[PATCH] arm64: dts: renesas: Add pixpaper display overlay for RZ/V2H Kakip board

[PATCH] arm64: dts: renesas: Add pixpaper display overlay for RZ/V2H Kakip board

[Wig Cheng]

Add device tree overlay to support the MayQueen PixPaper e-paper display
on the Renesas RZ/V2H EVK (KAKIP board). The display is connected via
SPI0 interface and uses GPIO pins for reset, busy, and DC control.

The overlay configures:
    - RSPI0 pinmux for SPI communication (MOSI, MISO, CLK, CE0)
    - PixPaper display device with proper GPIO assignments
    - SPI frequency set to 1MHz for stable operation

This enables support for the Open-EP Community pixpaper-213-c module on
the RZ/V2H platform.

Signed-off-by: Wig Cheng <onlywig@gmail.com>
---
 arch/arm64/boot/dts/renesas/Makefile          |  3 ++
 .../renesas/r9a09g057h48-kakip-pixpaper.dtso  | 40 +++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index 1fab1b50f20e..d4dfb7fd973b 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -202,6 +202,9 @@ dtb-$(CONFIG_ARCH_R9A09G057) += rzv2-evk-cn15-sd.dtbo
 r9a09g057h44-rzv2h-evk-cn15-sd-dtbs := r9a09g057h44-rzv2h-evk.dtb rzv2-evk-cn15-sd.dtbo
 dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h44-rzv2h-evk-cn15-sd.dtb
 dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip.dtb
+dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip-pixpaper.dtbo
+r9a09g057h48-kakip-pixpaper-dtbs := r9a09g057h48-kakip.dtb r9a09g057h48-kakip-pixpaper.dtbo
+dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip-pixpaper.dtb
 
 dtb-$(CONFIG_ARCH_R9A09G077) += r9a09g077m44-rzt2h-evk.dtb
 
diff --git a/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
new file mode 100644
index 000000000000..e36cfc9227f4
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Overlay for Mayqueen (Open-EP Community) pixpaper display
+ * support on Renesas RZ/V2H platform (KAKIP board).
+ *
+ * Copyright (C) 2026 Wig Cheng <onlywig@gmail.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/pinctrl/renesas,r9a09g057-pinctrl.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+&pinctrl {
+	rspi0_pins: rspi0 {
+		pinmux = <RZV2H_PORT_PINMUX(9, 0, 1)>, /* SPI0 MOSI */
+			 <RZV2H_PORT_PINMUX(9, 1, 1)>, /* SPI0 MISO */
+			 <RZV2H_PORT_PINMUX(9, 2, 1)>, /* SPI0 CLK */
+			 <RZV2H_PORT_PINMUX(9, 3, 1)>; /* SPI0 CE0 */
+	};
+};
+
+&rspi0 {
+	pinctrl-0 = <&rspi0_pins>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	display0: display@0 {
+		compatible = "mayqueen,pixpaper";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		reset-gpios = <&pinctrl RZV2H_GPIO(A, 7) GPIO_ACTIVE_HIGH>;
+		busy-gpios = <&pinctrl RZV2H_GPIO(B, 3) GPIO_ACTIVE_HIGH>;
+		dc-gpios = <&pinctrl RZV2H_GPIO(7, 4) GPIO_ACTIVE_HIGH>;
+	};
+};
-- 
2.43.0

Re: [PATCH] arm64: dts: renesas: Add pixpaper display overlay for RZ/V2H Kakip board

[Wig Cheng]

Wig Cheng <onlywig@gmail.com> 於 2026年1月25日週日 上午12:36寫道：
>
> Add device tree overlay to support the MayQueen PixPaper e-paper display
> on the Renesas RZ/V2H EVK (KAKIP board). The display is connected via
> SPI0 interface and uses GPIO pins for reset, busy, and DC control.
>
> The overlay configures:
>     - RSPI0 pinmux for SPI communication (MOSI, MISO, CLK, CE0)
>     - PixPaper display device with proper GPIO assignments
>     - SPI frequency set to 1MHz for stable operation
>
> This enables support for the Open-EP Community pixpaper-213-c module on
> the RZ/V2H platform.
>
> Signed-off-by: Wig Cheng <onlywig@gmail.com>
> ---
>  arch/arm64/boot/dts/renesas/Makefile          |  3 ++
>  .../renesas/r9a09g057h48-kakip-pixpaper.dtso  | 40 +++++++++++++++++++
>  2 files changed, 43 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
>
> diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
> index 1fab1b50f20e..d4dfb7fd973b 100644
> --- a/arch/arm64/boot/dts/renesas/Makefile
> +++ b/arch/arm64/boot/dts/renesas/Makefile
> @@ -202,6 +202,9 @@ dtb-$(CONFIG_ARCH_R9A09G057) += rzv2-evk-cn15-sd.dtbo
>  r9a09g057h44-rzv2h-evk-cn15-sd-dtbs := r9a09g057h44-rzv2h-evk.dtb rzv2-evk-cn15-sd.dtbo
>  dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h44-rzv2h-evk-cn15-sd.dtb
>  dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip.dtb
> +dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip-pixpaper.dtbo
> +r9a09g057h48-kakip-pixpaper-dtbs := r9a09g057h48-kakip.dtb r9a09g057h48-kakip-pixpaper.dtbo
> +dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip-pixpaper.dtb
>
>  dtb-$(CONFIG_ARCH_R9A09G077) += r9a09g077m44-rzt2h-evk.dtb
>
> diff --git a/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
> new file mode 100644
> index 000000000000..e36cfc9227f4
> --- /dev/null
> +++ b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
> @@ -0,0 +1,40 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree Overlay for Mayqueen (Open-EP Community) pixpaper display
> + * support on Renesas RZ/V2H platform (KAKIP board).
> + *
> + * Copyright (C) 2026 Wig Cheng <onlywig@gmail.com>
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/pinctrl/renesas,r9a09g057-pinctrl.h>
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +
> +&pinctrl {
> +       rspi0_pins: rspi0 {
> +               pinmux = <RZV2H_PORT_PINMUX(9, 0, 1)>, /* SPI0 MOSI */
> +                        <RZV2H_PORT_PINMUX(9, 1, 1)>, /* SPI0 MISO */
> +                        <RZV2H_PORT_PINMUX(9, 2, 1)>, /* SPI0 CLK */
> +                        <RZV2H_PORT_PINMUX(9, 3, 1)>; /* SPI0 CE0 */
> +       };
> +};
> +
> +&rspi0 {
> +       pinctrl-0 = <&rspi0_pins>;
> +       pinctrl-names = "default";
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +       status = "okay";
> +
> +       display0: display@0 {
> +               compatible = "mayqueen,pixpaper";
> +               reg = <0>;
> +               spi-max-frequency = <1000000>;
> +               reset-gpios = <&pinctrl RZV2H_GPIO(A, 7) GPIO_ACTIVE_HIGH>;
> +               busy-gpios = <&pinctrl RZV2H_GPIO(B, 3) GPIO_ACTIVE_HIGH>;
> +               dc-gpios = <&pinctrl RZV2H_GPIO(7, 4) GPIO_ACTIVE_HIGH>;
> +       };
> +};
> --
> 2.43.0
>

