[PATCH v2 0/2] drm/panel: Add panel driver for ChipWealth CH13726A based panels

[PATCH v2 0/2] drm/panel: Add panel driver for ChipWealth CH13726A based panels

[Aaron Kling via B4 Relay]

This driver is based on the one by Teguh Sobirin [0], cut down to only
support the AYN Thor bottom panel.

[0] https://github.com/AYNTechnologies/linux/commit/d0ff75b09e66023c5f88992706dee4601aa7a437

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
---
Changes in v2:
- Add Neil Armstrong to binding maintainer list
- Add 120hz mode, which required a minor restructure of the driver
- Link to v1: https://lore.kernel.org/r/20260222-ch13726a-v1-0-e501d78e105a@gmail.com

---
Aaron Kling (1):
      dt-bindings: display: panel: Add ChipWealth CH13726A AMOLED driver bindings

Teguh Sobirin (1):
      drm/panel: Add panel driver for ChipWealth CH13726A based panels

 .../display/panel/chipwealth,ch13726a.yaml         |  66 ++++
 drivers/gpu/drm/panel/Kconfig                      |  11 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c  | 339 +++++++++++++++++++++
 4 files changed, 417 insertions(+)
---
base-commit: 95c541ddfb0815a0ea8477af778bb13bb075079a
change-id: 20260220-ch13726a-59c6678d53d8
prerequisite-change-id: 20260220-ayn-vendor-a153168c29b2:v1
prerequisite-patch-id: 042cab8f04748207ba5395dd0f23c445955aaa2b

Best regards,
-- 
Aaron Kling <webgeek1234@gmail.com>

[PATCH v2 1/2] dt-bindings: display: panel: Add ChipWealth CH13726A AMOLED driver bindings

[Aaron Kling via B4 Relay]

From: Aaron Kling <webgeek1234@gmail.com>

The Chip Wealth Technology CH13726A display driver is a single chip
solution for AMOLED using MIPI-DSI. This is used for the AYN Thor bottom
panel.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
---
 .../display/panel/chipwealth,ch13726a.yaml         | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..b490c6757bb98c0752ded78b8fea3aaec853c7b2
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/chipwealth,ch13726a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Chip Wealth Technology CH13726A display driver
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+
+description:
+  Chip Wealth Technology CH13726A is a single-chip solution
+  for AMOLED connected using a MIPI-DSI video interface.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: ayntec,thor-panel-bottom
+
+  port: true
+  reg:
+    maxItems: 1
+    description: DSI virtual channel
+
+  vdd-supply: true
+  vddio-supply: true
+  vdd1v2-supply: true
+  avdd-supply: true
+
+  reset-gpios: true
+
+  rotation: true
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - vddio-supply
+  - vdd1v2-supply
+  - avdd-supply
+  - reset-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        panel@0 {
+            compatible = "ayntec,thor-panel-bottom";
+            reg = <0>;
+            vdd1v2-supply = <&vreg_l11b_1p2>;
+            vddio-supply = <&vdd_disp_1v8>;
+            vdd-supply = <&vreg_l13b_3p0>;
+            avdd-supply = <&vdd_disp2_2v8>;
+            reset-gpios = <&tlmm 133 GPIO_ACTIVE_HIGH>;
+        };
+    };
+
+...

-- 
2.53.0

Re: [PATCH v2 1/2] dt-bindings: display: panel: Add ChipWealth CH13726A AMOLED driver bindings

[Krzysztof Kozlowski]

On Tue, Mar 17, 2026 at 12:23:07AM -0500, Aaron Kling wrote:
> The Chip Wealth Technology CH13726A display driver is a single chip
> solution for AMOLED using MIPI-DSI. This is used for the AYN Thor bottom
> panel.

A nit, subject: drop second/last, redundant "bindings". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

Also drop all references to "display driver", even if you meant hardware
thing.  Driver in hardware is suitable only to motors, haptics and LEDs,
but not to displays. AMOLED driver is fine, display driver too confusing.


