return drm_connector_helper_get_modes_fixed(connector, &jadard->desc->mode);
 }
 
 static enum drm_panel_orientation jadard_panel_get_orientation(struct drm_panel *panel)

-- 
2.47.3

Re: [PATCH 11/19] drm/panel: jadard-jd9365da-h3: use drm_connector_helper_get_modes_fixed

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Use existing helper instead of manually coding it.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

[PATCH 12/19] drm/panel: jadard-jd9365da-h3: support variable DSI configuration

[Dmitry Baryshkov]

Several panels support attachment either using 4 DSI lanes or just 2. In
some cases, this requires a different panel mode to fulfill clock
requirements. Extend the driver to handle such cases by letting the
panel description to omit lanes specification and parsing number of
lanes from the DT.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c | 32 +++++++++++++++++-------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
index 1884ad2404cd..5d9db2e1f28f 100644
--- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
+++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
@@ -10,6 +10,7 @@
 
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_modes.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
@@ -23,7 +24,8 @@
 struct jadard;
 
 struct jadard_panel_desc {
-	const struct drm_display_mode mode;
+	const struct drm_display_mode *mode_4ln;
+	const struct drm_display_mode *mode_2ln;
 	unsigned int lanes;
 	enum mipi_dsi_pixel_format format;
 	int (*init)(struct jadard *jadard);
@@ -57,7 +59,10 @@ static void jadard_enable_standard_cmds(struct mipi_dsi_multi_context *dsi_ctx)
 	mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0xe1, 0x93);
 	mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0xe2, 0x65);
 	mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0xe3, 0xf8);
-	mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x03);
+	if (dsi_ctx->dsi->lanes == 2)
+		mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x01);
+	else
+		mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x03);
 }
 
 static inline struct jadard *panel_to_jadard(struct drm_panel *panel)
@@ -151,7 +156,10 @@ static int jadard_get_modes(struct drm_panel *panel,
 {
 	struct jadard *jadard = panel_to_jadard(panel);
 
-	return drm_connector_helper_get_modes_fixed(connector, &jadard->desc->mode);
+	if (jadard->dsi->lanes == 2)
+		return drm_connector_helper_get_modes_fixed(connector, jadard->desc->mode_2ln);
+	else
+		return drm_connector_helper_get_modes_fixed(connector, jadard->desc->mode_4ln);
 }
 
 static enum drm_panel_orientation jadard_panel_get_orientation(struct drm_panel *panel)
@@ -354,7 +362,7 @@ static int radxa_display_8hd_ad002_init_cmds(struct jadard *jadard)
 };
 
 static const struct jadard_panel_desc radxa_display_8hd_ad002_desc = {
-	.mode = {
+	.mode_4ln = &(const struct drm_display_mode) {
 		.clock		= 70000,
 
 		.hdisplay	= 800,
@@ -586,7 +594,7 @@ static int cz101b4001_init_cmds(struct jadard *jadard)
 };
 
 static const struct jadard_panel_desc cz101b4001_desc = {
-	.mode = {
+	.mode_4ln = &(const struct drm_display_mode) {
 		.clock		= 70000,
 
 		.hdisplay	= 800,
@@ -819,7 +827,7 @@ static int kingdisplay_kd101ne3_init_cmds(struct jadard *jadard)
 };
 
 static const struct jadard_panel_desc kingdisplay_kd101ne3_40ti_desc = {
-	.mode = {
+	.mode_4ln = &(const struct drm_display_mode) {
 		.clock		= (800 + 24 + 24 + 24) * (1280 + 30 + 4 + 8) * 60 / 1000,
 
 		.hdisplay	= 800,
@@ -1070,7 +1078,7 @@ static int melfas_lmfbx101117480_init_cmds(struct jadard *jadard)
 };
 
 static const struct jadard_panel_desc melfas_lmfbx101117480_desc = {
-	.mode = {
+	.mode_4ln = &(const struct drm_display_mode) {
 		.clock		= (800 + 24 + 24 + 24) * (1280 + 30 + 4 + 8) * 60 / 1000,
 
 		.hdisplay	= 800,
@@ -1326,7 +1334,7 @@ static int anbernic_rgds_init_cmds(struct jadard *jadard)
 };
 
 static const struct jadard_panel_desc anbernic_rgds_display_desc = {
-	.mode = {
+	.mode_4ln = &(const struct drm_display_mode) {
 		.clock		= (640 + 260 + 220 + 260) * (480 + 10 + 2 + 16) * 60 / 1000,
 
 		.hdisplay	= 640,
@@ -1562,7 +1570,7 @@ static int taiguan_xti05101_01a_init_cmds(struct jadard *jadard)
 };
 
 static const struct jadard_panel_desc taiguan_xti05101_01a_desc = {
-	.mode = {
+	.mode_4ln = &(const struct drm_display_mode) {
 		.clock		= (800 + 24 + 24 + 24) * (1280 + 30 + 4 + 8) * 60 / 1000,
 
 		.hdisplay	= 800,
@@ -1614,6 +1622,12 @@ static int jadard_dsi_probe(struct mipi_dsi_device *dsi)
 
 	dsi->format = desc->format;
 	dsi->lanes = desc->lanes;
+	if (!dsi->lanes) {
+		dsi->lanes = drm_of_get_data_lanes_count_remote(dsi->dev.of_node, 0, -1, 2, 4);
+		if (dsi->lanes < 0)
+			return dsi->lanes;
+	}
+	dev_dbg(&dsi->dev, "lanes: %d\n", dsi->lanes);
 
 	jadard->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(jadard->reset))

-- 
2.47.3

Re: [PATCH 12/19] drm/panel: jadard-jd9365da-h3: support variable DSI configuration

[Riccardo Mereu]

On Wed, 01 Apr 2026 10:26:31 +0300 Dmitry Baryshkov wrote:
>From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
>Several panels support attachment either using 4 DSI lanes or just 2. In
>some cases, this requires a different panel mode to fulfill clock
>requirements. Extend the driver to handle such cases by letting the
>panel description to omit lanes specification and parsing number of
>lanes from the DT.
>
>Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Tested-by: Riccardo Mereu <r.mereu@arduino.cc>

Re: [PATCH 12/19] drm/panel: jadard-jd9365da-h3: support variable DSI configuration

[Linus Walleij]

Hi Dmitry,

thanks for your patch!

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Several panels support attachment either using 4 DSI lanes or just 2. In
> some cases, this requires a different panel mode to fulfill clock
> requirements. Extend the driver to handle such cases by letting the
> panel description to omit lanes specification and parsing number of
> lanes from the DT.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
(...)

> +       if (dsi_ctx->dsi->lanes == 2)
> +               mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x01);
> +       else
> +               mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x03);

If lanes 2 we do unexplicable magic A else we do unexplicable magic B?

Do we know more about what is actually going on here?

Can you check the datasheet?

The patch is nice anyway and no big deal so, so +/- that fixup:
Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

Re: [PATCH 12/19] drm/panel: jadard-jd9365da-h3: support variable DSI configuration

[Dmitry Baryshkov]

On Wed, Apr 08, 2026 at 10:15:13AM +0200, Linus Walleij wrote:
> Hi Dmitry,
> 
> thanks for your patch!
> 
> On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
> <dmitry.baryshkov@oss.qualcomm.com> wrote:
> 
> > Several panels support attachment either using 4 DSI lanes or just 2. In
> > some cases, this requires a different panel mode to fulfill clock
> > requirements. Extend the driver to handle such cases by letting the
> > panel description to omit lanes specification and parsing number of
> > lanes from the DT.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> (...)
> 
> > +       if (dsi_ctx->dsi->lanes == 2)
> > +               mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x01);
> > +       else
> > +               mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x80, 0x03);
> 
> If lanes 2 we do unexplicable magic A else we do unexplicable magic B?
> 
> Do we know more about what is actually going on here?
> 
> Can you check the datasheet?

The datasheet (you can find it) is pretty useless here. Unfortunately I
don't have a second source of information. As far as I know, this
value maps directly to the number of lanes and nothing else.

> 
> The patch is nice anyway and no big deal so, so +/- that fixup:
> Reviewed-by: Linus Walleij <linusw@kernel.org>
> 
> Yours,
> Linus Walleij

-- 
With best wishes
Dmitry

[PATCH 13/19] drm/panel: jadard-jd9365da-h3: set prepare_prev_first

[Dmitry Baryshkov]

Sending DSI commands from the prepare() callback requires DSI link to be
up at that point. For DSI hosts is guaranteed only if the panel driver
sets the .prepare_prev_first flag. Set it to let these panels work with
the DSI hosts which don't power on the link in their .mode_set callback.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
index 5d9db2e1f28f..11b7e07c1af8 100644
--- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
+++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
@@ -1652,6 +1652,8 @@ static int jadard_dsi_probe(struct mipi_dsi_device *dsi)
 	if (ret)
 		return ret;
 
+	jadard->panel.prepare_prev_first = true;
+
 	drm_panel_add(&jadard->panel);
 
 	mipi_dsi_set_drvdata(dsi, jadard);

-- 
2.47.3

Re: [PATCH 13/19] drm/panel: jadard-jd9365da-h3: set prepare_prev_first

[Riccardo Mereu]

On Wed, 01 Apr 2026 10:26:32 +0300 Dmitry Baryshkov wrote:
>From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
>Sending DSI commands from the prepare() callback requires DSI link to be
>up at that point. For DSI hosts is guaranteed only if the panel driver
>sets the .prepare_prev_first flag. Set it to let these panels work with
>the DSI hosts which don't power on the link in their .mode_set callback.
>
>Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Tested-by: Riccardo Mereu <r.mereu@arduino.cc>

Re: [PATCH 13/19] drm/panel: jadard-jd9365da-h3: set prepare_prev_first

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Sending DSI commands from the prepare() callback requires DSI link to be
> up at that point. For DSI hosts is guaranteed only if the panel driver
> sets the .prepare_prev_first flag. Set it to let these panels work with
> the DSI hosts which don't power on the link in their .mode_set callback.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

[PATCH 14/19] drm/panel: jadard-jd9365da-h3: support Waveshare DSI panels

[Dmitry Baryshkov]

Add configuration for Waveshare DSI panels using JD9365 controller.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c | 1524 ++++++++++++++++++++--
 1 file changed, 1440 insertions(+), 84 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
index 11b7e07c1af8..e9a461239301 100644
--- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
+++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
@@ -21,6 +21,8 @@
 #include <linux/of.h>
 #include <linux/regulator/consumer.h>
 
+#include <video/mipi_display.h>
+
 struct jadard;
 
 struct jadard_panel_desc {
@@ -1599,115 +1601,1469 @@ static const struct jadard_panel_desc taiguan_xti05101_01a_desc = {
 	.enter_sleep_to_reset_down_delay_ms = 100,
 };
 
-static int jadard_dsi_probe(struct mipi_dsi_device *dsi)
+static int waveshare_3_4_c_init(struct jadard *jadard)
 {
-	struct device *dev = &dsi->dev;
-	const struct jadard_panel_desc *desc;
-	struct jadard *jadard;
-	int ret;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = jadard->dsi };
 
-	jadard = devm_drm_panel_alloc(dev, struct jadard, panel, &jadard_funcs,
-				      DRM_MODE_CONNECTOR_DSI);
-	if (IS_ERR(jadard))
-		return PTR_ERR(jadard);
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	jadard_enable_standard_cmds(&dsi_ctx);
 
-	desc = of_device_get_match_data(dev);
+	jd9365da_switch_page(&dsi_ctx, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0xd0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0xd0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0xfe);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x26);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x78);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0x64);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0xc7);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x18);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x14);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x1b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x16);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x2f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x32);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x53);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x4c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x31);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x20);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x0f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x70, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x73, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x16);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x2f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x32);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x53);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7c, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x4c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x80, 0x31);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x81, 0x20);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x82, 0x0f);
 
-	if (desc->mode_flags)
-		dsi->mode_flags = desc->mode_flags;
-	else
-		dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
-				  MIPI_DSI_MODE_VIDEO_BURST |
-				  MIPI_DSI_MODE_NO_EOT_PACKET;
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x05, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x06, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x07, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x08, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0a, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0b, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0d, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0f, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x10, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x11, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x12, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x13, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x14, 0x42);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x16, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1e, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1f, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x20, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x21, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x22, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x23, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x25, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x26, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x27, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x28, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x29, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2a, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2c, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2d, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2e, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2f, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x30, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x31, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x32, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x33, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x34, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x36, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x46, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x47, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x48, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x49, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4a, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4b, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4c, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4d, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4e, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4f, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x50, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x51, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x52, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x53, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x54, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x56, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x1f);
 
