[Linux-stm32] [PATCH v3 13/14] arm64: dts: st: support Engicam MicroGEA-STM32MP257-RMM board

Amelie Delaunay amelie.delaunay at foss.st.com
Fri Jun 5 00:55:29 PDT 2026 

Hi Dario,

On 6/5/26 08:27, Dario Binacchi wrote:
> Support for Engicam MicroGEA-STM32MP257-RMM board with:
> 
>   - 8 GB eMMC Flash
>   - 2 GB LPDDR4 DRAM
>   - CAN
>   - LEDs
>   - LCD panel with touchscreen
>   - Micro SD card connector
>   - Audio codec
>   - Buzzer
> 
> Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> 
> ---
> 
> (no changes since v2)
> 
> Changes in v2:
> - Drop the clocks property from the sai1 node in stm32mp257-engicam-microgea-rmm.dts
>    to avoid overriding the peripheral bus clock reference defined in the base
>    SoC device tree. Suggested by Sashiko.
> - Reference the existing labeled nodes directly at the root level using
>    &sai1a and &sai1b in stm32mp257-engicam-microgea-rmm.dts instead of
>    redefining the entire node structure and redeclaring the labels. Suggested by Sashiko.
> - Drop the #clock-cells property from sai1a and remove the reference to sai1a from
>    the clocks array in sai1b, relying strictly on the st,sync property to handle
>    internal synchronization.
> 
>   arch/arm64/boot/dts/st/Makefile               |   1 +
>   .../st/stm32mp257-engicam-microgea-rmm.dts    | 319 ++++++++++++++++++
>   2 files changed, 320 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/st/stm32mp257-engicam-microgea-rmm.dts
> 
> diff --git a/arch/arm64/boot/dts/st/Makefile b/arch/arm64/boot/dts/st/Makefile
> index 63908113ae36..386eca593c54 100644
> --- a/arch/arm64/boot/dts/st/Makefile
> +++ b/arch/arm64/boot/dts/st/Makefile
> @@ -2,5 +2,6 @@
>   dtb-$(CONFIG_ARCH_STM32) += \
>   	stm32mp215f-dk.dtb \
>   	stm32mp235f-dk.dtb \
> +	stm32mp257-engicam-microgea-rmm.dtb \
>   	stm32mp257f-dk.dtb \
>   	stm32mp257f-ev1.dtb
> diff --git a/arch/arm64/boot/dts/st/stm32mp257-engicam-microgea-rmm.dts b/arch/arm64/boot/dts/st/stm32mp257-engicam-microgea-rmm.dts
> new file mode 100644
> index 000000000000..0212c03aae1a
> --- /dev/null
> +++ b/arch/arm64/boot/dts/st/stm32mp257-engicam-microgea-rmm.dts
> @@ -0,0 +1,319 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2026 Amarula Solutions, Dario Binacchi <dario.binacchi at amarulasolutions.com>
> + * Copyright (C) 2026 Engicam srl
> + */
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
> +#include <dt-bindings/leds/common.h>
> +
> +#include "stm32mp257-engicam-microgea.dtsi"
> +
> +/ {
> +	model = "Engicam MicroGEA STM32MP257D RMM Board";

If the SoC is an STM32MP257D, as mentionned in the board model, 
stm32mp25xf.dtsi should not be included in 
stm32mp257-engicam-microgea.dtsi (in PATCH 12).
Unless the SoM can be fitted with any STM32MP257, in which case, when 
stm32mp25xf.dtsi is populated, you will need to add /delete-node/ 
statements on the board side, to remove the HW crypto support.