> 
> Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
> ---
>  .../display/panel/chipwealth,ch13726a.yaml         | 66 ++++++++++++++++++++++
>  1 file changed, 66 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..b490c6757bb98c0752ded78b8fea3aaec853c7b2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/chipwealth,ch13726a.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Chip Wealth Technology CH13726A display driver
> +
> +maintainers:
> +  - Neil Armstrong <neil.armstrong@linaro.org>
> +
> +description:
> +  Chip Wealth Technology CH13726A is a single-chip solution
> +  for AMOLED connected using a MIPI-DSI video interface.
> +
> +allOf:
> +  - $ref: panel-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: ayntec,thor-panel-bottom

Why compatible is completely different than commit msg, description and
title are saying?

> +
> +  port: true

This goes before reset-gpios

> +  reg:
> +    maxItems: 1
> +    description: DSI virtual channel
> +
> +  vdd-supply: true
> +  vddio-supply: true
> +  vdd1v2-supply: true
> +  avdd-supply: true
> +
> +  reset-gpios: true
> +

Drop blank line here (it is port+reset-gpios+rotation in three lines).


> +  rotation: true
> +

Best regards,
Krzysztof

Re: [PATCH v2 1/2] dt-bindings: display: panel: Add ChipWealth CH13726A AMOLED driver bindings

[Aaron Kling]

On Tue, Mar 17, 2026 at 2:33 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Tue, Mar 17, 2026 at 12:23:07AM -0500, Aaron Kling wrote:
> > The Chip Wealth Technology CH13726A display driver is a single chip
> > solution for AMOLED using MIPI-DSI. This is used for the AYN Thor bottom
> > panel.
>
> A nit, subject: drop second/last, redundant "bindings". The
> "dt-bindings" prefix is already stating that these are bindings.
> See also:
> https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

Ack

> Also drop all references to "display driver", even if you meant hardware
> thing.  Driver in hardware is suitable only to motors, haptics and LEDs,
> but not to displays. AMOLED driver is fine, display driver too confusing.

Per the data sheet [0], my understanding is that the ch13726 is a
ddic, a display driver integrated circuit, which is a class of generic
chip that gets bundled with multiple panels. This data sheet doesn't
use the specific term ddic, but others I'm working on do and the term
crept across for consistency. I can change the description to avoid
confusion, Is 'AMOLED driver' enough to imply that this is a common
chip supporting multiple panels?

> >
> > Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
> > ---
> >  .../display/panel/chipwealth,ch13726a.yaml         | 66 ++++++++++++++++++++++
> >  1 file changed, 66 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..b490c6757bb98c0752ded78b8fea3aaec853c7b2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
> > @@ -0,0 +1,66 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/panel/chipwealth,ch13726a.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Chip Wealth Technology CH13726A display driver
> > +
> > +maintainers:
> > +  - Neil Armstrong <neil.armstrong@linaro.org>
> > +
> > +description:
> > +  Chip Wealth Technology CH13726A is a single-chip solution
> > +  for AMOLED connected using a MIPI-DSI video interface.
> > +
> > +allOf:
> > +  - $ref: panel-common.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: ayntec,thor-panel-bottom
>
> Why compatible is completely different than commit msg, description and
> title are saying?

See above for the general explanation. I don't know what the panel
part number for this is, the only thing the odm described was the
ddic. So I'm describing where the panel is used. There is precedence
for this, for example rocktech,jh057n00900 containing
gameforce,chi-panel. The downstream driver code I based on also
supports displays from retroidpocket, so I'm also trying to leave a
simple path for those to be added, should someone care to.

> > +
> > +  port: true
>
> This goes before reset-gpios

Ack

> > +  reg:
> > +    maxItems: 1
> > +    description: DSI virtual channel
> > +
> > +  vdd-supply: true
> > +  vddio-supply: true
> > +  vdd1v2-supply: true
> > +  avdd-supply: true
> > +
> > +  reset-gpios: true
> > +
>
> Drop blank line here (it is port+reset-gpios+rotation in three lines).