-	dsi->format = desc->format;
-	dsi->lanes = desc->lanes;
-	if (!dsi->lanes) {
-		dsi->lanes = drm_of_get_data_lanes_count_remote(dsi->dev.of_node, 0, -1, 2, 4);
-		if (dsi->lanes < 0)
-			return dsi->lanes;
-	}
-	dev_dbg(&dsi->dev, "lanes: %d\n", dsi->lanes);
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x58, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5c, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0xa6);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x73);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0xd9);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x43);
 
-	jadard->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(jadard->reset))
-		return dev_err_probe(&dsi->dev, PTR_ERR(jadard->reset),
-				"failed to get our reset GPIO\n");
+	jd9365da_switch_page(&dsi_ctx, 0x00);
 
-	jadard->vdd = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(jadard->vdd))
-		return dev_err_probe(&dsi->dev, PTR_ERR(jadard->vdd),
-				"failed to get vdd regulator\n");
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	msleep(120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	msleep(5);
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
 
-	jadard->vccio = devm_regulator_get(dev, "vccio");
-	if (IS_ERR(jadard->vccio))
-		return dev_err_probe(&dsi->dev, PTR_ERR(jadard->vccio),
-				"failed to get vccio regulator\n");
+	return dsi_ctx.accum_err;
+}
 
-	ret = of_drm_get_panel_orientation(dev->of_node, &jadard->orientation);
-	if (ret < 0)
-		return dev_err_probe(dev, ret, "failed to get orientation\n");
+static const struct jadard_panel_desc waveshare_3_4_inch_c_desc = {
+	.mode_2ln = &(const struct drm_display_mode) {
+		.clock		= (800 + 40 + 20 + 20) * (800 + 24 + 4 + 12) * 60 / 1000,
 
-	ret = drm_panel_of_backlight(&jadard->panel);
-	if (ret)
-		return ret;
+		.hdisplay	= 800,
+		.hsync_start	= 800 + 40,
+		.hsync_end	= 800 + 40 + 20,
+		.htotal		= 800 + 40 + 20 + 20,
 
-	jadard->panel.prepare_prev_first = true;
+		.vdisplay	= 800,
+		.vsync_start	= 800 + 24,
+		.vsync_end	= 800 + 24 + 4,
+		.vtotal		= 800 + 24 + 4 + 12,
 
-	drm_panel_add(&jadard->panel);
+		.width_mm	= 88,
+		.height_mm	= 88,
+		.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+	},
+	.lanes = 2,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init = waveshare_3_4_c_init,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+};
 
-	mipi_dsi_set_drvdata(dsi, jadard);
-	jadard->dsi = dsi;
-	jadard->desc = desc;
+static int waveshare_4_0_c_init(struct jadard *jadard)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = jadard->dsi };
 
-	ret = mipi_dsi_attach(dsi);
-	if (ret < 0)
-		drm_panel_remove(&jadard->panel);
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	jadard_enable_standard_cmds(&dsi_ctx);
 
-	return ret;
-}
+	jd9365da_switch_page(&dsi_ctx, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0xd0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0xd0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0xfe);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x26);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x78);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0x64);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0xc7);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x18);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x14);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x1b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x16);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x2f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x32);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x53);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x4c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x31);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x20);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x0f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x70, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x73, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x16);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x2f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x32);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x53);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7c, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x4c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x80, 0x31);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x81, 0x20);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x82, 0x0f);
 
-static void jadard_dsi_remove(struct mipi_dsi_device *dsi)
-{
-	struct jadard *jadard = mipi_dsi_get_drvdata(dsi);
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x05, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x06, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x07, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x08, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0a, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0b, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0d, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0f, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x10, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x11, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x12, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x13, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x14, 0x42);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x16, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x5e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1e, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1f, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x20, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x21, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x22, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x23, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x25, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x26, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x27, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x28, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x29, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2a, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2c, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2d, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2e, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2f, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x30, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x31, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x32, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x33, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x34, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x36, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x46, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x47, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x48, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x49, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4a, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4b, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4c, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4d, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4e, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4f, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x50, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x51, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x52, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x53, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x54, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x56, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x1f);
 
-	mipi_dsi_detach(dsi);
-	drm_panel_remove(&jadard->panel);
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x58, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5c, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0xa6);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x73);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0xd9);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x33);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x43);
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	msleep(120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	msleep(5);
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+
+	return dsi_ctx.accum_err;
 }
 
