linux-kernel - Re: [PATCH] arm64: dts: freescale: add pixpaper display overlay for i.MX93 FRDM

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Message-ID: <aXj/Qs4smDjoURoZ@lizhi-Precision-Tower-5810>
Date: Tue, 27 Jan 2026 13:09:06 -0500
From: Frank Li <Frank.li@....com>
To: Wig Cheng <onlywig@...il.com>
Cc: Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, zaq14760@...il.com,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: freescale: add pixpaper display overlay for
 i.MX93 FRDM

On Tue, Jan 27, 2026 at 10:57:40AM +0800, Wig Cheng wrote:
> Add device tree overlay to support the MayQueen PixPaper e-paper display
> on the NXP i.MX93 FRDM board. The display is connected via LPSPI3
> interface and uses GPIO pins for reset, busy and DC control.
>
> The overlay configures:
>     - LPSPI3 pinmux for SPI communication (MOSI, MISO, CLK, CE0)
>     - PixPaper display device with proper GPIO assignments
>     - SPI frequency set to 5MHz for stable operation
>
> This enables support for the Open-EP Community pixpaper-213-c module on
> the NXP i.MX93 platform.

Enable Open-EP Community pixpaper-213-c support on NXP i.MX93.

>
> Signed-off-by: Wig Cheng <onlywig@...il.com>
> ---
>  arch/arm64/boot/dts/freescale/Makefile        |  3 ++
>  .../freescale/imx93-11x11-frdm-pixpaper.dtso  | 51 +++++++++++++++++++
>  2 files changed, 54 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx93-11x11-frdm-pixpaper.dtso
>
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index ce8f937c2315..fedd3552b577 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -403,6 +403,9 @@ dtb-$(CONFIG_ARCH_MXC) += imx93-kontron-bl-osm-s.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin.dtb
>
> +imx93-11x11-frdm-pixpaper-dtbs += imx93-11x11-frdm.dtb imx93-11x11-frdm-pixpaper.dtbo
> +dtb-$(CONFIG_ARCH_MXC) += imx93-11x11-frdm-pixpaper.dtb
> +

imx93-11x11-frdm-pixpaper.dtb, Keep alphabet order.

>  imx93-phyboard-nash-jtag-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-jtag.dtbo
>  imx93-phyboard-nash-peb-wlbt-07-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-peb-wlbt-07.dtbo
>  imx93-phyboard-nash-pwm-fan-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-pwm-fan.dtbo
> diff --git a/arch/arm64/boot/dts/freescale/imx93-11x11-frdm-pixpaper.dtso b/arch/arm64/boot/dts/freescale/imx93-11x11-frdm-pixpaper.dtso
> new file mode 100644
> index 000000000000..38e0c5dd82f9
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx93-11x11-frdm-pixpaper.dtso
> @@ -0,0 +1,51 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree Overlay for Mayqueen (Open-EP Community) pixpaper display
> + * support on NXP FRDM i.MX 93 Development Board
> + *
> + * Copyright (C) 2026 Wig Cheng <onlywig@...il.com>
> + */
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include "imx93-pinfunc.h"
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&iomuxc {
> +	pinctrl_lpspi3: lpspi3grp {
> +		fsl,pins = <
> +			MX93_PAD_GPIO_IO08__GPIO2_IO08		0x3fe /* SPI3 CE0 */
> +			MX93_PAD_GPIO_IO09__LPSPI3_SIN		0x3fe /* SPI3 MISO */
> +			MX93_PAD_GPIO_IO10__LPSPI3_SOUT		0x3fe /* SPI3 MOSI */
> +			MX93_PAD_GPIO_IO11__LPSPI3_SCK		0x3fe /* SPI3 CLK*/
> +		>;
> +	};
> +
> +	pinctrl_epd_ctrl: epdctrlgrp {

keep alphabet according to node name.

> +		fsl,pins = <
> +			MX93_PAD_GPIO_IO05__GPIO2_IO05		0x31e /* DC pin */
> +			MX93_PAD_GPIO_IO06__GPIO2_IO06		0x31e /* RESET pin */
> +			MX93_PAD_GPIO_IO26__GPIO2_IO26		0x31e /* BUSY pin */
> +		>;
> +	};
> +};
> +
> +&lpspi3 {
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	fsl,spi-num-chipselects = <1>;

vendor property should be last one just before status.

You can use https://github.com/lznuaa/dt-format to format your dts.


Frank Li
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_lpspi3>, <&pinctrl_epd_ctrl>;
> +	cs-gpios = <&gpio2 8 GPIO_ACTIVE_LOW>;
> +	status = "okay";
> +
> +	display@0 {
> +		compatible = "mayqueen,pixpaper";
> +		reg = <0>;
> +		spi-max-frequency = <5000000>;
> +		reset-gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
> +		dc-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;
> +		busy-gpios = <&gpio2 26 GPIO_ACTIVE_HIGH>;
> +	};
> +};
> --
> 2.43.0
>