Re: [PATCH v2] arm64: dts: imx8mm: imx8mp: Add DTOs for Data Modul i.MX8M Mini and Plus eDM SBC

[Frank Li]

On Mon, Apr 06, 2026 at 11:58:45PM +0200, Marek Vasut wrote:
> Add DT overlay for feature connector expansion module eDM-MOD-iMX8Mm-FIO1
> providing additional UARTs, CAN, PWM Beeper, I2C, SPI and GPIO breakout.
> This adapter can be optionally populated onto the eDM SBC.
>
> Add DT overlay for the DSI-to-HDMI adapter eDM-MOD-iMX8Mm-HDMI populated
> with Lontium LT9611 bridge. This adapter can be optionally populated onto
> the eDM SBC.
>
> Add DT overlay for the DSI-to-LVDS adapter eDM-MOD-iMX8Mm-LVDS populated
> with Lontium LT9211 bridge. This adapter can be optionally populated onto
> the eDM SBC. This adapter can be extended with multiple panels, currently
> supported are the following:

At least you can split to 3 patches to add these.

...
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-audio.dtso b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-audio.dtso
> new file mode 100644
> index 0000000000000..f446938b74006
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-audio.dtso
> @@ -0,0 +1,80 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright 2024-2026 Marek Vasut
> + */
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/clock/imx8mm-clock.h>
> +
> +#include "imx8mm-pinfunc.h"
> +#include "imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-audio.dtsi"
> +
> +&can_fio {
> +	interrupts-extended = <&gpio4 25 IRQ_TYPE_LEVEL_LOW>;

Now, I have not good ways to unify this information for difference boards
yet. It is quite common user case, let me think more.

> +};
> +
> +&iomuxc {
> +	pinctrl_codec_mclk: codec-mclk_feature-grp {
> +		fsl,pins = <
> +			/* GPIO4_IO27 */
> +			MX8MM_IOMUXC_SAI2_MCLK_SAI5_MCLK		0x2
> +		>;
> +	};
> +
> +	pinctrl_sai2: sai2_feature-grp {
> +		fsl,pins = <
> +			MX8MM_IOMUXC_SAI2_RXC_SAI2_RX_BCLK		0x90
> +			MX8MM_IOMUXC_SAI2_TXD0_SAI2_TX_DATA0		0x96
> +			MX8MM_IOMUXC_SAI2_RXD0_SAI2_RX_DATA0		0x90
> +			MX8MM_IOMUXC_SAI2_TXFS_SAI2_TX_SYNC		0x96
> +		>;
> +	};

I think this part should be in main boards's dts file, there should have
hardware plug header, which include these signals.

If there are other added on boards, add-on dtso can resuse the label,
pinctrl_sai2 and pinctrl_codec_mclk.

> +};
> +
> +&pinctrl_hog_feature {
> +	fsl,pins = <
> +		/* GPIO5_IO03 */
> +		MX8MM_IOMUXC_SPDIF_TX_GPIO5_IO3				0x40000006
> +		/* GPIO5_IO04 */
> +		MX8MM_IOMUXC_SPDIF_RX_GPIO5_IO4				0x40000006
> +
> +		/* CAN_INT# */
> +		MX8MM_IOMUXC_SAI2_TXC_GPIO4_IO25			0x40000090
> +	>;
> +};
> +
> +&sai2 {
> +	assigned-clocks = <&clk IMX8MM_CLK_SAI2>;
> +	assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
> +	fsl,sai-bit-clock-swap;
> +};
> +
> +&sgtl5000_fio {
> +	VDDA-supply = <&buck4_reg>;
> +	VDDD-supply = <&buck5_reg>;
> +	VDDIO-supply = <&buck4_reg>;

buck4_reg can provide addtional label, such as porta_vdd ..., so needn't
this sections.

> +};
> +
> +&spba2 {
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	sai5clk: clock-controller@30050000 {	/* SAI5 */
> +		compatible = "fsl,imx8mm-sai-clock", "fsl,imx8mq-sai-clock";
> +		reg = <0x30050000 0x10000>;
> +		#clock-cells = <1>;

Not sure why need overwrite these informaiton here, suppose it should be
the same for Soc.

Frank