[PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Marek Vasut]

Move the Waveshare panels description into separate document, so they
can be properly described with compatible = "waveshare,...", "panel-dpi"
and attached to "waveshare,dsi2dpi" bridge.

While these panels are described as DPI panels, they are generally part
of a larger unit in non-removable metal casing, so the actual internal
configuration is not known. It is likely that internally, those panels
are LVDS panels, connected to ICN6211 DSI-to-DPI bridge and then another
unknown DPI-to-LVDS bridge.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
---
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Jessica Zhang <jesszhan0024@gmail.com>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
---
 .../bindings/display/panel/panel-simple.yaml  |  4 ---
 .../bindings/display/panel/waveshare,dpi.yaml | 32 +++++++++++++++++++
 2 files changed, 32 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
index e4a5b30ccfc93..62bfc3f4fee14 100644
--- a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
+++ b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
@@ -335,10 +335,6 @@ properties:
       - vivax,tpc9150-panel
         # VXT 800x480 color TFT LCD panel
       - vxt,vl050-8048nt-c01
-        # Waveshare 13.3" FHD (1920x1080) LCD panel
-      - waveshare,13.3inch-panel
-        # Waveshare 7.0" WSVGA (1024x600) LCD panel
-      - waveshare,7.0inch-c-panel
         # Winstar Display Corporation 3.5" QVGA (320x240) TFT LCD panel
       - winstar,wf35ltiacd
         # Yes Optoelectronics YTC700TLAG-05-201C 7" TFT LCD panel
diff --git a/Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml b/Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml
new file mode 100644
index 0000000000000..40a6a8e98cc33
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/waveshare,dpi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Waveshare Touch Display
+
+maintainers:
+  - Marek Vasut <marek.vasut+renesas@mailbox.org>
+
+allOf:
+  - $ref: panel-dpi.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - waveshare,13.3inch-panel
+          - waveshare,7.0inch-c-panel
+      - {} # panel-dpi, but not listed here to avoid false select
+
+  height-mm: true
+  label: true
+  panel-timing: true
+  port: true
+  power-supply: true
+  width-mm: true
+
+additionalProperties: false
+
+...
-- 
2.51.0

[PATCH 2/2] arm64: dts: renesas: sparrow-hawk: Add overlay for WaveShare Display 13.3"

[Marek Vasut]

Add a DT overlay to bind the WaveShare 13.3inch 1920x1080 DSI Capacitive
Touch Display on the Retronix R-Car V4H Sparrow Hawk board.

Current device link is at https://www.waveshare.com/13.3inch-dsi-lcd.htm

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
---
DEPENDS:
- https://lore.kernel.org/linux-input/20260112234534.225954-1-marek.vasut+renesas@mailbox.org/
- https://lore.kernel.org/linux-devicetree/20260112234834.226128-1-marek.vasut+renesas@mailbox.org/
---
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Jessica Zhang <jesszhan0024@gmail.com>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
---
 arch/arm64/boot/dts/renesas/Makefile          |   3 +
 ...r8a779g3-sparrow-hawk-ws-display-13in.dtso | 108 ++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-ws-display-13in.dtso

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index 1fab1b50f20e6..8a2d1baa69c77 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -120,6 +120,9 @@ dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-5in.dtb
 dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-7in.dtbo
 r8a779g3-sparrow-hawk-rpi-display-2-7in-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-rpi-display-2-7in.dtbo
 dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-rpi-display-2-7in.dtb
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-ws-display-13in.dtbo
+r8a779g3-sparrow-hawk-ws-display-13in-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-ws-display-13in.dtbo
+dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-ws-display-13in.dtb
 
 dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-white-hawk-single.dtb
 r8a779g3-white-hawk-single-ard-audio-da7212-dtbs := r8a779g3-white-hawk-single.dtb white-hawk-ard-audio-da7212.dtbo
diff --git a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-ws-display-13in.dtso b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-ws-display-13in.dtso
new file mode 100644
index 0000000000000..e520fa264d790
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-ws-display-13in.dtso
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Overlay for the Waveshare 13.3 MIPI DSI panel connected
+ * to J4:DSI on R-Car V4H ES3.0 Sparrow Hawk board
+ *
+ * Copyright (C) 2025-2026 Marek Vasut <marek.vasut+renesas@mailbox.org>
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&{/} {
+	panel {
+		compatible = "waveshare,13.3inch-panel", "panel-dpi";
+		width-mm = <293>;
+		height-mm = <163>;
+		power-supply = <&reg_5p0v>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&bridge_out>;
+			};
+		};
+
+		panel-timing {
+			clock-frequency = <148500000>;
+			hactive = <1920>;
+			vactive = <1080>;
+			hfront-porch = <88>;
+			hback-porch = <148>;
+			hsync-len = <44>;
+			vback-porch = <4>;
+			vfront-porch = <36>;
+			vsync-len = <5>;
+			hsync-active = <1>;
+			vsync-active = <1>;
+			de-active = <0>;
+			pixelclk-active = <0>;
+		};
+	};
+
+	reg_5p0v: regulator-5p0v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-5.0V";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+};
+
+&i2c0_mux3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	touchscreen@41 {
+		compatible = "ilitek,ili251x";
+		reg = <0x41>;
+	};
+
+	bridge@45 {
+		compatible = "waveshare,dsi2dpi";
+		reg = <0x45>;
+		power-supply = <&reg_5p0v>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				bridge_in: endpoint {
+					data-lanes = <1 2 3 4>;
+					remote-endpoint = <&dsi0_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				bridge_out: endpoint {
+					remote-endpoint = <&panel_in>;
+				};
+			};
+		};
+	};
+};
+
+&dsi0 {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@1 {
+			reg = <1>;
+
+			dsi0_out: endpoint {
+				remote-endpoint = <&bridge_in>;
+				data-lanes = <1 2 3 4>;
+			};
+		};
+	};
+};
-- 
2.51.0

Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Geert Uytterhoeven]

Hi Marek,

On Tue, 13 Jan 2026 at 01:07, Marek Vasut
<marek.vasut+renesas@mailbox.org> wrote:
> Move the Waveshare panels description into separate document, so they
> can be properly described with compatible = "waveshare,...", "panel-dpi"
> and attached to "waveshare,dsi2dpi" bridge.
>
> While these panels are described as DPI panels, they are generally part
> of a larger unit in non-removable metal casing, so the actual internal
> configuration is not known. It is likely that internally, those panels
> are LVDS panels, connected to ICN6211 DSI-to-DPI bridge and then another
> unknown DPI-to-LVDS bridge.
>
> Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml
> @@ -0,0 +1,32 @@
> +# SPDX-License-Identifier: GPL-2.0

scripts/checkpatch.pl:

    WARNING: DT binding documents should be licensed (GPL-2.0-only OR
BSD-2-Clause)
    #68: FILE: Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml:1:

which matches what panel-simple.yaml uses.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Marek Vasut]

On 1/13/26 10:13 AM, Geert Uytterhoeven wrote:

Hello Geert,

>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml
>> @@ -0,0 +1,32 @@
>> +# SPDX-License-Identifier: GPL-2.0
> 
> scripts/checkpatch.pl:
> 
>      WARNING: DT binding documents should be licensed (GPL-2.0-only OR
> BSD-2-Clause)
>      #68: FILE: Documentation/devicetree/bindings/display/panel/waveshare,dpi.yaml:1:
Sigh, fixed in V2, thanks .

I'll send V2 in a few days to get some feedback on 2/2 first.

Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Rob Herring]

On Tue, Jan 13, 2026 at 01:05:30AM +0100, Marek Vasut wrote:
> Move the Waveshare panels description into separate document, so they
> can be properly described with compatible = "waveshare,...", "panel-dpi"
> and attached to "waveshare,dsi2dpi" bridge.

