Re: [PATCH v5 5/6] arm64: dts: imx8mm: imx8mp: Add FIO1 DTOs for Data Modul i.MX8M Mini and Plus eDM SBC

From: Frank Li

Date: Mon Jul 27 2026 - 13:04:59 EST

On Thu, Jul 16, 2026 at 07:56:57AM +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.
>
> Signed-off-by: Marek Vasut <marex@xxxxxxxxxxxx>
> ---
> Cc: Conor Dooley <conor+dt@xxxxxxxxxx>
> Cc: Fabio Estevam <festevam@xxxxxxxxx>
> Cc: Frank Li <Frank.Li@xxxxxxx>
> Cc: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
> Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
> Cc: Rob Herring <robh@xxxxxxxxxx>
> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: imx@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
> V2: Deduplicate the DTOs further
> V3: New patch split from the original megapatch
> V4: Rebase on next-20260703
> V5: No change
> ---
> arch/arm64/boot/dts/freescale/Makefile | 12 ++++
> ...l-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi | 69 +++++++++++++++++++
> ...l-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso | 59 ++++++++++++++++
> ...l-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso | 46 +++++++++++++
> 4 files changed, 186 insertions(+)
> create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi
> create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso
> create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso
>
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index 21902f095bf49..43ffdd70ce2e1 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -124,6 +124,10 @@ imx8mm-data-modul-edm-sbc-overlay-cm4-dtbs := \
> imx8mm-data-modul-edm-sbc.dtb \
> imx8mm-data-modul-edm-sbc-overlay-cm4.dtbo
>
> +imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-dtbs := \
> + imx8mm-data-modul-edm-sbc.dtb \
> + imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtbo
> +
> imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi-dtbs := \
> imx8mm-data-modul-edm-sbc.dtb \
> imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi.dtbo
> @@ -163,6 +167,8 @@ imx8mm-data-modul-edm-sbc-overlay-edm-sbc-imx8mm-rev900-dtbs := \
> dtb-$(CONFIG_ARCH_MXC) += imx8mm-data-modul-edm-sbc.dtb \
> imx8mm-data-modul-edm-sbc-overlay-cm4.dtb \
> imx8mm-data-modul-edm-sbc-overlay-cm4.dtbo \
> + imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtb \
> + imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtbo \
> imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi.dtb \
> imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi.dtbo \
> imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-lvds-g070y2-l01.dtb \
> @@ -311,6 +317,10 @@ imx8mp-data-modul-edm-sbc-overlay-cm7-dtbs := \
> imx8mp-data-modul-edm-sbc.dtb \
> imx8mp-data-modul-edm-sbc-overlay-cm7.dtbo
>
> +imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-dtbs := \
> + imx8mp-data-modul-edm-sbc.dtb \
> + imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtbo
> +
> imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi-dtbs := \
> imx8mp-data-modul-edm-sbc.dtb \
> imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi.dtbo
> @@ -392,6 +402,8 @@ imx8mp-data-modul-edm-sbc-overlay-edm-sbc-imx8mp-rev902-dtbs := \
> dtb-$(CONFIG_ARCH_MXC) += imx8mp-data-modul-edm-sbc.dtb \
> imx8mp-data-modul-edm-sbc-overlay-cm7.dtb \
> imx8mp-data-modul-edm-sbc-overlay-cm7.dtbo \
> + imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtb \
> + imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtbo \
> imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi.dtb \
> imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-hdmi.dtbo \
> imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-lvds-g070y2-l01.dtb \
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi
> new file mode 100644
> index 0000000000000..7851ca73ccd8e
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi
> @@ -0,0 +1,69 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright 2026 Marek Vasut
> + */
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +&{/} {
> + can_osc: can-osc {
> + compatible = "fixed-clock";
> + #clock-cells = <0>;
> + clock-frequency = <20000000>;
> + };
> +};
> +
> +&ecspi2 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
> +
> + can_fio: can@0 {
> + compatible = "microchip,mcp2515";
> + reg = <0>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_can>;
> + clocks = <&can_osc>;
> + spi-max-frequency = <5000000>;
> + };
> +};
> +
> +&i2c_feature { /* Feature connector I2C */
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + gpio_feature: io-expander@20 {
> + compatible = "nxp,pca9554";
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_gpio_expander>;
> + reg = <0x20>;

compatible is first property, reg is second.