-static const struct of_device_id jadard_of_match[] = {
-	{
-		.compatible = "anbernic,rg-ds-display-bottom",
-		.data = &anbernic_rgds_display_desc
-	},
-	{
-		.compatible = "anbernic,rg-ds-display-top",
-		.data = &anbernic_rgds_display_desc
-	},
-	{
-		.compatible = "chongzhou,cz101b4001",
-		.data = &cz101b4001_desc
-	},
-	{
-		.compatible = "kingdisplay,kd101ne3-40ti",
-		.data = &kingdisplay_kd101ne3_40ti_desc
-	},
-	{
-		.compatible = "melfas,lmfbx101117480",
-		.data = &melfas_lmfbx101117480_desc
-	},
-	{
-		.compatible = "radxa,display-10hd-ad001",
-		.data = &cz101b4001_desc
+static const struct jadard_panel_desc waveshare_4_0_inch_c_desc = {
+	.mode_2ln = &(const struct drm_display_mode) {
+		.clock		= (720 + 40 + 20 + 20) * (720 + 24 + 4 + 12) * 60 / 1000,
+
+		.hdisplay	= 720,
+		.hsync_start	= 720 + 40,
+		.hsync_end	= 720 + 40 + 20,
+		.htotal		= 720 + 40 + 20 + 20,
+
+		.vdisplay	= 720,
+		.vsync_start	= 720 + 24,
+		.vsync_end	= 720 + 24 + 4,
+		.vtotal		= 720 + 24 + 4 + 12,
+
+		.width_mm	= 88,
+		.height_mm	= 88,
+		.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 	},
-	{
-		.compatible = "radxa,display-8hd-ad002",
-		.data = &radxa_display_8hd_ad002_desc
+	.lanes = 2,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init = waveshare_4_0_c_init,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+};
+
+static int waveshare_8_0_a_init(struct jadard *jadard)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = jadard->dsi };
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	jadard_enable_standard_cmds(&dsi_ctx);
+
+	jd9365da_switch_page(&dsi_ctx, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
+	if (jadard->dsi->lanes == 4)
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x7e);
+	else
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x4e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x65);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x74);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0xb7);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0xb7);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0xfe);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x70);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0xa0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x0f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x28);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4b, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x56, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0xa9);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x58, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x78);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x63);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x54);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x38);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x28);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x62);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x23);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x70, 0x78);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x63);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x54);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x73, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x38);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x28);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x62);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7c, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x80, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x81, 0x23);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x82, 0x10);
+
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x05, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x06, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x07, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x08, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0a, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0b, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0d, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0f, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x10, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x11, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x12, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x13, 0x35);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x14, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x16, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1e, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1f, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x20, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x21, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x22, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x23, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x25, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x26, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x27, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x28, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x29, 0x35);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2a, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x58, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5c, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x30);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x6b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x0c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x73);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x70, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x73, 0x7b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0xf8);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0xd5);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x2e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x12);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x7b);
+
+	jd9365da_switch_page(&dsi_ctx, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x0e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0xb3);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x60);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x36, 0x59);
+	if (jadard->dsi->lanes != 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x58);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x0f);
+	}
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	msleep(120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	msleep(60);
+
+	return 0;
+}
+
+static const struct drm_display_mode waveshare_8_0_a_mode = {
+	.clock		= (800 + 40 + 20 + 20) * (1280 + 30 + 12 + 4) * 60 / 1000,
+
+	.hdisplay	= 800,
+	.hsync_start	= 800 + 40,
+	.hsync_end	= 800 + 40 + 20,
+	.htotal		= 800 + 40 + 20 + 20,
+
+	.vdisplay	= 1280,
+	.vsync_start	= 1280 + 30,
+	.vsync_end	= 1280 + 30 + 12,
+	.vtotal		= 1280 + 30 + 12 + 4,
+
+	.width_mm	= 107,
+	.height_mm	= 172,
+	.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static const struct jadard_panel_desc waveshare_8_0_inch_a_desc = {
+	.mode_4ln = &waveshare_8_0_a_mode,
+	.mode_2ln = &waveshare_8_0_a_mode,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init = waveshare_8_0_a_init,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+};
+
+static int waveshare_10_1_b_init(struct jadard *jadard);
+
+static const struct jadard_panel_desc waveshare_9_0_inch_b_desc = {
+	.mode_4ln = &(const struct drm_display_mode) {
+		.clock		= (720 + 60 + 60 + 4) * (1280 + 16 + 12 + 4) * 60 / 1000,
+
+		.hdisplay	= 720,
+		.hsync_start	= 720 + 60,
+		.hsync_end	= 720 + 60 + 60,
+		.htotal		= 720 + 60 + 60 + 4,
+
+		.vdisplay	= 1280,
+		.vsync_start	= 1280 + 16,
+		.vsync_end	= 1280 + 16 + 12,
+		.vtotal		= 1280 + 16 + 12 + 4,
+
+		.width_mm	= 114,
+		.height_mm	= 196,
+		.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+	},
+	.mode_2ln = &(const struct drm_display_mode) {
+		.clock		= (720 + 50 + 50 + 50) * (1280 + 26 + 12 + 4) * 60 / 1000,
+
+		.hdisplay	= 720,
+		.hsync_start	= 720 + 50,
+		.hsync_end	= 720 + 50 + 50,
+		.htotal		= 720 + 50 + 50 + 50,
+
+		.vdisplay	= 1280,
+		.vsync_start	= 1280 + 26,
+		.vsync_end	= 1280 + 26 + 12,
+		.vtotal		= 1280 + 26 + 12 + 4,
+
+		.width_mm	= 114,
+		.height_mm	= 196,
+		.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+	},
+	.format = MIPI_DSI_FMT_RGB888,
+	.init = waveshare_10_1_b_init,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+};
+
+static const struct drm_display_mode waveshare_10_1_a_mode = {
+	.clock		= (800 + 40 + 20 + 20) * (1280 + 20 + 20 + 4) * 60 / 1000,
+
+	.hdisplay	= 800,
+	.hsync_start	= 800 + 40,
+	.hsync_end	= 800 + 40 + 20,
+	.htotal		= 800 + 40 + 20 + 20,
+
+	.vdisplay	= 1280,
+	.vsync_start	= 1280 + 20,
+	.vsync_end	= 1280 + 20 + 20,
+	.vtotal		= 1280 + 20 + 20 + 4,
+
+	.width_mm	= 135,
+	.height_mm	= 216,
+	.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static int waveshare_10_1_a_init(struct jadard *jadard)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = jadard->dsi };
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	jadard_enable_standard_cmds(&dsi_ctx);
+
+	jd9365da_switch_page(&dsi_ctx, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
+	if (jadard->dsi->lanes == 4)
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x3b);
+	else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x38);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x10);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x38);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x74);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0xaf);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0xaf);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x26);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x78);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0xa0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0x81);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x14);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x23);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x1e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x0d);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x28);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x69);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x7f);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x6b);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x5c);
+	} else  {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x6a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x5b);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x4f);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x4d);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x3f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x42);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x2b);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x4a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x3d);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x41);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x2a);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x43);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x43);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x63);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x44);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x62);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x52);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x5a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x4f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x4e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x20);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x0f);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x59);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x4c);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x48);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x3a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x26);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x70, 0x7f);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x6b);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x5c);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x6a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x5b);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x73, 0x4f);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x4d);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x3f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x42);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x2b);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x4a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x3d);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x41);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x2a);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x43);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x43);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x63);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x44);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x62);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7c, 0x52);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x5a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x4f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0x4e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x80, 0x20);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x81, 0x0f);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x59);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x4c);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0x48);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x80, 0x3a);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x81, 0x26);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x82, 0x00);
+
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x02);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x02);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0x00);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x00);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x1e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x05, 0x1e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x06, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x07, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x08, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x17);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0a, 0x17);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0b, 0x37);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x37);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x42);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x42);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0x40);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x40);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x5e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x05, 0x5e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x06, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x07, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x08, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x57);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0a, 0x57);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0b, 0x77);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x77);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0d, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0f, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x10, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x11, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x12, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x13, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x14, 0x49);
+	if (jadard->dsi->lanes == 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x16, 0x01);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x01);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0x00);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x00);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x1e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0x1e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1e, 0x1f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1f, 0x17);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x20, 0x17);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x21, 0x37);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x22, 0x37);
+	} else {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x16, 0x41);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x41);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0x40);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x40);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x5e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0x5e);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1e, 0x5f);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1f, 0x57);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x20, 0x57);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x21, 0x77);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x22, 0x77);
+	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x23, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x25, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x26, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x27, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x28, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x29, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2a, 0x48);
+	if (jadard->dsi->lanes == 4)
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x1f);
+	else
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2c, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2d, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2e, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2f, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x30, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x31, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x32, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x33, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x34, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x36, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x46, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x47, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x48, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x49, 0x1e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4a, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4b, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4c, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4d, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4e, 0x37);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4f, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x50, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x51, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x52, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x53, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x54, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x56, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x58, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x30);
+	if (jadard->dsi->lanes == 4)
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5c, 0x16);
+	else
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x34);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x6a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x73);
+	if (jadard->dsi->lanes == 4)
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x1d);
+	else
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x6a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0xdd);
+	if (jadard->dsi->lanes == 4)
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x3f);
+	else
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x2c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x15);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x14);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x82);
+
+	jd9365da_switch_page(&dsi_ctx, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x0e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0xb3);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x61);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x48);
+	if (jadard->dsi->lanes != 4) {
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x58);
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x0f);
+	}
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe6, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe7, 0x0c);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	msleep(120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	msleep(60);
+
+	return dsi_ctx.accum_err;
+}
+
+static const struct jadard_panel_desc waveshare_10_1_inch_a_desc = {
+	.mode_4ln = &waveshare_10_1_a_mode,
+	.mode_2ln = &waveshare_10_1_a_mode,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init = waveshare_10_1_a_init,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+};
+
+static int waveshare_10_1_b_init(struct jadard *jadard)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = jadard->dsi };
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	jadard_enable_standard_cmds(&dsi_ctx);
+
+	jd9365da_switch_page(&dsi_ctx, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x3f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0xbf);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0xbf);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0xfe);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x74);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0xa0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0x7e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x1a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x0f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0xa9);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x59, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x38);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x1a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x65);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x52);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x2d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x2d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x14);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x28);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x23);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x3f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x2d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x34);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x27);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x18);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x70, 0x7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x71, 0x65);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x72, 0x52);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x73, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x74, 0x3d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x2d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x2d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0x14);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x28);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x23);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7b, 0x3f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7c, 0x2d);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x34);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x27);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x80, 0x18);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x81, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x82, 0x00);
+
+	jd9365da_switch_page(&dsi_ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x51);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x55);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x03, 0x51);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x04, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x05, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x06, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x07, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x08, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0a, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0b, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0c, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0d, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0f, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x10, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x11, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x12, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x13, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x14, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x16, 0x51);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x17, 0x55);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x18, 0x50);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x19, 0x51);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1a, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1b, 0x77);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1c, 0x57);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1e, 0x47);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1f, 0x46);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x20, 0x45);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x21, 0x44);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x22, 0x4b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x23, 0x4a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x24, 0x49);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x25, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x26, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x27, 0x41);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x28, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x29, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2a, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x5f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2c, 0x11);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2d, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2e, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2f, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x30, 0x15);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x31, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x32, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x33, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x34, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x35, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x36, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x38, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x39, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3a, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3c, 0x11);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3d, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3e, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3f, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x40, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x41, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x42, 0x11);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x43, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x44, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x45, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x46, 0x15);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x47, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x48, 0x17);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x49, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4a, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4b, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4c, 0x0a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4d, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4e, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x4f, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x50, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x51, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x52, 0x11);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x53, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x54, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x55, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x56, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x57, 0x1f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x58, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5b, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5c, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5d, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5e, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x60, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x61, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x62, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x63, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x64, 0x66);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x65, 0x55);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x66, 0x13);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x67, 0x73);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x68, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x69, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6a, 0x66);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6b, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6c, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6d, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6e, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x88);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0xe3);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x76, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x77, 0xd5);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x78, 0x2a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x79, 0x21);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7a, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7e, 0x66);
+
+	jd9365da_switch_page(&dsi_ctx, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x0e);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x02, 0xb3);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x09, 0x60);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x0e, 0x48);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x37, 0x58);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2b, 0x0f);
+
+	jd9365da_switch_page(&dsi_ctx, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x15, 0x1d);
+
+	jd9365da_switch_page(&dsi_ctx, 0x00);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	msleep(120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	msleep(5);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_SET_TEAR_ON);
+
+	return 0;
+}
+
+static const struct jadard_panel_desc waveshare_10_1_inch_b_desc = {
+	.mode_4ln = &(const struct drm_display_mode) {
+		.clock		= (720 + 60 + 60 + 4) * (1280 + 16 + 12 + 4) * 60 / 1000,
+
+		.hdisplay	= 720,
+		.hsync_start	= 720 + 60,
+		.hsync_end	= 720 + 60 + 60,
+		.htotal		= 720 + 60 + 60 + 4,
+
+		.vdisplay	= 1280,
+		.vsync_start	= 1280 + 16,
+		.vsync_end	= 1280 + 16 + 12,
+		.vtotal		= 1280 + 16 + 12 + 4,
+
+		.width_mm	= 125,
+		.height_mm	= 222,
+		.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+	},
+	.mode_2ln = &(const struct drm_display_mode) {
+		.clock		= (720 + 50 + 50 + 50) * (1280 + 26 + 12 + 4) * 60 / 1000,
+
+		.hdisplay	= 720,
+		.hsync_start	= 720 + 50,
+		.hsync_end	= 720 + 50 + 50,
+		.htotal		= 720 + 50 + 50 + 50,
+
+		.vdisplay	= 1280,
+		.vsync_start	= 1280 + 26,
+		.vsync_end	= 1280 + 26 + 12,
+		.vtotal		= 1280 + 26 + 12 + 4,
+
+		.width_mm	= 125,
+		.height_mm	= 222,
+		.type		= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+	},
+	.format = MIPI_DSI_FMT_RGB888,
+	.init = waveshare_10_1_b_init,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+		MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+};
+
+static int jadard_dsi_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct jadard_panel_desc *desc;
+	struct jadard *jadard;
+	int ret;
+
+	jadard = devm_drm_panel_alloc(dev, struct jadard, panel, &jadard_funcs,
+				      DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(jadard))
+		return PTR_ERR(jadard);
+
+	desc = of_device_get_match_data(dev);
+
+	if (desc->mode_flags)
+		dsi->mode_flags = desc->mode_flags;
+	else
+		dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+				  MIPI_DSI_MODE_VIDEO_BURST |
+				  MIPI_DSI_MODE_NO_EOT_PACKET;
+
+	dsi->format = desc->format;
+	dsi->lanes = desc->lanes;
+	if (!dsi->lanes) {
+		dsi->lanes = drm_of_get_data_lanes_count_remote(dsi->dev.of_node, 0, -1, 2, 4);
+		if (dsi->lanes < 0)
+			return dsi->lanes;
+	}
+	dev_dbg(&dsi->dev, "lanes: %d\n", dsi->lanes);
+
+	jadard->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(jadard->reset))
+		return dev_err_probe(&dsi->dev, PTR_ERR(jadard->reset),
+				"failed to get our reset GPIO\n");
+
+	jadard->vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(jadard->vdd))
+		return dev_err_probe(&dsi->dev, PTR_ERR(jadard->vdd),
+				"failed to get vdd regulator\n");
+
+	jadard->vccio = devm_regulator_get(dev, "vccio");
+	if (IS_ERR(jadard->vccio))
+		return dev_err_probe(&dsi->dev, PTR_ERR(jadard->vccio),
+				"failed to get vccio regulator\n");
+
+	ret = of_drm_get_panel_orientation(dev->of_node, &jadard->orientation);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get orientation\n");
+
+	ret = drm_panel_of_backlight(&jadard->panel);
+	if (ret)
+		return ret;
+
+	jadard->panel.prepare_prev_first = true;
+
+	drm_panel_add(&jadard->panel);
+
+	mipi_dsi_set_drvdata(dsi, jadard);
+	jadard->dsi = dsi;
+	jadard->desc = desc;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0)
+		drm_panel_remove(&jadard->panel);
+
+	return ret;
+}
+
+static void jadard_dsi_remove(struct mipi_dsi_device *dsi)
+{
+	struct jadard *jadard = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_panel_remove(&jadard->panel);
+}
+
+static const struct of_device_id jadard_of_match[] = {
+	{
+		.compatible = "anbernic,rg-ds-display-bottom",
+		.data = &anbernic_rgds_display_desc
+	},
+	{
+		.compatible = "anbernic,rg-ds-display-top",
+		.data = &anbernic_rgds_display_desc
+	},
+	{
+		.compatible = "chongzhou,cz101b4001",
+		.data = &cz101b4001_desc
+	},
+	{
+		.compatible = "kingdisplay,kd101ne3-40ti",
+		.data = &kingdisplay_kd101ne3_40ti_desc
+	},
+	{
+		.compatible = "melfas,lmfbx101117480",
+		.data = &melfas_lmfbx101117480_desc
+	},
+	{
+		.compatible = "radxa,display-10hd-ad001",
+		.data = &cz101b4001_desc
+	},
+	{
+		.compatible = "radxa,display-8hd-ad002",
+		.data = &radxa_display_8hd_ad002_desc
 	},
 	{
 		.compatible = "taiguanck,xti05101-01a",
 		.data = &taiguan_xti05101_01a_desc
 	},
+	{
+		.compatible = "waveshare,3.4-dsi-touch-c",
+		.data = &waveshare_3_4_inch_c_desc
+	},
+	{
+		.compatible = "waveshare,4.0-dsi-touch-c",
+		.data = &waveshare_4_0_inch_c_desc
+	},
+	{
+		.compatible = "waveshare,8.0-dsi-touch-a",
+		.data = &waveshare_8_0_inch_a_desc
+	},
+	{
+		.compatible = "waveshare,9.0-dsi-touch-b",
+		.data = &waveshare_9_0_inch_b_desc
+	},
+	{
+		.compatible = "waveshare,10.1-dsi-touch-a",
+		.data = &waveshare_10_1_inch_a_desc
+	},
+	{
+		.compatible = "waveshare,10.1-dsi-touch-b",
+		.data = &waveshare_10_1_inch_b_desc
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, jadard_of_match);

-- 
2.47.3

Re: [PATCH 14/19] drm/panel: jadard-jd9365da-h3: support Waveshare DSI panels

[Riccardo Mereu]

On Wed, 01 Apr 2026 10:26:33 +0300 Dmitry Baryshkov wrote:
>From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
>Add configuration for Waveshare DSI panels using JD9365 controller.
>
>Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Tested-by: Riccardo Mereu <r.mereu@arduino.cc>

Re: [PATCH 14/19] drm/panel: jadard-jd9365da-h3: support Waveshare DSI panels

[Linus Walleij]

Hi Dmitry,

thanks for your patch!

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Add configuration for Waveshare DSI panels using JD9365 controller.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Some more words with details on all the panels added perhaps?

> -       desc = of_device_get_match_data(dev);
> +       jd9365da_switch_page(&dsi_ctx, 0x01);
> +       mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
> +       mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x41);

Predictably I'm not very happy with all the unexplained magic and nonestisting
defines used here. Do you have some info/defines?

But there is also one more thing, this looks like a big "jam table"
with just register+value tuples, so construct something like:

struct jadard_jam_tbl_entry {
        u8 reg;
        u8 val;
};

static const struct jadard_jam_tbl_entry jd_3_4_c_init_jam[] = {
        {0x00, 0x00}, {0x01, 0x41}, ...};

(Ideas taken from drivers/net/dsa/realtek/rtl8366rb.c, take a look
for code and all, you get the picture.)

Yours,
Linus Walleij

Re: [PATCH 14/19] drm/panel: jadard-jd9365da-h3: support Waveshare DSI panels

[Dmitry Baryshkov]

On Wed, Apr 08, 2026 at 10:24:17AM +0200, Linus Walleij wrote:
> Hi Dmitry,
> 
> thanks for your patch!
> 
> On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
> <dmitry.baryshkov@oss.qualcomm.com> wrote:
> 
> > Add configuration for Waveshare DSI panels using JD9365 controller.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> 
> Some more words with details on all the panels added perhaps?

:D

> 
> > -       desc = of_device_get_match_data(dev);
> > +       jd9365da_switch_page(&dsi_ctx, 0x01);
> > +       mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x00);
> > +       mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x01, 0x41);
> 
> Predictably I'm not very happy with all the unexplained magic and nonestisting
> defines used here. Do you have some info/defines?

No, unfortunately.

> 
> But there is also one more thing, this looks like a big "jam table"
> with just register+value tuples, so construct something like:
> 
> struct jadard_jam_tbl_entry {
>         u8 reg;
>         u8 val;
> };
> 
> static const struct jadard_jam_tbl_entry jd_3_4_c_init_jam[] = {
>         {0x00, 0x00}, {0x01, 0x41}, ...};
> 
> (Ideas taken from drivers/net/dsa/realtek/rtl8366rb.c, take a look
> for code and all, you get the picture.)