Ack

>
> > +  rotation: true
> > +
>
> Best regards,
> Krzysztof
>
Aaron

Re: [PATCH v2 1/2] dt-bindings: display: panel: Add ChipWealth CH13726A AMOLED driver bindings

[Aaron Kling]

On Tue, Mar 17, 2026 at 12:59 PM Aaron Kling <webgeek1234@gmail.com> wrote:
>
> On Tue, Mar 17, 2026 at 2:33 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> >
> > On Tue, Mar 17, 2026 at 12:23:07AM -0500, Aaron Kling wrote:
> > > The Chip Wealth Technology CH13726A display driver is a single chip
> > > solution for AMOLED using MIPI-DSI. This is used for the AYN Thor bottom
> > > panel.
> >
> > A nit, subject: drop second/last, redundant "bindings". The
> > "dt-bindings" prefix is already stating that these are bindings.
> > See also:
> > https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18
>
> Ack
>
> > Also drop all references to "display driver", even if you meant hardware
> > thing.  Driver in hardware is suitable only to motors, haptics and LEDs,
> > but not to displays. AMOLED driver is fine, display driver too confusing.
>
> Per the data sheet [0], my understanding is that the ch13726 is a
> ddic, a display driver integrated circuit, which is a class of generic
> chip that gets bundled with multiple panels. This data sheet doesn't
> use the specific term ddic, but others I'm working on do and the term
> crept across for consistency. I can change the description to avoid
> confusion, Is 'AMOLED driver' enough to imply that this is a common
> chip supporting multiple panels?

Sorry, forgot to actually paste the link [0] in my last reply. Adding now.

> > >
> > > Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
> > > ---
> > >  .../display/panel/chipwealth,ch13726a.yaml         | 66 ++++++++++++++++++++++
> > >  1 file changed, 66 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
> > > new file mode 100644
> > > index 0000000000000000000000000000000000000000..b490c6757bb98c0752ded78b8fea3aaec853c7b2
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/display/panel/chipwealth,ch13726a.yaml
> > > @@ -0,0 +1,66 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/display/panel/chipwealth,ch13726a.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Chip Wealth Technology CH13726A display driver
> > > +
> > > +maintainers:
> > > +  - Neil Armstrong <neil.armstrong@linaro.org>
> > > +
> > > +description:
> > > +  Chip Wealth Technology CH13726A is a single-chip solution
> > > +  for AMOLED connected using a MIPI-DSI video interface.
> > > +
> > > +allOf:
> > > +  - $ref: panel-common.yaml#
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: ayntec,thor-panel-bottom
> >
> > Why compatible is completely different than commit msg, description and
> > title are saying?
>
> See above for the general explanation. I don't know what the panel
> part number for this is, the only thing the odm described was the
> ddic. So I'm describing where the panel is used. There is precedence
> for this, for example rocktech,jh057n00900 containing
> gameforce,chi-panel. The downstream driver code I based on also
> supports displays from retroidpocket, so I'm also trying to leave a
> simple path for those to be added, should someone care to.
>
> > > +
> > > +  port: true
> >
> > This goes before reset-gpios
>
> Ack
>
> > > +  reg:
> > > +    maxItems: 1
> > > +    description: DSI virtual channel
> > > +
> > > +  vdd-supply: true
> > > +  vddio-supply: true
> > > +  vdd1v2-supply: true
> > > +  avdd-supply: true
> > > +
> > > +  reset-gpios: true
> > > +
> >
> > Drop blank line here (it is port+reset-gpios+rotation in three lines).
>
> Ack
>
> >
> > > +  rotation: true
> > > +
> >
> > Best regards,
> > Krzysztof
> >
Aaron

[0] https://www.scribd.com/document/910879274/CH13726A-SPEC-V0-0

[PATCH v2 2/2] drm/panel: Add panel driver for ChipWealth CH13726A based panels

[Aaron Kling via B4 Relay]

From: Teguh Sobirin <teguh@sobir.in>

This is used by the AYN Thor for the bottom panel.

