config-pin: migrate to gpio-aggregator (beagley-ai guinea pig)

(all node names are up for discussion, would like to mirror mainline usage as much as possible)

node name syntax: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/ti/omap/am335x-pocketbeagle.dts?h=v6.9-rc6#n221

P2_03_gpio: P2-03-gpio-pins {

Thus i propose: exp_08_gpio: exp-08-gpio-pins {

gpio-aggregator: https://docs.kernel.org/admin-guide/gpio/gpio-aggregator.html driver: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpio/gpio-aggregator.c?h=v6.9-rc6

Default boot up array: (assume all 40 pins)

	hat-array {
		compatible = "gpio-array";
		pinctrl-names = "default";
		pinctrl-0 = <&exp_03_gpio>, <&exp_05_gpio>, <&exp_08_gpio>, <&exp_10_gpio>;

		gpios = <&mcu_gpio0 2 GPIO_ACTIVE_HIGH>,
				<&mcu_gpio0 3 GPIO_ACTIVE_HIGH>,
				<&main_gpio1 14 GPIO_ACTIVE_HIGH>,
				<&main_gpio1 15 GPIO_ACTIVE_HIGH>;
		gpio-line-names = "ID_SDA", "ID_SCL", "GPIO2", "GPIO3";
	};

hat peripheral

	hat-uart-ttyAMA0 {
		compatible = "gpio-peripheral";
		pinctrl-names = "default";
		pinctrl-0 = <&exp_08_uart>, <&exp_10_uart>;

		gpios = <&main_gpio1 14 GPIO_ACTIVE_HIGH>,
				<&main_gpio1 15 GPIO_ACTIVE_HIGH>;
		gpio-line-names = "UART1_TXD", "UART1_RXD";
	};

Single Pin...

	hat-08-gpio {
		compatible = "gpio-single";
		pinctrl-names = "default";
		pinctrl-0 = <&exp_08_gpio>;

		gpios = <&main_gpio1 14 GPIO_ACTIVE_HIGH>;
		gpio-line-names = "UART1_TXD";
	};

	hat-08-uart-txd0 {
		compatible = "gpio-single";
		pinctrl-names = "default";
		pinctrl-0 = <&exp_08_uart>;

		gpios = <&main_gpio1 14 GPIO_ACTIVE_HIGH>;
		gpio-line-names = "UART1_TXD";
	};

	hat-10-gpio {
		compatible = "gpio-single";
		pinctrl-names = "default";
		pinctrl-0 = <&exp_10_gpio>;

		gpios = <&main_gpio1 15 GPIO_ACTIVE_HIGH>;
		gpio-line-names = "UART1_TXD";
	};

	hat-10-uart1-rxd {
		compatible = "gpio-single";
		pinctrl-names = "default";
		pinctrl-0 = <&exp_10_uart>;

		gpios = <&main_gpio1 15 GPIO_ACTIVE_HIGH>;
		gpio-line-names = "UART1_RXD";
	};

pin mux defines:

	exp_08_gpio: exp-08-gpio-pins {
		pinctrl-single,pins = <
			J722S_IOPAD(0x01b0, PIN_INPUT, 7) /* (F24) MCASP0_ACLKR.GPIO1_14 */
		>;
	};

	exp_08_uart: exp-08-uart-pins {
		pinctrl-single,pins = <
			J722S_IOPAD(0x01b0, PIN_OUTPUT, 2) /* (F24) MCASP0_ACLKR.UART1_TXD */
		>;
	};

	exp_10_gpio: exp-10-gpio-pins {
		pinctrl-single,pins = <
			J722S_IOPAD(0x01ac, PIN_INPUT, 7) /* (C27) MCASP0_AFSR.GPIO1_13 */
		>;
	};

	exp_10_uart: exp-10-uart-pins {
		pinctrl-single,pins = <
			J722S_IOPAD(0x01ac, PIN_INPUT, 2) /* (C27) MCASP0_AFSR.UART1_RXD */
		>;
	};

	exp_03_gpio: exp-03-gpio-pins {
		pinctrl-single,pins = <
			J722S_MCU_IOPAD(0x0048, PIN_INPUT, 7) /* (E11) MCU_I2C0_SDA.MCU_GPIO0_18 */
		>;
	};

	exp_05_gpio: exp-05-gpio-pins {
		pinctrl-single,pins = <
			J722S_MCU_IOPAD(0x0044, PIN_INPUT, 7) /* (B13) MCU_I2C0_SCL.MCU_GPIO0_17 */
		>;
	};

Planned peripheral

• gpio
• usart
• i2c
• spi
• pruin
• pruout
• can
• pwm
• i2s (dt might have other config options)

Not Planned

• video

Comparsions

Some RPI comparsions: https://github.com/bobrathbone/GPIOconverter