Few months ago the code was moved exactly in the opposite direction. We
added all _multi() functions and made shure that the code is as
efficient as the register tables. On the other hand, having it as a code
allows better control. E.g. handling 2/4 lane case would require extra
hacks to the register tables, while the code handles that without extra
hacks and without loosing effectiveness.

> 
> Yours,
> Linus Walleij

-- 
With best wishes
Dmitry

[PATCH 15/19] drm/panel: ilitek-ili9881c: support Waveshare 7.0" DSI panel

[Dmitry Baryshkov]

Enable support for Waveshare 7.0" DSI TOUCH-A panel. It requires
additional voltage regulator, iovcc.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 251 +++++++++++++++++++++++++-
 1 file changed, 249 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index 947b47841b01..0652cdb57d11 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -52,6 +52,7 @@ struct ili9881c {
 	const struct ili9881c_desc	*desc;
 
 	struct regulator	*power;
+	struct regulator	*iovcc;
 	struct gpio_desc	*reset;
 
 	enum drm_panel_orientation	orientation;
@@ -1997,6 +1998,205 @@ static const struct ili9881c_instr bsd1218_a101kl68_init[] = {
 	ILI9881C_COMMAND_INSTR(0xd3, 0x3f),
 };
 
+static const struct ili9881c_instr waveshare_7inch_a_init[] = {
+	ILI9881C_SWITCH_PAGE_INSTR(3),
+	ILI9881C_COMMAND_INSTR(0x01, 0x00),
+	ILI9881C_COMMAND_INSTR(0x02, 0x00),
+	ILI9881C_COMMAND_INSTR(0x03, 0x73),
+	ILI9881C_COMMAND_INSTR(0x04, 0x00),
+	ILI9881C_COMMAND_INSTR(0x05, 0x00),
+	ILI9881C_COMMAND_INSTR(0x06, 0x0a),
+	ILI9881C_COMMAND_INSTR(0x07, 0x00),
+	ILI9881C_COMMAND_INSTR(0x08, 0x00),
+	ILI9881C_COMMAND_INSTR(0x09, 0x61),
+	ILI9881C_COMMAND_INSTR(0x0a, 0x00),
+	ILI9881C_COMMAND_INSTR(0x0b, 0x00),
+	ILI9881C_COMMAND_INSTR(0x0c, 0x01),
+	ILI9881C_COMMAND_INSTR(0x0d, 0x00),
+	ILI9881C_COMMAND_INSTR(0x0e, 0x00),
+	ILI9881C_COMMAND_INSTR(0x0f, 0x61),
+	ILI9881C_COMMAND_INSTR(0x10, 0x61),
+	ILI9881C_COMMAND_INSTR(0x11, 0x00),
+	ILI9881C_COMMAND_INSTR(0x12, 0x00),
+	ILI9881C_COMMAND_INSTR(0x13, 0x00),
+	ILI9881C_COMMAND_INSTR(0x14, 0x00),
+	ILI9881C_COMMAND_INSTR(0x15, 0x00),
+	ILI9881C_COMMAND_INSTR(0x16, 0x00),
+	ILI9881C_COMMAND_INSTR(0x17, 0x00),
+	ILI9881C_COMMAND_INSTR(0x18, 0x00),
+	ILI9881C_COMMAND_INSTR(0x19, 0x00),
+	ILI9881C_COMMAND_INSTR(0x1a, 0x00),
+	ILI9881C_COMMAND_INSTR(0x1b, 0x00),
+	ILI9881C_COMMAND_INSTR(0x1c, 0x00),
+	ILI9881C_COMMAND_INSTR(0x1d, 0x00),
+	ILI9881C_COMMAND_INSTR(0x1e, 0x40),
+	ILI9881C_COMMAND_INSTR(0x1f, 0x80),
+	ILI9881C_COMMAND_INSTR(0x20, 0x06),
+	ILI9881C_COMMAND_INSTR(0x21, 0x01),
+	ILI9881C_COMMAND_INSTR(0x22, 0x00),
+	ILI9881C_COMMAND_INSTR(0x23, 0x00),
+	ILI9881C_COMMAND_INSTR(0x24, 0x00),
+	ILI9881C_COMMAND_INSTR(0x25, 0x00),
+	ILI9881C_COMMAND_INSTR(0x26, 0x00),
+	ILI9881C_COMMAND_INSTR(0x27, 0x00),
+	ILI9881C_COMMAND_INSTR(0x28, 0x33),
+	ILI9881C_COMMAND_INSTR(0x29, 0x03),
+	ILI9881C_COMMAND_INSTR(0x2a, 0x00),
+	ILI9881C_COMMAND_INSTR(0x2b, 0x00),
+	ILI9881C_COMMAND_INSTR(0x2c, 0x00),
+	ILI9881C_COMMAND_INSTR(0x2d, 0x00),
+	ILI9881C_COMMAND_INSTR(0x2e, 0x00),
+	ILI9881C_COMMAND_INSTR(0x2f, 0x00),
+	ILI9881C_COMMAND_INSTR(0x30, 0x00),
+	ILI9881C_COMMAND_INSTR(0x31, 0x00),
+	ILI9881C_COMMAND_INSTR(0x32, 0x00),
+	ILI9881C_COMMAND_INSTR(0x33, 0x00),
+	ILI9881C_COMMAND_INSTR(0x34, 0x04),
+	ILI9881C_COMMAND_INSTR(0x35, 0x00),
+	ILI9881C_COMMAND_INSTR(0x36, 0x00),
+	ILI9881C_COMMAND_INSTR(0x37, 0x00),
+	ILI9881C_COMMAND_INSTR(0x38, 0x3c),
+	ILI9881C_COMMAND_INSTR(0x39, 0x00),
+	ILI9881C_COMMAND_INSTR(0x3a, 0x00),
+	ILI9881C_COMMAND_INSTR(0x3b, 0x00),
+	ILI9881C_COMMAND_INSTR(0x3c, 0x00),
+	ILI9881C_COMMAND_INSTR(0x3d, 0x00),
+	ILI9881C_COMMAND_INSTR(0x3e, 0x00),
+	ILI9881C_COMMAND_INSTR(0x3f, 0x00),
+	ILI9881C_COMMAND_INSTR(0x40, 0x00),
+	ILI9881C_COMMAND_INSTR(0x41, 0x00),
+	ILI9881C_COMMAND_INSTR(0x42, 0x00),
+	ILI9881C_COMMAND_INSTR(0x43, 0x00),
+	ILI9881C_COMMAND_INSTR(0x44, 0x00),
+	ILI9881C_COMMAND_INSTR(0x50, 0x10),
+	ILI9881C_COMMAND_INSTR(0x51, 0x32),
+	ILI9881C_COMMAND_INSTR(0x52, 0x54),
+	ILI9881C_COMMAND_INSTR(0x53, 0x76),
+	ILI9881C_COMMAND_INSTR(0x54, 0x98),
+	ILI9881C_COMMAND_INSTR(0x55, 0xba),
+	ILI9881C_COMMAND_INSTR(0x56, 0x10),
+	ILI9881C_COMMAND_INSTR(0x57, 0x32),
+	ILI9881C_COMMAND_INSTR(0x58, 0x54),
+	ILI9881C_COMMAND_INSTR(0x59, 0x76),
+	ILI9881C_COMMAND_INSTR(0x5a, 0x98),
+	ILI9881C_COMMAND_INSTR(0x5b, 0xba),
+	ILI9881C_COMMAND_INSTR(0x5c, 0xdc),
+	ILI9881C_COMMAND_INSTR(0x5d, 0xfe),
+	ILI9881C_COMMAND_INSTR(0x5e, 0x00),
+	ILI9881C_COMMAND_INSTR(0x5f, 0x0e),
+	ILI9881C_COMMAND_INSTR(0x60, 0x0f),
+	ILI9881C_COMMAND_INSTR(0x61, 0x0c),
+	ILI9881C_COMMAND_INSTR(0x62, 0x0d),
+	ILI9881C_COMMAND_INSTR(0x63, 0x06),
+	ILI9881C_COMMAND_INSTR(0x64, 0x07),
+	ILI9881C_COMMAND_INSTR(0x65, 0x02),
+	ILI9881C_COMMAND_INSTR(0x66, 0x02),
+	ILI9881C_COMMAND_INSTR(0x67, 0x02),
+	ILI9881C_COMMAND_INSTR(0x68, 0x02),
+	ILI9881C_COMMAND_INSTR(0x69, 0x01),
+	ILI9881C_COMMAND_INSTR(0x6a, 0x00),
+	ILI9881C_COMMAND_INSTR(0x6b, 0x02),
+	ILI9881C_COMMAND_INSTR(0x6c, 0x15),
+	ILI9881C_COMMAND_INSTR(0x6d, 0x14),
+	ILI9881C_COMMAND_INSTR(0x6e, 0x02),
+	ILI9881C_COMMAND_INSTR(0x6f, 0x02),
+	ILI9881C_COMMAND_INSTR(0x70, 0x02),
+	ILI9881C_COMMAND_INSTR(0x71, 0x02),
+	ILI9881C_COMMAND_INSTR(0x72, 0x02),
+	ILI9881C_COMMAND_INSTR(0x73, 0x02),
+	ILI9881C_COMMAND_INSTR(0x74, 0x02),
+	ILI9881C_COMMAND_INSTR(0x75, 0x0e),
+	ILI9881C_COMMAND_INSTR(0x76, 0x0f),
+	ILI9881C_COMMAND_INSTR(0x77, 0x0c),
+	ILI9881C_COMMAND_INSTR(0x78, 0x0d),
+	ILI9881C_COMMAND_INSTR(0x79, 0x06),
+	ILI9881C_COMMAND_INSTR(0x7a, 0x07),
+	ILI9881C_COMMAND_INSTR(0x7b, 0x02),
+	ILI9881C_COMMAND_INSTR(0x7c, 0x02),
+	ILI9881C_COMMAND_INSTR(0x7d, 0x02),
+	ILI9881C_COMMAND_INSTR(0x7e, 0x02),
+	ILI9881C_COMMAND_INSTR(0x7f, 0x01),
+	ILI9881C_COMMAND_INSTR(0x80, 0x00),
+	ILI9881C_COMMAND_INSTR(0x81, 0x02),
+	ILI9881C_COMMAND_INSTR(0x82, 0x14),
+	ILI9881C_COMMAND_INSTR(0x83, 0x15),
+	ILI9881C_COMMAND_INSTR(0x84, 0x02),
+	ILI9881C_COMMAND_INSTR(0x85, 0x02),
+	ILI9881C_COMMAND_INSTR(0x86, 0x02),
+	ILI9881C_COMMAND_INSTR(0x87, 0x02),
+	ILI9881C_COMMAND_INSTR(0x88, 0x02),
+	ILI9881C_COMMAND_INSTR(0x89, 0x02),
+	ILI9881C_COMMAND_INSTR(0x8a, 0x02),
+
+	ILI9881C_SWITCH_PAGE_INSTR(4),
+	ILI9881C_COMMAND_INSTR(0x38, 0x01),
+	ILI9881C_COMMAND_INSTR(0x39, 0x00),
+	ILI9881C_COMMAND_INSTR(0x6c, 0x15),
+	ILI9881C_COMMAND_INSTR(0x6e, 0x2a),
+	ILI9881C_COMMAND_INSTR(0x6f, 0x33),
+	ILI9881C_COMMAND_INSTR(0x3a, 0x94),
+	ILI9881C_COMMAND_INSTR(0x8d, 0x14),
+	ILI9881C_COMMAND_INSTR(0x87, 0xba),
+	ILI9881C_COMMAND_INSTR(0x26, 0x76),
+	ILI9881C_COMMAND_INSTR(0xb2, 0xd1),
+	ILI9881C_COMMAND_INSTR(0xb5, 0x06),
+	ILI9881C_COMMAND_INSTR(0x3b, 0x98),
+
+	ILI9881C_SWITCH_PAGE_INSTR(1),
+	ILI9881C_COMMAND_INSTR(0x22, 0x0a),
+	ILI9881C_COMMAND_INSTR(0x31, 0x00),
+	ILI9881C_COMMAND_INSTR(0x53, 0x71),
+	ILI9881C_COMMAND_INSTR(0x55, 0x8f),
+	ILI9881C_COMMAND_INSTR(0x40, 0x33),
+	ILI9881C_COMMAND_INSTR(0x50, 0x96),
+	ILI9881C_COMMAND_INSTR(0x51, 0x96),
+	ILI9881C_COMMAND_INSTR(0x60, 0x23),
+	ILI9881C_COMMAND_INSTR(0xa0, 0x08),
+	ILI9881C_COMMAND_INSTR(0xa1, 0x1d),
+	ILI9881C_COMMAND_INSTR(0xa2, 0x2a),
+	ILI9881C_COMMAND_INSTR(0xa3, 0x10),
+	ILI9881C_COMMAND_INSTR(0xa4, 0x15),
+	ILI9881C_COMMAND_INSTR(0xa5, 0x28),
+	ILI9881C_COMMAND_INSTR(0xa6, 0x1c),
+	ILI9881C_COMMAND_INSTR(0xa7, 0x1d),
+	ILI9881C_COMMAND_INSTR(0xa8, 0x7e),
+	ILI9881C_COMMAND_INSTR(0xa9, 0x1d),
+	ILI9881C_COMMAND_INSTR(0xaa, 0x29),
+	ILI9881C_COMMAND_INSTR(0xab, 0x6b),
+	ILI9881C_COMMAND_INSTR(0xac, 0x1a),
+	ILI9881C_COMMAND_INSTR(0xad, 0x18),
+	ILI9881C_COMMAND_INSTR(0xae, 0x4b),
+	ILI9881C_COMMAND_INSTR(0xaf, 0x20),
+	ILI9881C_COMMAND_INSTR(0xb0, 0x27),
+	ILI9881C_COMMAND_INSTR(0xb1, 0x50),
+	ILI9881C_COMMAND_INSTR(0xb2, 0x64),
+	ILI9881C_COMMAND_INSTR(0xb3, 0x39),
+	ILI9881C_COMMAND_INSTR(0xc0, 0x08),
+	ILI9881C_COMMAND_INSTR(0xc1, 0x1d),
+	ILI9881C_COMMAND_INSTR(0xc2, 0x2a),
+	ILI9881C_COMMAND_INSTR(0xc3, 0x10),
+	ILI9881C_COMMAND_INSTR(0xc4, 0x15),
+	ILI9881C_COMMAND_INSTR(0xc5, 0x28),
+	ILI9881C_COMMAND_INSTR(0xc6, 0x1c),
+	ILI9881C_COMMAND_INSTR(0xc7, 0x1d),
+	ILI9881C_COMMAND_INSTR(0xc8, 0x7e),
+	ILI9881C_COMMAND_INSTR(0xc9, 0x1d),
+	ILI9881C_COMMAND_INSTR(0xca, 0x29),
+	ILI9881C_COMMAND_INSTR(0xcb, 0x6b),
+	ILI9881C_COMMAND_INSTR(0xcc, 0x1a),
+	ILI9881C_COMMAND_INSTR(0xcd, 0x18),
+	ILI9881C_COMMAND_INSTR(0xce, 0x4b),
+	ILI9881C_COMMAND_INSTR(0xcf, 0x20),
+	ILI9881C_COMMAND_INSTR(0xd0, 0x27),
+	ILI9881C_COMMAND_INSTR(0xd1, 0x50),
+	ILI9881C_COMMAND_INSTR(0xd2, 0x64),
+	ILI9881C_COMMAND_INSTR(0xd3, 0x39),
+
+	ILI9881C_SWITCH_PAGE_INSTR(0),
+	ILI9881C_COMMAND_INSTR(0x3a, 0x77),
+	ILI9881C_COMMAND_INSTR(0x36, 0x00),
+};
+
 static inline struct ili9881c *panel_to_ili9881c(struct drm_panel *panel)
 {
 	return container_of(panel, struct ili9881c, panel);
@@ -2035,9 +2235,19 @@ static int ili9881c_prepare(struct drm_panel *panel)
 	int ret;
 