Hi reviewers,
I submitted this patch on January 25th adding device tree overlay
support for the MayQueen PixPaper e-paper display on the Renesas
RZ/V2H EVK (KAKIP board).

I haven't received any feedback yet and wanted to kindly check if
there are any concerns or suggestions for improvement. I'm happy to
address any issues and submit a v2 if needed.
The patch is available at:
https://lore.kernel.org/linux-renesas-soc/20260124163611.3279104-1-onlywig@gmail.com

Thank you for your time and consideration.

Regards,
Wig

Re: [PATCH] arm64: dts: renesas: Add pixpaper display overlay for RZ/V2H Kakip board

[Wig Cheng]

> >
> > Add device tree overlay to support the MayQueen PixPaper e-paper display
> > on the Renesas RZ/V2H EVK (KAKIP board). The display is connected via
> > SPI0 interface and uses GPIO pins for reset, busy, and DC control.
> >

Hi Geert, Magnus,

Gentle ping on this patch. Note that the pixpaper driver and
dt-bindings "mayqueen,pixpaper" were merged into drm-misc-next for
v6.18 in September 2025, so the prerequisite is now in mainline.
Happy to make any changes if needed.

Thanks,

Wig

Re: [PATCH] arm64: dts: renesas: Add pixpaper display overlay for RZ/V2H Kakip board

[Geert Uytterhoeven]

Hi Wig,

On Sat, 24 Jan 2026 at 17:36, Wig Cheng <onlywig@gmail.com> wrote:
> Add device tree overlay to support the MayQueen PixPaper e-paper display
> on the Renesas RZ/V2H EVK (KAKIP board). The display is connected via
> SPI0 interface and uses GPIO pins for reset, busy, and DC control.
>
> The overlay configures:
>     - RSPI0 pinmux for SPI communication (MOSI, MISO, CLK, CE0)
>     - PixPaper display device with proper GPIO assignments
>     - SPI frequency set to 1MHz for stable operation
>
> This enables support for the Open-EP Community pixpaper-213-c module on
> the RZ/V2H platform.
>
> Signed-off-by: Wig Cheng <onlywig@gmail.com>

Thanks for your patch!

> --- /dev/null
> +++ b/arch/arm64/boot/dts/renesas/r9a09g057h48-kakip-pixpaper.dtso
> @@ -0,0 +1,40 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree Overlay for Mayqueen (Open-EP Community) pixpaper display
> + * support on Renesas RZ/V2H platform (KAKIP board).
> + *
> + * Copyright (C) 2026 Wig Cheng <onlywig@gmail.com>
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/pinctrl/renesas,r9a09g057-pinctrl.h>
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/interrupt-controller/irq.h>

This include is not needed, so I will drop it while applying.

> +
> +&pinctrl {
> +       rspi0_pins: rspi0 {
> +               pinmux = <RZV2H_PORT_PINMUX(9, 0, 1)>, /* SPI0 MOSI */
> +                        <RZV2H_PORT_PINMUX(9, 1, 1)>, /* SPI0 MISO */
> +                        <RZV2H_PORT_PINMUX(9, 2, 1)>, /* SPI0 CLK */
> +                        <RZV2H_PORT_PINMUX(9, 3, 1)>; /* SPI0 CE0 */
> +       };
> +};
> +
> +&rspi0 {
> +       pinctrl-0 = <&rspi0_pins>;
> +       pinctrl-names = "default";
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +       status = "okay";
> +
> +       display0: display@0 {

The label is not needed, so I will drop it while applying.

> +               compatible = "mayqueen,pixpaper";
> +               reg = <0>;
> +               spi-max-frequency = <1000000>;
> +               reset-gpios = <&pinctrl RZV2H_GPIO(A, 7) GPIO_ACTIVE_HIGH>;
> +               busy-gpios = <&pinctrl RZV2H_GPIO(B, 3) GPIO_ACTIVE_HIGH>;
> +               dc-gpios = <&pinctrl RZV2H_GPIO(7, 4) GPIO_ACTIVE_HIGH>;
> +       };
> +};

The rest LGTM, so
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-devel for v7.1 with the above fixed.
No need to resend.

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