Frank

> + #gpio-cells = <2>;
> + gpio-controller;
> + #interrupt-cells = <2>;
> + interrupt-controller;
> + interrupt-parent = <&gpio4>;
> + interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
> + gpio-line-names =
> + "GPIO1_output", "GPIO1_input",
> + "GPIO2_output", "GPIO2_input",
> + "GPIO3_output", "GPIO3_input",
> + "PCA9511A_READY", "";
> + };
> +
> + eeprom@50 {
> + compatible = "atmel,24c32";
> + reg = <0x50>;
> + pagesize = <32>;
> + };
> +};
> +
> +&uart1 { /* J500/J501 */
> + status = "okay";
> +};
> +
> +&uart2 { /* RS485 J302/J303 */
> + linux,rs485-enabled-at-boot-time;
> + uart-has-rtscts;
> + status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso
> new file mode 100644
> index 0000000000000..ad410db5f5b76
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso
> @@ -0,0 +1,59 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright 2022-2026 Marek Vasut
> + */
> +/dts-v1/;
> +/plugin/;
> +
> +#include "imx8mm-pinfunc.h"
> +#include "imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi"
> +
> +&{/} {
> + beeper {
> + compatible = "pwm-beeper";
> + beeper-hz = <1000>;
> + pwms = <&pwm3 0 250000 0>;
> + };
> +};
> +
> +&can_fio {
> + interrupts-extended = <&gpio4 25 IRQ_TYPE_LEVEL_LOW>;
> +};
> +
> +&iomuxc {
> + pinctrl_can: can-feature-grp {
> + fsl,pins = <
> + /* CAN_INT# */
> + MX8MM_IOMUXC_SAI2_TXC_GPIO4_IO25 0x400000d6
> + /* CAN_RST# */
> + MX8MM_IOMUXC_SAI2_TXD0_GPIO4_IO26 0x6
> + >;
> + };
> +
> + pinctrl_gpio_expander: gpio-expander-feature-grp {
> + fsl,pins = <
> + /* GPIO4_IO27 */
> + MX8MM_IOMUXC_SAI2_MCLK_GPIO4_IO27 0x6
> + >;
> + };
> +
> + pinctrl_pwm3: pwm3-buzzer-feature-grp {
> + fsl,pins = <
> + /* Buzzer PWM output */
> + MX8MM_IOMUXC_SPDIF_TX_PWM3_OUT 0x100
> + >;
> + };
> +};
> +
> +&pinctrl_hog_feature {
> + fsl,pins = <
> + /* GPIO5_IO04 */
> + MX8MM_IOMUXC_SPDIF_RX_GPIO5_IO4 0x6
> + >;
> +};
> +
> +&pwm3 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_pwm3>;
> + status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso b/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso
> new file mode 100644
> index 0000000000000..0eccb7f7c0a8c
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtso
> @@ -0,0 +1,46 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright 2022-2026 Marek Vasut
> + */
> +/dts-v1/;
> +/plugin/;
> +
> +#include "imx8mp-pinfunc.h"
> +#include "imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1.dtsi"
> +
> +&can_fio {
> + interrupts-extended = <&gpio2 10 IRQ_TYPE_LEVEL_LOW>;
> +};
> +
> +&iomuxc {
> + pinctrl_can: can-feature-grp {
> + fsl,pins = <
> + /* CAN_INT# */
> + MX8MP_IOMUXC_SD1_RESET_B__GPIO2_IO10 0x400000d6
> + >;
> + };
> +
> + pinctrl_gpio_expander: gpio-expander-feature-grp {
> + fsl,pins = <
> + /* GPIO4_IO27 */
> + MX8MP_IOMUXC_SAI2_MCLK__GPIO4_IO27 0x6
> + >;
> + };
> +};
> +
> +&pinctrl_sai2 {
> + fsl,pins = <
> + MX8MP_IOMUXC_SAI2_TXFS__AUDIOMIX_SAI2_TX_SYNC 0xd6
> + MX8MP_IOMUXC_SAI2_TXD0__AUDIOMIX_SAI2_TX_DATA00 0xd6
> + MX8MP_IOMUXC_SAI2_TXC__AUDIOMIX_SAI2_TX_BCLK 0xd6
> + >;
> +};
> +
> +&pinctrl_hog_feature {
> + fsl,pins = <
> + /* GPIO5_IO03 */
> + MX8MP_IOMUXC_GPIO1_IO07__GPIO1_IO07 0x40000006
> + /* GPIO5_IO04 */
> + MX8MP_IOMUXC_GPIO1_IO08__GPIO1_IO08 0x40000006
> + >;
> +};
> --
> 2.53.0
>