Regards,
Amelie

> +	compatible = "engicam,microgea-stm32mp257-rmm",
> +		     "engicam,microgea-stm32mp257", "st,stm32mp257";
> +
> +	aliases {
> +		mmc0 = &sdmmc1;
> +		mmc1 = &sdmmc2;
> +		serial0 = &usart2;
> +		serial1 = &usart1;
> +	};
> +
> +	backlight: backlight {
> +		compatible = "pwm-backlight";
> +		brightness-levels = <0 100>;
> +		num-interpolated-steps = <100>;
> +		default-brightness-level = <85>;
> +		pwms = <&pwm2 0 100000 0>;
> +	};
> +
> +	buzzer {
> +		compatible = "pwm-beeper";
> +		pwms = <&pwm4 0 1000000 0>;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		framebuffer {
> +			compatible = "simple-framebuffer";
> +			clocks = <&rcc CK_BUS_LTDC>, <&rcc CK_KER_LTDC>;
> +			lcd-supply = <&reg_3v3>;
> +			status = "disabled";
> +		};
> +	};
> +
> +	leds {
> +		compatible = "gpio-leds";
> +
> +		led-0 {
> +			gpios = <&gpioh 2 GPIO_ACTIVE_HIGH>;
> +			default-state = "off";
> +			status = "okay";
> +		};
> +
> +		led-1 {
> +			gpios = <&gpioh 6 GPIO_ACTIVE_HIGH>;
> +			default-state = "off";
> +			status = "okay";
> +		};
> +	};
> +
> +	mclk: clock-mclk {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <24000000>;
> +	};
> +
> +	reg_1v8: regulator-1v8 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "1v8";
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +	};
> +
> +	reg_3v3: regulator-3v3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "3v3";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +	};
> +
> +	reg_ext_pwr: regulator-ext-pwr {
> +		compatible = "regulator-fixed";
> +		regulator-name = "ext-pwr";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		gpio = <&gpiog 0 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +		regulator-always-on;
> +	};
> +
> +	sound {
> +		compatible = "audio-graph-card";
> +		label = "STM32MP25-RMM";
> +		widgets = "Headphone", "Headphone Jack",
> +			  "Microphone", "Microphone Jack";
> +		routing = "Headphone Jack", "HP_OUT",
> +			  "MIC_IN", "Microphone Jack",
> +			  "Microphone Jack", "Mic Bias";
> +		dais = <&sai1a_port &sai1b_port>;
> +		status = "okay";
> +	};
> +};
> +
> +&arm_wdt {
> +	timeout-sec = <32>;
> +	status = "okay";
> +};
> +
> +&i2c1 {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&i2c1_pins_a>;
> +	pinctrl-1 = <&i2c1_sleep_pins_a>;
> +	i2c-scl-rising-time-ns = <185>;
> +	i2c-scl-falling-time-ns = <20>;
> +	status = "okay";
> +	/* spare dmas for other usage */
> +	/delete-property/dmas;
> +	/delete-property/dma-names;
> +
> +	touchscreen at 38 {
> +		compatible = "edt,edt-ft5306";
> +		reg = <0x38>;
> +		interrupt-parent = <&gpiob>;
> +		interrupts = <0 IRQ_TYPE_EDGE_FALLING>;
> +		reset-gpios = <&gpiod 1 GPIO_ACTIVE_LOW>;
> +		touchscreen-size-x = <1280>;
> +		touchscreen-size-y = <800>;
> +	};
> +};
> +
> +&i2c2 {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&i2c2_pins_a>;
> +	pinctrl-1 = <&i2c2_sleep_pins_a>;
> +	i2c-scl-rising-time-ns = <185>;
> +	i2c-scl-falling-time-ns = <20>;
> +	status = "okay";
> +	/* spare dmas for other usage */
> +	/delete-property/dmas;
> +	/delete-property/dma-names;
> +
> +	sgtl5000: codec at a {
> +		compatible = "fsl,sgtl5000";
> +		reg = <0x0a>;
> +		#sound-dai-cells = <0>;
> +		clocks = <&mclk>;
> +
> +		VDDA-supply = <&reg_3v3>;
> +		VDDIO-supply = <&reg_3v3>;
> +		VDDD-supply = <&reg_1v8>;
> +
> +		sgtl5000_port: port {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			sgtl5000_tx_endpoint: endpoint at 0 {
> +				reg = <0>;
> +				remote-endpoint = <&sai1a_endpoint>;