Signed-off-by: Teguh Sobirin <teguh@sobir.in>
Co-developed-by: Aaron Kling <webgeek1234@gmail.com>
Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig                     |  11 +
 drivers/gpu/drm/panel/Makefile                    |   1 +
 drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c | 339 ++++++++++++++++++++++
 3 files changed, 351 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index a99f2e2a49fe66a09c6f2d503f570b05a5e228b1..e953b61a819082866b93d0a453ee750a76d70c18 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -105,6 +105,17 @@ config DRM_PANEL_BOE_TV101WUM_LL2
 	  Say Y here if you want to support for BOE TV101WUM-LL2
 	  WUXGA PANEL DSI Video Mode panel
 
+config DRM_PANEL_CHIPWEALTH_CH13726A
+	tristate "CHIPWEALTH CH13726A-based DSI panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_DISPLAY_DP_HELPER
+	select DRM_DISPLAY_HELPER
+	help
+	  Say Y here if you want to enable support for ChipWealth
+	  CH13726A-based display panels.
+
 config DRM_PANEL_EBBG_FT8719
 	tristate "EBBG FT8719 panel driver"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 3336a2c0cd86419b6a22f74dcde6df966a311da9..85da2eb5a5c664d4302837f52e7e10ec11da8966 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_DRM_PANEL_BOE_TD4320) += panel-boe-td4320.o
 obj-$(CONFIG_DRM_PANEL_BOE_TH101MB31UIG002_28A) += panel-boe-th101mb31ig002-28a.o
 obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_LL2) += panel-boe-tv101wum-ll2.o
 obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_NL6) += panel-boe-tv101wum-nl6.o
+obj-$(CONFIG_DRM_PANEL_CHIPWEALTH_CH13726A) += panel-chipwealth-ch13726a.o
 obj-$(CONFIG_DRM_PANEL_DSI_CM) += panel-dsi-cm.o
 obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
 obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
diff --git a/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c b/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c
new file mode 100644
index 0000000000000000000000000000000000000000..48a5e20e07c48748e073f8bb9147036c18c51caa
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c
@@ -0,0 +1,339 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ChipWealth CH13726A MIPI-DSI panel driver
+ * Copyright (c) 2024, Teguh Sobirin <teguh@sobir.in>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct ch13726a_panel {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data supplies[4];
+	struct gpio_desc *reset_gpio;
+	struct ch13726a_desc *desc;
+	enum drm_panel_orientation orientation;
+	bool prepared;
+};
+
+struct ch13726a_desc {
+	unsigned int width_mm;
+	unsigned int height_mm;
+	unsigned int bpc;
+
+	const struct drm_display_mode *modes;
+	unsigned int num_modes;
+};
+
+static inline struct ch13726a_panel *to_ch13726a_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct ch13726a_panel, panel);
+}
+
+static void ch13726a_reset(struct ch13726a_panel *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+}
+
+static int ch13726a_on(struct ch13726a_panel *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x50);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x00);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static int ch13726a_disable(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	ctx->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static int ch13726a_prepare(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	ch13726a_reset(ctx);
+
+	ret = ch13726a_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+		return ret;
+	}
+
+	msleep(28);
+
+	ctx->prepared = true;
+
+	return 0;
+}
+
+static int ch13726a_unprepare(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
+
+	if (!ctx->prepared)
+		return 0;
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+	ctx->prepared = false;
+	return 0;
+}
+
+static const struct drm_display_mode thor_bottom_modes[] = {
+	{
+		/* 120Hz */
+		.clock = (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 120 / 1000,
+		.hdisplay = 1080,
+		.hsync_start = 1080 + 28,
+		.hsync_end = 1080 + 28 + 4,