 	/* Power the panel */
+	if (ctx->iovcc) {
+		ret = regulator_enable(ctx->iovcc);
+		if (ret)
+			return ret;
+	}
+
+	msleep(5);
 	ret = regulator_enable(ctx->power);
-	if (ret)
-		return ret;
+	if (ret) {
+		mctx.accum_err = ret;
+		goto disable_iovcc;
+	}
+
 	msleep(5);
 
 	/* And reset it */
@@ -2074,6 +2284,9 @@ static int ili9881c_prepare(struct drm_panel *panel)
 
 disable_power:
 	regulator_disable(ctx->power);
+disable_iovcc:
+	if (ctx->iovcc)
+		regulator_disable(ctx->iovcc);
 	return mctx.accum_err;
 }
 
@@ -2085,6 +2298,8 @@ static int ili9881c_unprepare(struct drm_panel *panel)
 	mipi_dsi_dcs_set_display_off_multi(&mctx);
 	mipi_dsi_dcs_enter_sleep_mode_multi(&mctx);
 	regulator_disable(ctx->power);
+	if (ctx->iovcc)
+		regulator_disable(ctx->iovcc);
 	gpiod_set_value_cansleep(ctx->reset, 1);
 
 	return 0;
@@ -2260,6 +2475,23 @@ static const struct drm_display_mode bsd1218_a101kl68_default_mode = {
 	.height_mm	= 170,
 };
 
+static const struct drm_display_mode waveshare_7inch_a_mode = {
+	.clock		= 83333,
+
+	.hdisplay	= 720,
+	.hsync_start	= 720 + 120,
+	.hsync_end	= 720 + 120 + 100,
+	.htotal		= 720 + 120 + 100 + 100,
+
+	.vdisplay	= 1280,
+	.vsync_start	= 1280 + 10,
+	.vsync_end	= 1280 + 10 + 10,
+	.vtotal		= 1280 + 10 + 10 + 10,
+
+	.width_mm	= 85,
+	.height_mm	= 154,
+};
+
 static int ili9881c_get_modes(struct drm_panel *panel,
 			      struct drm_connector *connector)
 {
@@ -2329,6 +2561,11 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->power),
 				     "Couldn't get our power regulator\n");
 
+	ctx->iovcc = devm_regulator_get_optional(&dsi->dev, "iovcc");
+	if (IS_ERR(ctx->iovcc))
+		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->iovcc),
+				     "Couldn't get our iovcc regulator\n");
+
 	ctx->reset = devm_gpiod_get_optional(&dsi->dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(ctx->reset))
 		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->reset),
@@ -2454,6 +2691,15 @@ static const struct ili9881c_desc bsd1218_a101kl68_desc = {
 	.lanes = 4,
 };
 
+static const struct ili9881c_desc waveshare_7inch_a_desc = {
+	.init = waveshare_7inch_a_init,
+	.init_length = ARRAY_SIZE(waveshare_7inch_a_init),
+	.mode = &waveshare_7inch_a_mode,
+	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_HSE |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+	.lanes = 2,
+};
+
 static const struct of_device_id ili9881c_of_match[] = {
 	{ .compatible = "bananapi,lhr050h41", .data = &lhr050h41_desc },
 	{ .compatible = "bestar,bsd1218-a101kl68", .data = &bsd1218_a101kl68_desc },
@@ -2462,6 +2708,7 @@ static const struct of_device_id ili9881c_of_match[] = {
 	{ .compatible = "tdo,tl050hdv35", .data = &tl050hdv35_desc },
 	{ .compatible = "wanchanglong,w552946aaa", .data = &w552946aaa_desc },
 	{ .compatible = "wanchanglong,w552946aba", .data = &w552946aba_desc },
+	{ .compatible = "waveshare,7.0-dsi-touch-a", .data = &waveshare_7inch_a_desc },
 	{ .compatible = "ampire,am8001280g", .data = &am8001280g_desc },
 	{ .compatible = "raspberrypi,dsi-5inch", &rpi_5inch_desc },
 	{ .compatible = "raspberrypi,dsi-7inch", &rpi_7inch_desc },

-- 
2.47.3

Re: [PATCH 15/19] drm/panel: ilitek-ili9881c: support Waveshare 7.0" DSI panel

[Linus Walleij]

Hi Dmitry,

thanks for your patch!

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Enable support for Waveshare 7.0" DSI TOUCH-A panel. It requires
> additional voltage regulator, iovcc.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
(...)
> +       ILI9881C_COMMAND_INSTR(0x01, 0x00),
> +       ILI9881C_COMMAND_INSTR(0x02, 0x00),

Same comment about using a jam table here.

Yours,
Linus Walleij

[PATCH 16/19] drm/panel: add devm_drm_panel_add() helper

[Dmitry Baryshkov]

Add devm_drm_panel_add(), devres-managed version of drm_panel_add().
It's not uncommon for the panel drivers to use devres functions for most
of the resources. Provide corresponding replacement for drm_panel_add().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/drm_panel.c | 23 +++++++++++++++++++++++
 include/drm/drm_panel.h     |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index d1e6598ea3bc..a6029b699b73 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -101,6 +101,29 @@ void drm_panel_remove(struct drm_panel *panel)
 }
 EXPORT_SYMBOL(drm_panel_remove);
 
+static void drm_panel_add_release(void *data)
+{
+	drm_panel_remove(data);
+}
+
+/**
+ * devm_drm_panel_add - add a panel to the global registry using devres
+ * @panel: panel to add
+ *
+ * Add a panel to the global registry so that it can be looked
+ * up by display drivers. The panel to be added must have been
+ * allocated by devm_drm_panel_alloc(). Unlike drm_panel_add() with this
+ * function there is no need to call drm_panel_remove(), it will be called
+ * automatically.
+ */
+int devm_drm_panel_add(struct device *dev, struct drm_panel *panel)
+{
+	drm_panel_add(panel);
+
+	return devm_add_action_or_reset(dev, drm_panel_add_release, panel);
+}
+EXPORT_SYMBOL(devm_drm_panel_add);
+
 /**
  * drm_panel_prepare - power on a panel
  * @panel: DRM panel
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 2407bfa60236..1fb9148dd095 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -329,6 +329,7 @@ void drm_panel_put(struct drm_panel *panel);
 
 void drm_panel_add(struct drm_panel *panel);
 void drm_panel_remove(struct drm_panel *panel);
+int devm_drm_panel_add(struct device *dev, struct drm_panel *panel);
 
 void drm_panel_prepare(struct drm_panel *panel);
 void drm_panel_unprepare(struct drm_panel *panel);

-- 
2.47.3

Re: [PATCH 16/19] drm/panel: add devm_drm_panel_add() helper

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Add devm_drm_panel_add(), devres-managed version of drm_panel_add().
> It's not uncommon for the panel drivers to use devres functions for most
> of the resources. Provide corresponding replacement for drm_panel_add().
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

[PATCH 17/19] drm/panel: add driver for Waveshare 8.8" DSI TOUCH-A panel

[Dmitry Baryshkov]

Add driver for the panel found on Waveshare 8.8" DSI TOUCH-A kit. It
uses ota7290b IC as a controller.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/Kconfig                    |  12 ++
 drivers/gpu/drm/panel/Makefile                   |   1 +
 drivers/gpu/drm/panel/panel-focaltech-ota7290b.c | 208 +++++++++++++++++++++++
 3 files changed, 221 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ba527b4d7737..979109c27b9b 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -144,6 +144,18 @@ config DRM_PANEL_FEIYANG_FY07024DI26A30D
 	  Say Y if you want to enable support for panels based on the
 	  Feiyang FY07024DI26A30-D MIPI-DSI interface.
 