> +				frame-master = <&sgtl5000_tx_endpoint>;
> +				bitclock-master = <&sgtl5000_tx_endpoint>;
> +			};
> +
> +			sgtl5000_rx_endpoint: endpoint at 1 {
> +				reg = <1>;
> +				remote-endpoint = <&sai1b_endpoint>;
> +				frame-master = <&sgtl5000_rx_endpoint>;
> +				bitclock-master = <&sgtl5000_rx_endpoint>;
> +			};
> +		};
> +	};
> +};
> +
> +&ltdc {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&ltdc_pins_a>;
> +	pinctrl-1 = <&ltdc_sleep_pins_a>;
> +	status = "okay";
> +
> +	port {
> +		ltdc_out: endpoint {
> +			remote-endpoint = <&panel_in>;
> +		};
> +	};
> +};
> +
> +&m_can1 {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&m_can1_pins_a>;
> +	pinctrl-1 = <&m_can1_sleep_pins_a>;
> +	status = "okay";
> +};
> +
> +&sai1 {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&sai1a_pins_a>, <&sai1b_pins_a>;
> +	pinctrl-1 = <&sai1a_sleep_pins_a>, <&sai1b_sleep_pins_a>;
> +	status = "okay";
> +};
> +
> +&sai1a {
> +	dma-names = "tx";
> +	status = "okay";
> +
> +	sai1a_port: port {
> +		sai1a_endpoint: endpoint {
> +			remote-endpoint = <&sgtl5000_tx_endpoint>;
> +			dai-format = "i2s";
> +			mclk-fs = <512>;
> +		};
> +	};
> +};
> +
> +&sai1b {
> +	dma-names = "rx";
> +	st,sync = <&sai1a 2>;
> +	clocks = <&rcc CK_KER_SAI1>;
> +	clock-names = "sai_ck";
> +	status = "okay";
> +
> +	sai1b_port: port {
> +		sai1b_endpoint: endpoint {
> +			remote-endpoint = <&sgtl5000_rx_endpoint>;
> +			dai-format = "i2s";
> +			mclk-fs = <512>;
> +		};
> +	};
> +};
> +
> +/* MicroSD */
> +&sdmmc1 {
> +	pinctrl-names = "default", "opendrain", "sleep";
> +	pinctrl-0 = <&sdmmc1_b4_pins_a>;
> +	pinctrl-1 = <&sdmmc1_b4_od_pins_a>;
> +	pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;
> +	broken-cd;
> +	disable-wp;
> +	st,neg-edge;
> +	bus-width = <4>;
> +	vmmc-supply = <&scmi_v3v3>;
> +	vqmmc-supply = <&scmi_vddio1>;
> +	no-1-8-v;
> +	status = "okay";
> +};
> +
> +&spi1 {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&spi1_pins_a>;
> +	pinctrl-1 = <&spi1_sleep_pins_a>;
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	cs-gpios = <&gpioh 8 GPIO_ACTIVE_HIGH>, <&gpioh 3 GPIO_ACTIVE_HIGH>;
> +	status = "okay";
> +
> +	display: display at 0 {
> +		compatible = "rocktech,rk050hr345-ct106a", "ilitek,ili9806e";
> +		reg = <0>;
> +		vdd-supply = <&reg_3v3>;
> +		spi-max-frequency = <10000000>;
> +		reset-gpios = <&gpiob 6 GPIO_ACTIVE_LOW>;
> +		backlight = <&backlight>;
> +
> +		port {
> +			panel_in: endpoint {
> +				remote-endpoint = <&ltdc_out>;
> +			};
> +		};
> +	};
> +};
> +
> +&timers2 {
> +	status = "okay";
> +
> +	pwm2: pwm {
> +		pinctrl-0 = <&pwm2_pins_a>;
> +		pinctrl-1 = <&pwm2_sleep_pins_a>;
> +		pinctrl-names = "default", "sleep";
> +		status = "okay";
> +	};
> +};
> +
> +&timers4 {
> +	status = "okay";
> +
> +	pwm4: pwm {
> +		pinctrl-names = "default", "sleep";
> +		pinctrl-0 = <&pwm4_pins_a>;
> +		pinctrl-1 = <&pwm4_sleep_pins_a>;
> +		status = "okay";
> +	};
> +};
> +
> +&usart1 {
> +	pinctrl-names = "default", "idle", "sleep";
> +	pinctrl-0 = <&usart1_pins_b>;
> +	pinctrl-1 = <&usart1_idle_pins_b>;
> +	pinctrl-2 = <&usart1_sleep_pins_b>;
> +	/delete-property/ dmas;
> +	/delete-property/ dma-names;
> +	status = "okay";
> +};
> +
> +&usart2 {
> +	pinctrl-names = "default", "idle", "sleep";
> +	pinctrl-0 = <&usart2_pins_a>;
> +	pinctrl-1 = <&usart2_idle_pins_a>;
> +	pinctrl-2 = <&usart2_sleep_pins_a>;
> +	/delete-property/ dmas;
> +	/delete-property/ dma-names;
> +	status = "okay";
> +};

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