+		.htotal = 1080 + 28 + 4 + 36,
+		.vdisplay = 1240,
+		.vsync_start = 1240 + 16,
+		.vsync_end = 1240 + 16 + 4,
+		.vtotal = 1240 + 16 + 4 + 8,
+	},
+	{
+		/* 60Hz */
+		.clock = (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 60 / 1000,
+		.hdisplay = 1080,
+		.hsync_start = 1080 + 28,
+		.hsync_end = 1080 + 28 + 4,
+		.htotal = 1080 + 28 + 4 + 36,
+		.vdisplay = 1240,
+		.vsync_start = 1240 + 16,
+		.vsync_end = 1240 + 16 + 4,
+		.vtotal = 1240 + 16 + 4 + 8,
+	}
+};
+
+static struct ch13726a_desc thor_bottom_desc = {
+	.modes = thor_bottom_modes,
+	.num_modes = ARRAY_SIZE(thor_bottom_modes),
+	.width_mm = 65,
+	.height_mm = 75,
+	.bpc = 8,
+};
+
+static int ch13726a_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
+
+	for (uint8_t i = 0; i < ctx->desc->num_modes; i++) {
+		const struct drm_display_mode *m = &ctx->desc->modes[i];
+		struct drm_display_mode *mode;
+
+		mode = drm_mode_duplicate(connector->dev, m);
+		if (!mode) {
+			dev_err(&ctx->dsi->dev, "failed to add mode %ux%u@%u\n",
+				m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
+			return -ENOMEM;
+		}
+
+		mode->type = DRM_MODE_TYPE_DRIVER;
+		if (i == 0)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_set_name(mode);
+		drm_mode_probed_add(connector, mode);
+	}
+
+	connector->display_info.width_mm = ctx->desc->width_mm;
+	connector->display_info.height_mm = ctx->desc->height_mm;
+	connector->display_info.bpc = ctx->desc->bpc;
+
+	return ctx->desc->num_modes;
+}
+
+static enum drm_panel_orientation ch13726a_get_orientation(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
+
+	return ctx->orientation;
+}
+
+static const struct drm_panel_funcs ch13726a_panel_funcs = {
+	.prepare = ch13726a_prepare,
+	.unprepare = ch13726a_unprepare,
+	.disable = ch13726a_disable,
+	.get_modes = ch13726a_get_modes,
+	.get_orientation = ch13726a_get_orientation,
+};
+
+static int ch13726a_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static const struct backlight_ops ch13726a_bl_ops = {
+	.update_status = ch13726a_bl_update_status,
+};
+
+static struct backlight_device *
+ch13726a_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 255,
+		.max_brightness = 255,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &ch13726a_bl_ops, &props);
+}
+
+static int ch13726a_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct ch13726a_panel *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->desc = (struct ch13726a_desc *)of_device_get_match_data(dev);
+	if (!ctx->desc)
+		return -ENODEV;
+
+	ctx->supplies[0].supply = "vdd1v2";
+	ctx->supplies[1].supply = "vddio";
+	ctx->supplies[2].supply = "vdd";
+	ctx->supplies[3].supply = "avdd";
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
+	if (ret < 0) {
+		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
+		return ret;
+	}
+
+	ctx->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+	drm_panel_init(&ctx->panel, dev, &ch13726a_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = true;
+
+	ctx->panel.backlight = ch13726a_create_backlight(dsi);
+	if (IS_ERR(ctx->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+				     "Failed to create backlight\n");
+
+	drm_panel_add(&ctx->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+		drm_panel_remove(&ctx->panel);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void ch13726a_remove(struct mipi_dsi_device *dsi)
+{
+	struct ch13726a_panel *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id ch13726a_of_match[] = {
+	{ .compatible = "ayntec,thor-panel-bottom", .data = &thor_bottom_desc },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ch13726a_of_match);
+
+static struct mipi_dsi_driver ch13726a_driver = {
+	.probe = ch13726a_probe,
+	.remove = ch13726a_remove,
+	.driver = {
+		.name = "panel-ch13726a-amoled",
+		.of_match_table = ch13726a_of_match,
+	},
+};
+module_mipi_dsi_driver(ch13726a_driver);
+
+MODULE_DESCRIPTION("DRM driver for CH13726A DSI panels");
+MODULE_LICENSE("GPL");

-- 
2.53.0