+config DRM_PANEL_FOCALTECH_OTA7290B
+	tristate "Focaltech OTA7290B"
+	depends on DRM_MIPI_DSI
+	depends on I2C
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_KMS_HELPER
+	help
+	  Enable support for panels using OTA7290B as a controller (for
+	  example, Waveshare 12.3" DSI TOUCH-A panel). Say Y here if you want
+	  to enable support for this panel. To compile this driver as a module,
+	  choose M here.
+
 config DRM_PANEL_DSI_CM
 	tristate "Generic DSI command mode panels"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index a4291dc3905b..0d694acbfbb6 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_DRM_PANEL_EBBG_FT8719) += panel-ebbg-ft8719.o
 obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) += panel-elida-kd35t133.o
 obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) += panel-feixin-k101-im2ba02.o
 obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
+obj-$(CONFIG_DRM_PANEL_FOCALTECH_OTA7290B) += panel-focaltech-ota7290b.o
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX8279) += panel-himax-hx8279.o
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX83102) += panel-himax-hx83102.o
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX83112A) += panel-himax-hx83112a.o
diff --git a/drivers/gpu/drm/panel/panel-focaltech-ota7290b.c b/drivers/gpu/drm/panel/panel-focaltech-ota7290b.c
new file mode 100644
index 000000000000..991d6a4caf17
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-focaltech-ota7290b.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 Waveshare International Limited
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+struct ota7290b {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+
+	struct regulator *power;
+	struct gpio_desc *reset;
+	struct regulator *avdd;
+	struct regulator *iovcc;
+
+	enum drm_panel_orientation orientation;
+};
+
+static inline struct ota7290b *panel_to_ota(struct drm_panel *panel)
+{
+	return container_of(panel, struct ota7290b, panel);
+}
+
+static int ota7290b_prepare(struct drm_panel *panel)
+{
+	struct ota7290b *ctx = panel_to_ota(panel);
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+	int ret;
+
+	if (ctx->iovcc) {
+		ret = regulator_enable(ctx->iovcc);
+		if (ret)
+			dev_err(panel->dev, "failed to enable IO regulator: %d\n", ret);
+	}
+
+	if (ctx->avdd) {
+		ret = regulator_enable(ctx->avdd);
+		if (ret)
+			dev_err(panel->dev, "failed to enable AVDD regulator: %d\n", ret);
+	}
+
+	if (ctx->reset) {
+		gpiod_set_value_cansleep(ctx->reset, 0);
+		msleep(60);
+		gpiod_set_value_cansleep(ctx->reset, 1);
+		msleep(60);
+		gpiod_set_value_cansleep(ctx->reset, 0);
+		msleep(60);
+	}
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 50);
+
+	if (dsi_ctx.accum_err < 0)
+		dev_err(panel->dev, "failed to init panel: %d\n", ret);
+
+	return dsi_ctx.accum_err;
+}
+
+static int ota7290b_unprepare(struct drm_panel *panel)
+{
+	struct ota7290b *ctx = panel_to_ota(panel);
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+
+	if (ctx->reset) {
+		gpiod_set_value_cansleep(ctx->reset, 1);
+		msleep(5);
+	}
+
+	if (ctx->avdd)
+		regulator_disable(ctx->avdd);
+
+	if (ctx->iovcc)
+		regulator_disable(ctx->iovcc);
+
+	return 0;
+}
+
+static const struct drm_display_mode waveshare_dsi_touch_8_8_a_mode = {
+	.clock = 75000,
+
+	.hdisplay = 480,
+	.hsync_start = 480 + 50,
+	.hsync_end = 480 + 50 + 50,
+	.htotal = 480 + 50 + 50 + 50,
+
+	.vdisplay = 1920,
+	.vsync_start = 1920 + 20,
+	.vsync_end = 1920 + 20 + 20,
+	.vtotal = 1920 + 20 + 20 + 20,
+
+	.width_mm = 68,
+	.height_mm = 219,
+	.type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int ota7290b_get_modes(struct drm_panel *panel,
+			      struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &waveshare_dsi_touch_8_8_a_mode);
+}
+
+static enum drm_panel_orientation ota7290b_get_orientation(struct drm_panel *panel)
+{
+	struct ota7290b *ctx = panel_to_ota(panel);
+
+	return ctx->orientation;
+}
+
+static const struct drm_panel_funcs ota7290b_funcs = {
+	.prepare = ota7290b_prepare,
+	.unprepare = ota7290b_unprepare,
+	.get_modes = ota7290b_get_modes,
+	.get_orientation = ota7290b_get_orientation,
+};
+
+static int ota7290b_probe(struct mipi_dsi_device *dsi)
+{
+	struct ota7290b *ctx;
+	int ret;
+
+	ctx = devm_drm_panel_alloc(&dsi->dev, struct ota7290b, panel,
+				   &ota7290b_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (!ctx)
+		return -ENOMEM;
+	mipi_dsi_set_drvdata(dsi, ctx);
+	ctx->dsi = dsi;
+
+	ctx->reset = devm_gpiod_get_optional(&dsi->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ctx->reset))
+		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->reset),
+				     "Couldn't get our reset GPIO\n");
+
+	ctx->iovcc = devm_regulator_get_optional(&dsi->dev, "iovcc");
+	if (IS_ERR(ctx->iovcc))
+		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->iovcc),
+					"Couldn't get our iovcc supply\n");
+
+	ctx->avdd = devm_regulator_get_optional(&dsi->dev, "avdd");
+	if (IS_ERR(ctx->avdd))
+		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->avdd),
+					"Couldn't get our avdd supply\n");
+
+	ret = of_drm_get_panel_orientation(
+			dsi->dev.of_node, &ctx->orientation);
+	if (ret) {
+		dev_err(&dsi->dev, "%pOF: failed to get orientation: %d\n",
+			dsi->dev.of_node, ret);
+		return ret;
+	}
+
+	ret = drm_panel_of_backlight(&ctx->panel);
+	if (ret)
+		return ret;
+
+	ctx->panel.prepare_prev_first = true;
+
+	ret = devm_drm_panel_add(&dsi->dev, &ctx->panel);
+	if (ret)
+		return ret;
+
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_HSE |
+		MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS,
+	dsi->format = MIPI_DSI_FMT_RGB888,
+	dsi->lanes = 2;
+
+	return devm_mipi_dsi_attach(&dsi->dev, dsi);
+}
+
+static const struct of_device_id ota7290b_of_match[] = {
+	{ .compatible = "waveshare,8.8-dsi-touch-a", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ota7290b_of_match);
+
+static struct mipi_dsi_driver ota7290b_driver = {
+	.probe		= ota7290b_probe,
+	.driver = {
+		.name		= "focaltech-ota7290b",
+		.of_match_table	= ota7290b_of_match,
+	},
+};
+module_mipi_dsi_driver(ota7290b_driver);
+
+MODULE_DESCRIPTION("Panel driver for Focaltech OTA7290B panels");
+MODULE_LICENSE("GPL");

-- 
2.47.3

Re: [PATCH 17/19] drm/panel: add driver for Waveshare 8.8" DSI TOUCH-A panel

[Linus Walleij]

On Wed, Apr 1, 2026 at 9:27 AM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:

> Add driver for the panel found on Waveshare 8.8" DSI TOUCH-A kit. It
> uses ota7290b IC as a controller.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

[PATCH 18/19] dt-bindings: gpio: describe Waveshare GPIO controller

[Dmitry Baryshkov]

The Waveshare DSI TOUCH family of panels has separate on-board GPIO
controller, which controls power supplies to the panel and the touch
screen and provides reset pins for both the panel and the touchscreen.
Also it provides a simple PWM controller for panel backlight.

Add bindings for these GPIO controllers. As overall integration might be
not very obvious (and it differs significantly from the bindings used by
the original drivers), provide complete example with the on-board
regulators and the DSI panel.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 .../bindings/gpio/waveshare,dsi-touch-gpio.yaml    | 100 +++++++++++++++++++++
 1 file changed, 100 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/waveshare,dsi-touch-gpio.yaml b/Documentation/devicetree/bindings/gpio/waveshare,dsi-touch-gpio.yaml
new file mode 100644
index 000000000000..2e622b668f2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/waveshare,dsi-touch-gpio.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/waveshare,dsi-touch-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Waveshare GPIO controller on DSI TOUCH panels
+
+maintainers:
+  - Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
+
+description:
+  Waveshare DSI TOUCH panel kits contain separate GPIO controller for toggling
+  power supplies and panel / touchscreen resets.
+
+properties:
+  compatible:
+    const: waveshare,dsi-touch-gpio
+
+  reg:
+    maxItems: 1
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - "#gpio-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        wsgpio: gpio@45 {
+            compatible = "waveshare,dsi-touch-gpio";
+            reg = <0x45>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };
+
+    panel_avdd: regulator-panel-avdd {
+        compatible = "regulator-fixed";
+        regulator-name = "panel-avdd";
+        gpios = <&wsgpio 0 GPIO_ACTIVE_HIGH>;
+        enable-active-high;
+    };
+
+    panel_iovcc: regulator-panel-iovcc {
+        compatible = "regulator-fixed";
+        regulator-name = "panel-iovcc";
+        gpios = <&wsgpio 4 GPIO_ACTIVE_HIGH>;
+        enable-active-high;
+    };
+
+    panel_vcc: regulator-panel-vcc {
+        compatible = "regulator-fixed";
+        regulator-name = "panel-vcc";
+        gpios = <&wsgpio 8 GPIO_ACTIVE_HIGH>;
+        enable-active-high;
+        regulator-always-on;
+    };
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dsi_panel: dsi_panel@0 {
+            reg = <0>;
+            compatible = "waveshare,8.0-dsi-touch-a", "jadard,jd9365da-h3";
+            reset-gpio = <&wsgpio 1 GPIO_ACTIVE_LOW>;
+            vdd-supply = <&panel_avdd>;
+            iovcc-supply = <&panel_iovcc>;
+            backlight = <&wsgpio>;
+
+            port {
+                  panel_in: endpoint {
+                      remote-endpoint = <&dsi_out>;
+                  };
+            };
+        };
+
+        port {
+            dsi_out: endpoint {
+                data-lanes = <0 1 2 3>;
+                remote-endpoint = <&panel_in>;
+            };
+        };
+    };
+...

-- 
2.47.3

Re: [PATCH 18/19] dt-bindings: gpio: describe Waveshare GPIO controller

[Rob Herring (Arm)]

On Wed, 01 Apr 2026 10:26:37 +0300, Dmitry Baryshkov wrote:
> The Waveshare DSI TOUCH family of panels has separate on-board GPIO
> controller, which controls power supplies to the panel and the touch
> screen and provides reset pins for both the panel and the touchscreen.
> Also it provides a simple PWM controller for panel backlight.
> 
> Add bindings for these GPIO controllers. As overall integration might be
> not very obvious (and it differs significantly from the bindings used by
> the original drivers), provide complete example with the on-board
> regulators and the DSI panel.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  .../bindings/gpio/waveshare,dsi-touch-gpio.yaml    | 100 +++++++++++++++++++++
>  1 file changed, 100 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/gpio/waveshare,dsi-touch-gpio.example.dtb: dsi_panel@0 (waveshare,8.0-dsi-touch-a): 'iovcc-supply', 'reset-gpio' do not match any of the regexes: '^pinctrl-[0-9]+$'
	from schema $id: http://devicetree.org/schemas/display/panel/jadard,jd9365da-h3.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/gpio/waveshare,dsi-touch-gpio.example.dtb: dsi_panel@0 (waveshare,8.0-dsi-touch-a): 'vccio-supply' is a required property
	from schema $id: http://devicetree.org/schemas/display/panel/jadard,jd9365da-h3.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/gpio/waveshare,dsi-touch-gpio.example.dtb: dsi_panel@0 (waveshare,8.0-dsi-touch-a): 'reset-gpios' is a required property
	from schema $id: http://devicetree.org/schemas/display/panel/jadard,jd9365da-h3.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.kernel.org/project/devicetree/patch/20260401-waveshare-dsi-touch-v1-18-5e9119b5a014@oss.qualcomm.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

Re: [PATCH 18/19] dt-bindings: gpio: describe Waveshare GPIO controller

[Riccardo Mereu]

On Wed, 01 Apr 2026 10:26:37 +0300 Dmitry Baryshkov wrote:
>From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
>The Waveshare DSI TOUCH family of panels has separate on-board GPIO
>controller, which controls power supplies to the panel and the touch
>screen and provides reset pins for both the panel and the touchscreen.
>Also it provides a simple PWM controller for panel backlight.
>
>Add bindings for these GPIO controllers. As overall integration might be
>not very obvious (and it differs significantly from the bindings used by
>the original drivers), provide complete example with the on-board
>regulators and the DSI panel.
>
>Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Tested-by: Riccardo Mereu <r.mereu@arduino.cc>

[PATCH 19/19] gpio: add GPIO controller found on Waveshare DSI TOUCH panels

[Dmitry Baryshkov]

The Waveshare DSI TOUCH family of panels has separate on-board GPIO
controller, which controls power supplies to the panel and the touch
screen and provides reset pins for both the panel and the touchscreen.
Also it provides a simple PWM controller for panel backlight. Add
support for this GPIO controller.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpio/Kconfig              |  10 ++
 drivers/gpio/Makefile             |   1 +
 drivers/gpio/gpio-waveshare-dsi.c | 220 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 231 insertions(+)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 4c3f6ec336c1..f0bb5cdebf9b 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -804,6 +804,16 @@ config GPIO_VISCONTI
 	help
 	  Say yes here to support GPIO on Tohisba Visconti.
 