But why do we need "panel-dpi"? Adding that requires changing a DT. 
Can't you make the kernel handle these compatible strings as a 
"panel-dpi" without the compatible?

Rob

Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Marek Vasut]

On 1/15/26 6:40 PM, Rob Herring wrote:
> On Tue, Jan 13, 2026 at 01:05:30AM +0100, Marek Vasut wrote:
>> Move the Waveshare panels description into separate document, so they
>> can be properly described with compatible = "waveshare,...", "panel-dpi"
>> and attached to "waveshare,dsi2dpi" bridge.
> 
> But why do we need "panel-dpi"? Adding that requires changing a DT.
> Can't you make the kernel handle these compatible strings as a
> "panel-dpi" without the compatible?
I can, but wouldn't we then miss the more specific compatible strings in 
the DT ?

compatible = "waveshare,13.3inch-panel", "panel-dpi";
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
              this ... would be removed. Do we want that ?

The other option would be to add the timings into panel-simple driver, 
then we wouldn't have to change the bindings at all. Maybe that would be 
preferable ?

Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Rob Herring]

On Thu, Jan 15, 2026 at 1:20 PM Marek Vasut <marek.vasut@mailbox.org> wrote:
>
> On 1/15/26 6:40 PM, Rob Herring wrote:
> > On Tue, Jan 13, 2026 at 01:05:30AM +0100, Marek Vasut wrote:
> >> Move the Waveshare panels description into separate document, so they
> >> can be properly described with compatible = "waveshare,...", "panel-dpi"
> >> and attached to "waveshare,dsi2dpi" bridge.
> >
> > But why do we need "panel-dpi"? Adding that requires changing a DT.
> > Can't you make the kernel handle these compatible strings as a
> > "panel-dpi" without the compatible?
> I can, but wouldn't we then miss the more specific compatible strings in
> the DT ?
>
> compatible = "waveshare,13.3inch-panel", "panel-dpi";
>               ^^^^^^^^^^^^^^^^^^^^^^^^^^
>               this ... would be removed. Do we want that ?

No, drop "panel-dpi". Or really, don't add it.

>
> The other option would be to add the timings into panel-simple driver,
> then we wouldn't have to change the bindings at all. Maybe that would be
> preferable ?

Why can't the "panel-dpi" driver match to"waveshare,13.3inch-panel"?

Rob

Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

[Marek Vasut]

On 1/16/26 4:26 AM, Rob Herring wrote:
> On Thu, Jan 15, 2026 at 1:20 PM Marek Vasut <marek.vasut@mailbox.org> wrote:
>>
>> On 1/15/26 6:40 PM, Rob Herring wrote:
>>> On Tue, Jan 13, 2026 at 01:05:30AM +0100, Marek Vasut wrote:
>>>> Move the Waveshare panels description into separate document, so they
>>>> can be properly described with compatible = "waveshare,...", "panel-dpi"
>>>> and attached to "waveshare,dsi2dpi" bridge.
>>>
>>> But why do we need "panel-dpi"? Adding that requires changing a DT.
>>> Can't you make the kernel handle these compatible strings as a
>>> "panel-dpi" without the compatible?
>> I can, but wouldn't we then miss the more specific compatible strings in
>> the DT ?
>>
>> compatible = "waveshare,13.3inch-panel", "panel-dpi";
>>                ^^^^^^^^^^^^^^^^^^^^^^^^^^
>>                this ... would be removed. Do we want that ?
> 
> No, drop "panel-dpi". Or really, don't add it.
> 
>>
>> The other option would be to add the timings into panel-simple driver,
>> then we wouldn't have to change the bindings at all. Maybe that would be
>> preferable ?
> 
> Why can't the "panel-dpi" driver match to"waveshare,13.3inch-panel"?
It could, but then, if I am already patching that panel-simple driver, I 
can also simply include the timings in it, just like many other panels do.