+config GPIO_WAVESHARE_DSI_TOUCH
+	tristate "Waveshare GPIO controller for DSI panels"
+	depends on BACKLIGHT_CLASS_DEVICE
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Enable support for the GPIO and PWM controller found on Waveshare DSI
+	  TOUCH panel kits. It provides GPIOs (used for regulator control and
+          resets) and backlight support.
+
 config GPIO_WCD934X
 	tristate "Qualcomm Technologies Inc WCD9340/WCD9341 GPIO controller driver"
 	depends on MFD_WCD934X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 20d4a57afdaa..75ce89fc3b93 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -207,6 +207,7 @@ obj-$(CONFIG_GPIO_VIRTUSER)		+= gpio-virtuser.o
 obj-$(CONFIG_GPIO_VIRTIO)		+= gpio-virtio.o
 obj-$(CONFIG_GPIO_VISCONTI)		+= gpio-visconti.o
 obj-$(CONFIG_GPIO_VX855)		+= gpio-vx855.o
+obj-$(CONFIG_GPIO_WAVESHARE_DSI_TOUCH)	+= gpio-waveshare-dsi.o
 obj-$(CONFIG_GPIO_WCD934X)		+= gpio-wcd934x.o
 obj-$(CONFIG_GPIO_WHISKEY_COVE)		+= gpio-wcove.o
 obj-$(CONFIG_GPIO_WINBOND)		+= gpio-winbond.o
diff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c
new file mode 100644
index 000000000000..30fe7569c150
--- /dev/null
+++ b/drivers/gpio/gpio-waveshare-dsi.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 Waveshare International Limited
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+/* I2C registers of the microcontroller. */
+#define REG_TP		0x94
+#define REG_LCD		0x95
+#define REG_PWM		0x96
+#define REG_SIZE	0x97
+#define REG_ID		0x98
+#define REG_VERSION	0x99
+
+enum {
+	GPIO_AVDD = 0,
+	GPIO_PANEL_RESET = 1,
+	GPIO_BL_ENABLE = 2,
+	GPIO_IOVCC = 4,
+	GPIO_VCC = 8,
+	GPIO_TS_RESET = 9,
+	NUM_GPIO = 16,
+};
+
+struct waveshare_gpio {
+	struct mutex dir_lock;
+	struct mutex pwr_lock;
+	struct regmap *regmap;
+	u16 poweron_state;
+
+	struct gpio_chip gc;
+};
+
+static const struct regmap_config waveshare_gpio_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = REG_PWM,
+};
+
+static int waveshare_gpio_get(struct waveshare_gpio *state, unsigned int offset)
+{
+	u16 pwr_state;
+
+	mutex_lock(&state->pwr_lock);
+	pwr_state = state->poweron_state & BIT(offset);
+	mutex_unlock(&state->pwr_lock);
+
+	return !!pwr_state;
+}
+
+static int waveshare_gpio_set(struct waveshare_gpio *state, unsigned int offset, int value)
+{
+	u16 last_val;
+
+	mutex_lock(&state->pwr_lock);
+
+	last_val = state->poweron_state;
+	if (value)
+		last_val |= BIT(offset);
+	else
+		last_val &= ~BIT(offset);
+
+	state->poweron_state = last_val;
+
+	regmap_write(state->regmap, REG_TP, last_val >> 8);
+	regmap_write(state->regmap, REG_LCD, last_val & 0xff);
+
+	mutex_unlock(&state->pwr_lock);
+
+	return 0;
+}
+
+static int waveshare_gpio_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+	return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int waveshare_gpio_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+	struct waveshare_gpio *state = gpiochip_get_data(gc);
+
+	return waveshare_gpio_get(state, offset);
+}
+
+static int waveshare_gpio_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+	struct waveshare_gpio *state = gpiochip_get_data(gc);
+
+	return waveshare_gpio_set(state, offset, value);
+}
+
+static int waveshare_gpio_update_status(struct backlight_device *bl)
+{
+	struct waveshare_gpio *state = bl_get_data(bl);
+	int brightness = backlight_get_brightness(bl);
+
+	waveshare_gpio_set(state, GPIO_BL_ENABLE, brightness);
+
+	return regmap_write(state->regmap, REG_PWM, brightness);
+}
+
+static const struct backlight_ops waveshare_gpio_bl = {
+	.update_status = waveshare_gpio_update_status,
+};
+
+static int waveshare_gpio_i2c_read(struct i2c_client *client, u8 reg, unsigned int *buf)
+{
+	int val;
+
+	val = i2c_smbus_read_byte_data(client, reg);
+	if (val < 0)
+		return val;
+
+	*buf = val;
+
+	return 0;
+}
+
+static int waveshare_gpio_probe(struct i2c_client *i2c)
+{
+	struct backlight_properties props = {};
+	struct waveshare_gpio *state;
+	struct device *dev = &i2c->dev;
+	struct backlight_device *bl;
+	struct regmap *regmap;
+	unsigned int data;
+	int ret;
+
+	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return -ENOMEM;
+
+	ret = devm_mutex_init(dev, &state->dir_lock);
+	if (ret)
+		return ret;
+
+	ret = devm_mutex_init(dev, &state->pwr_lock);
+	if (ret)
+		return ret;
+
+	i2c_set_clientdata(i2c, state);
+
+	regmap = devm_regmap_init_i2c(i2c, &waveshare_gpio_regmap_config);
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to allocate register map\n");
+
+	ret = waveshare_gpio_i2c_read(i2c, REG_ID, &data);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to read register\n");
+
+	dev_dbg(dev, "waveshare panel hw id = 0x%x\n", data);
+
+	ret = waveshare_gpio_i2c_read(i2c, REG_SIZE, &data);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to read register\n");
+
+	dev_dbg(dev, "waveshare panel size = %d\n", data);
+
+	ret = waveshare_gpio_i2c_read(i2c, REG_VERSION, &data);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to read register\n");
+
+	dev_dbg(dev, "waveshare panel mcu version = 0x%x\n", data);
+
+	state->poweron_state = BIT(GPIO_TS_RESET);
+	regmap_write(regmap, REG_TP, state->poweron_state >> 8);
+	regmap_write(regmap, REG_LCD, state->poweron_state & 0xff);
+	msleep(20);
+
+	state->regmap = regmap;
+	state->gc.parent = dev;
+	state->gc.label = i2c->name;
+	state->gc.owner = THIS_MODULE;
+	state->gc.base = -1;
+	state->gc.ngpio = NUM_GPIO;
+
+	/* it is output only */
+	state->gc.get = waveshare_gpio_gpio_get;
+	state->gc.set = waveshare_gpio_gpio_set;
+	state->gc.get_direction = waveshare_gpio_gpio_get_direction;
+	state->gc.can_sleep = true;
+
+	ret = devm_gpiochip_add_data(dev, &state->gc, state);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to create gpiochip\n");
+
+	props.type = BACKLIGHT_RAW;
+	props.max_brightness = 255;
+	props.brightness = 255;
+	bl = devm_backlight_device_register(dev, dev_name(dev), dev, state,
+					    &waveshare_gpio_bl, &props);
+	return PTR_ERR_OR_ZERO(bl);
+}
+
+static const struct of_device_id waveshare_gpio_dt_ids[] = {
+	{ .compatible = "waveshare,dsi-touch-gpio" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, waveshare_gpio_dt_ids);
+
+static struct i2c_driver waveshare_gpio_regulator_driver = {
+	.driver = {
+		.name = "waveshare-regulator",
+		.of_match_table = of_match_ptr(waveshare_gpio_dt_ids),
+	},
+	.probe = waveshare_gpio_probe,
+};
+
+module_i2c_driver(waveshare_gpio_regulator_driver);
+
+MODULE_DESCRIPTION("GPIO controller driver for Waveshare DSI touch panels");
+MODULE_LICENSE("GPL");

-- 
2.47.3

Re: [PATCH 19/19] gpio: add GPIO controller found on Waveshare DSI TOUCH panels

[Bartosz Golaszewski]

On Wed, 1 Apr 2026 09:26:38 +0200, Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> said:
> The Waveshare DSI TOUCH family of panels has separate on-board GPIO
> controller, which controls power supplies to the panel and the touch
> screen and provides reset pins for both the panel and the touchscreen.
> Also it provides a simple PWM controller for panel backlight. Add
> support for this GPIO controller.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  drivers/gpio/Kconfig              |  10 ++
>  drivers/gpio/Makefile             |   1 +
>  drivers/gpio/gpio-waveshare-dsi.c | 220 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 231 insertions(+)
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 4c3f6ec336c1..f0bb5cdebf9b 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -804,6 +804,16 @@ config GPIO_VISCONTI
>  	help
>  	  Say yes here to support GPIO on Tohisba Visconti.
>
> +config GPIO_WAVESHARE_DSI_TOUCH
> +	tristate "Waveshare GPIO controller for DSI panels"
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +	  Enable support for the GPIO and PWM controller found on Waveshare DSI
> +	  TOUCH panel kits. It provides GPIOs (used for regulator control and
> +          resets) and backlight support.
> +
>  config GPIO_WCD934X
>  	tristate "Qualcomm Technologies Inc WCD9340/WCD9341 GPIO controller driver"
>  	depends on MFD_WCD934X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 20d4a57afdaa..75ce89fc3b93 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -207,6 +207,7 @@ obj-$(CONFIG_GPIO_VIRTUSER)		+= gpio-virtuser.o
>  obj-$(CONFIG_GPIO_VIRTIO)		+= gpio-virtio.o
>  obj-$(CONFIG_GPIO_VISCONTI)		+= gpio-visconti.o
>  obj-$(CONFIG_GPIO_VX855)		+= gpio-vx855.o
> +obj-$(CONFIG_GPIO_WAVESHARE_DSI_TOUCH)	+= gpio-waveshare-dsi.o
>  obj-$(CONFIG_GPIO_WCD934X)		+= gpio-wcd934x.o
>  obj-$(CONFIG_GPIO_WHISKEY_COVE)		+= gpio-wcove.o
>  obj-$(CONFIG_GPIO_WINBOND)		+= gpio-winbond.o
> diff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c
> new file mode 100644
> index 000000000000..30fe7569c150
> --- /dev/null
> +++ b/drivers/gpio/gpio-waveshare-dsi.c
> @@ -0,0 +1,220 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2024 Waveshare International Limited
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/err.h>
> +#include <linux/fb.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +
> +/* I2C registers of the microcontroller. */
> +#define REG_TP		0x94
> +#define REG_LCD		0x95
> +#define REG_PWM		0x96
> +#define REG_SIZE	0x97
> +#define REG_ID		0x98
> +#define REG_VERSION	0x99
> +
> +enum {
> +	GPIO_AVDD = 0,
> +	GPIO_PANEL_RESET = 1,
> +	GPIO_BL_ENABLE = 2,
> +	GPIO_IOVCC = 4,
> +	GPIO_VCC = 8,
> +	GPIO_TS_RESET = 9,
> +	NUM_GPIO = 16,

Why is this part of an enum?

> +};
> +
> +struct waveshare_gpio {
> +	struct mutex dir_lock;
> +	struct mutex pwr_lock;
> +	struct regmap *regmap;
> +	u16 poweron_state;
> +
> +	struct gpio_chip gc;
> +};
> +
> +static const struct regmap_config waveshare_gpio_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = REG_PWM,
> +};
> +
> +static int waveshare_gpio_get(struct waveshare_gpio *state, unsigned int offset)
> +{
> +	u16 pwr_state;
> +
> +	mutex_lock(&state->pwr_lock);
> +	pwr_state = state->poweron_state & BIT(offset);
> +	mutex_unlock(&state->pwr_lock);
> +
> +	return !!pwr_state;
> +}
> +
> +static int waveshare_gpio_set(struct waveshare_gpio *state, unsigned int offset, int value)
> +{
> +	u16 last_val;
> +
> +	mutex_lock(&state->pwr_lock);

Can you use guards for locks?

> +
> +	last_val = state->poweron_state;
> +	if (value)
> +		last_val |= BIT(offset);
> +	else
> +		last_val &= ~BIT(offset);
> +
> +	state->poweron_state = last_val;
> +
> +	regmap_write(state->regmap, REG_TP, last_val >> 8);
> +	regmap_write(state->regmap, REG_LCD, last_val & 0xff);

I2C regmap writes can fail and their return value should be checked.

> +
> +	mutex_unlock(&state->pwr_lock);
> +
> +	return 0;
> +}
> +
> +static int waveshare_gpio_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
> +{
> +	return GPIO_LINE_DIRECTION_OUT;
> +}
> +
> +static int waveshare_gpio_gpio_get(struct gpio_chip *gc, unsigned int offset)
> +{
> +	struct waveshare_gpio *state = gpiochip_get_data(gc);
> +
> +	return waveshare_gpio_get(state, offset);
> +}
> +
> +static int waveshare_gpio_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
> +{
> +	struct waveshare_gpio *state = gpiochip_get_data(gc);
> +
> +	return waveshare_gpio_set(state, offset, value);
> +}
> +
> +static int waveshare_gpio_update_status(struct backlight_device *bl)
> +{
> +	struct waveshare_gpio *state = bl_get_data(bl);
> +	int brightness = backlight_get_brightness(bl);
> +
> +	waveshare_gpio_set(state, GPIO_BL_ENABLE, brightness);
> +
> +	return regmap_write(state->regmap, REG_PWM, brightness);
> +}
> +
> +static const struct backlight_ops waveshare_gpio_bl = {
> +	.update_status = waveshare_gpio_update_status,
> +};
> +
> +static int waveshare_gpio_i2c_read(struct i2c_client *client, u8 reg, unsigned int *buf)
> +{
> +	int val;
> +
> +	val = i2c_smbus_read_byte_data(client, reg);
> +	if (val < 0)
> +		return val;
> +
> +	*buf = val;
> +
> +	return 0;
> +}
> +
> +static int waveshare_gpio_probe(struct i2c_client *i2c)
> +{
> +	struct backlight_properties props = {};
> +	struct waveshare_gpio *state;
> +	struct device *dev = &i2c->dev;
> +	struct backlight_device *bl;
> +	struct regmap *regmap;
> +	unsigned int data;
> +	int ret;
> +
> +	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
> +	if (!state)
> +		return -ENOMEM;
> +
> +	ret = devm_mutex_init(dev, &state->dir_lock);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_mutex_init(dev, &state->pwr_lock);
> +	if (ret)
> +		return ret;
> +
> +	i2c_set_clientdata(i2c, state);
> +
> +	regmap = devm_regmap_init_i2c(i2c, &waveshare_gpio_regmap_config);
> +	if (IS_ERR(regmap))
> +		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to allocate register map\n");
> +
> +	ret = waveshare_gpio_i2c_read(i2c, REG_ID, &data);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to read register\n");
> +
> +	dev_dbg(dev, "waveshare panel hw id = 0x%x\n", data);
> +
> +	ret = waveshare_gpio_i2c_read(i2c, REG_SIZE, &data);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to read register\n");
> +
> +	dev_dbg(dev, "waveshare panel size = %d\n", data);
> +
> +	ret = waveshare_gpio_i2c_read(i2c, REG_VERSION, &data);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to read register\n");
> +
> +	dev_dbg(dev, "waveshare panel mcu version = 0x%x\n", data);
> +
> +	state->poweron_state = BIT(GPIO_TS_RESET);
> +	regmap_write(regmap, REG_TP, state->poweron_state >> 8);
> +	regmap_write(regmap, REG_LCD, state->poweron_state & 0xff);
> +	msleep(20);
> +
> +	state->regmap = regmap;
> +	state->gc.parent = dev;
> +	state->gc.label = i2c->name;
> +	state->gc.owner = THIS_MODULE;
> +	state->gc.base = -1;
> +	state->gc.ngpio = NUM_GPIO;
> +
> +	/* it is output only */
> +	state->gc.get = waveshare_gpio_gpio_get;
> +	state->gc.set = waveshare_gpio_gpio_set;
> +	state->gc.get_direction = waveshare_gpio_gpio_get_direction;
> +	state->gc.can_sleep = true;
> +
> +	ret = devm_gpiochip_add_data(dev, &state->gc, state);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to create gpiochip\n");
> +

This driver looks like it could be easily converted to use gpio-regmap and
become much shorter in the process. Could you please take a look at
linux/gpio/regmap.h?

> +	props.type = BACKLIGHT_RAW;
> +	props.max_brightness = 255;
> +	props.brightness = 255;
> +	bl = devm_backlight_device_register(dev, dev_name(dev), dev, state,
> +					    &waveshare_gpio_bl, &props);
> +	return PTR_ERR_OR_ZERO(bl);
> +}
> +
> +static const struct of_device_id waveshare_gpio_dt_ids[] = {
> +	{ .compatible = "waveshare,dsi-touch-gpio" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, waveshare_gpio_dt_ids);
> +
> +static struct i2c_driver waveshare_gpio_regulator_driver = {
> +	.driver = {
> +		.name = "waveshare-regulator",
> +		.of_match_table = of_match_ptr(waveshare_gpio_dt_ids),
> +	},
> +	.probe = waveshare_gpio_probe,
> +};
> +
> +module_i2c_driver(waveshare_gpio_regulator_driver);
> +
> +MODULE_DESCRIPTION("GPIO controller driver for Waveshare DSI touch panels");
> +MODULE_LICENSE("GPL");
>
> --
> 2.47.3
>
>

Bart

Re: [PATCH 19/19] gpio: add GPIO controller found on Waveshare DSI TOUCH panels

[Dmitry Baryshkov]

On Fri, Apr 03, 2026 at 08:30:22AM -0400, Bartosz Golaszewski wrote:
> On Wed, 1 Apr 2026 09:26:38 +0200, Dmitry Baryshkov
> <dmitry.baryshkov@oss.qualcomm.com> said:
> > The Waveshare DSI TOUCH family of panels has separate on-board GPIO
> > controller, which controls power supplies to the panel and the touch
> > screen and provides reset pins for both the panel and the touchscreen.
> > Also it provides a simple PWM controller for panel backlight. Add
> > support for this GPIO controller.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> > ---
> >  drivers/gpio/Kconfig              |  10 ++
> >  drivers/gpio/Makefile             |   1 +
> >  drivers/gpio/gpio-waveshare-dsi.c | 220 ++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 231 insertions(+)
> >
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index 4c3f6ec336c1..f0bb5cdebf9b 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -804,6 +804,16 @@ config GPIO_VISCONTI
> >  	help
> >  	  Say yes here to support GPIO on Tohisba Visconti.
> >
> > +config GPIO_WAVESHARE_DSI_TOUCH
> > +	tristate "Waveshare GPIO controller for DSI panels"
> > +	depends on BACKLIGHT_CLASS_DEVICE
> > +	depends on I2C
> > +	select REGMAP_I2C
> > +	help
> > +	  Enable support for the GPIO and PWM controller found on Waveshare DSI
> > +	  TOUCH panel kits. It provides GPIOs (used for regulator control and
> > +          resets) and backlight support.
> > +
> >  config GPIO_WCD934X
> >  	tristate "Qualcomm Technologies Inc WCD9340/WCD9341 GPIO controller driver"
> >  	depends on MFD_WCD934X
> > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> > index 20d4a57afdaa..75ce89fc3b93 100644
> > --- a/drivers/gpio/Makefile
> > +++ b/drivers/gpio/Makefile
> > @@ -207,6 +207,7 @@ obj-$(CONFIG_GPIO_VIRTUSER)		+= gpio-virtuser.o
> >  obj-$(CONFIG_GPIO_VIRTIO)		+= gpio-virtio.o
> >  obj-$(CONFIG_GPIO_VISCONTI)		+= gpio-visconti.o
> >  obj-$(CONFIG_GPIO_VX855)		+= gpio-vx855.o
> > +obj-$(CONFIG_GPIO_WAVESHARE_DSI_TOUCH)	+= gpio-waveshare-dsi.o
> >  obj-$(CONFIG_GPIO_WCD934X)		+= gpio-wcd934x.o
> >  obj-$(CONFIG_GPIO_WHISKEY_COVE)		+= gpio-wcove.o
> >  obj-$(CONFIG_GPIO_WINBOND)		+= gpio-winbond.o
> > diff --git a/drivers/gpio/gpio-waveshare-dsi.c b/drivers/gpio/gpio-waveshare-dsi.c
> > new file mode 100644
> > index 000000000000..30fe7569c150
> > --- /dev/null
> > +++ b/drivers/gpio/gpio-waveshare-dsi.c
> > @@ -0,0 +1,220 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2024 Waveshare International Limited
> > + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> > + */
> > +
> > +#include <linux/backlight.h>
> > +#include <linux/err.h>
> > +#include <linux/fb.h>
> > +#include <linux/gpio/driver.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/regmap.h>
> > +
> > +/* I2C registers of the microcontroller. */
> > +#define REG_TP		0x94
> > +#define REG_LCD		0x95
> > +#define REG_PWM		0x96
> > +#define REG_SIZE	0x97
> > +#define REG_ID		0x98
> > +#define REG_VERSION	0x99
> > +
> > +enum {
> > +	GPIO_AVDD = 0,
> > +	GPIO_PANEL_RESET = 1,
> > +	GPIO_BL_ENABLE = 2,
> > +	GPIO_IOVCC = 4,
> > +	GPIO_VCC = 8,
> > +	GPIO_TS_RESET = 9,
> > +	NUM_GPIO = 16,
> 
> Why is this part of an enum?

I'll move this out of the enum.

> 
> > +static int waveshare_gpio_set(struct waveshare_gpio *state, unsigned int offset, int value)
> > +{
> > +	u16 last_val;
> > +
> > +	mutex_lock(&state->pwr_lock);
> 
> Can you use guards for locks?

Yes

> 
> > +
> > +	last_val = state->poweron_state;
> > +	if (value)
> > +		last_val |= BIT(offset);
> > +	else
> > +		last_val &= ~BIT(offset);
> > +
> > +	state->poweron_state = last_val;
> > +
> > +	regmap_write(state->regmap, REG_TP, last_val >> 8);
> > +	regmap_write(state->regmap, REG_LCD, last_val & 0xff);
> 
> I2C regmap writes can fail and their return value should be checked.

Ack.

> 
> > +
> > +	mutex_unlock(&state->pwr_lock);
> > +
> > +	return 0;
> > +}
> > +

[...]

> > +
> > +static int waveshare_gpio_update_status(struct backlight_device *bl)
> > +{
> > +	struct waveshare_gpio *state = bl_get_data(bl);
> > +	int brightness = backlight_get_brightness(bl);
> > +
> > +	waveshare_gpio_set(state, GPIO_BL_ENABLE, brightness);
> > +
> > +	return regmap_write(state->regmap, REG_PWM, brightness);
> > +}
> > +

[...]

> > +static int waveshare_gpio_probe(struct i2c_client *i2c)
> > +{

[...]
> > +
> > +	dev_dbg(dev, "waveshare panel mcu version = 0x%x\n", data);
> > +
> > +	state->poweron_state = BIT(GPIO_TS_RESET);
> > +	regmap_write(regmap, REG_TP, state->poweron_state >> 8);
> > +	regmap_write(regmap, REG_LCD, state->poweron_state & 0xff);

And this can become waveshare_gpio_set().

> > +	msleep(20);
> > +
> > +	state->regmap = regmap;
> > +	state->gc.parent = dev;
> > +	state->gc.label = i2c->name;
> > +	state->gc.owner = THIS_MODULE;
> > +	state->gc.base = -1;
> > +	state->gc.ngpio = NUM_GPIO;
> > +
> > +	/* it is output only */
> > +	state->gc.get = waveshare_gpio_gpio_get;
> > +	state->gc.set = waveshare_gpio_gpio_set;
> > +	state->gc.get_direction = waveshare_gpio_gpio_get_direction;
> > +	state->gc.can_sleep = true;
> > +
> > +	ret = devm_gpiochip_add_data(dev, &state->gc, state);
> > +	if (ret)
> > +		return dev_err_probe(dev, ret, "Failed to create gpiochip\n");
> > +
> 
> This driver looks like it could be easily converted to use gpio-regmap and
> become much shorter in the process. Could you please take a look at
> linux/gpio/regmap.h?

I took a glance. It is a nice wrapper, but I think being able to call
waveshare_gpio_set() internally without extra troubles overweights the
bonuses of the wrapper. Also, I'd agree if there were extra complexity
here (e.g. the stride or the in/out handling), but having just the out
GPIOs doesn't seem to warrant it.

An alternative would be to split away the backlight into a separate
pwm-backlight device. Then having waveshare_gpio_set() isn't that
important and thus I could switch to GPIO_REGMAP. But then... We don't
have real control over the PWM. We are really programming some values,
with the actual PWM duty cycle calculations being handled internally.

With all that in mind, unless you really insist, I'd prefer to leave
this part the driver as is.

> 
> > +	props.type = BACKLIGHT_RAW;
> > +	props.max_brightness = 255;
> > +	props.brightness = 255;
> > +	bl = devm_backlight_device_register(dev, dev_name(dev), dev, state,
> > +					    &waveshare_gpio_bl, &props);
> > +	return PTR_ERR_OR_ZERO(bl);
> > +}
> > +

-- 
With best wishes
Dmitry

Re: [PATCH 19/19] gpio: add GPIO controller found on Waveshare DSI TOUCH panels

[Riccardo Mereu]

On Wed, 01 Apr 2026 10:26:38 +0300 Dmitry Baryshkov wrote:
>From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
>The Waveshare DSI TOUCH family of panels has separate on-board GPIO
>controller, which controls power supplies to the panel and the touch
>screen and provides reset pins for both the panel and the touchscreen.
>Also it provides a simple PWM controller for panel backlight. Add
>support for this GPIO controller.
>
>Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Tested-by: Riccardo Mereu <r.mereu@arduino.cc>