I don't understand the hex numbers used on the pin configuration:
main_mmc2_pins_default: main-mmc2-pins-default { pinctrl-single,pins = < AM62X_IOPAD(0x120, PIN_INPUT, 0) /* (C24) MMC2_CMD */ AM62X_IOPAD(0x118, PIN_INPUT, 0) /* (D25) MMC2_CLK */ AM62X_IOPAD(0x114, PIN_INPUT, 0) /* (B24) MMC2_DAT0 */ AM62X_IOPAD(0x110, PIN_INPUT, 0) /* (C25) MMC2_DAT1 */ AM62X_IOPAD(0x10c, PIN_INPUT, 0) /* (E23) MMC2_DAT2 */ AM62X_IOPAD(0x108, PIN_INPUT, 0) /* (D24) MMC2_DAT3 */ AM62X_IOPAD(0x11c, PIN_INPUT, 0) /* (#N/A) MMC2_CLKB */ >; };
I'm trying to use pin "IO_EXP_TEST_LED" on the "TCA64WRARGJR" IO Expander, but don't know what configuration I need.
I find on "k3-am625-sk.dts" this:
&main_i2c1 { exp1: gpio@22 { compatible = "ti,tca6424"; reg = <0x22>; gpio-controller; #gpio-cells = <2>; gpio-line-names = "GPIO_CPSW2_RST", "GPIO_CPSW1_RST", "PRU_DETECT", "MMC1_SD_EN", "VPP_LDO_EN", "EXP_PS_3V3_En", "EXP_PS_5V0_En", "EXP_HAT_DETECT", "GPIO_AUD_RSTn", "GPIO_eMMC_RSTn", "UART1_FET_BUF_EN", "WL_LT_EN", "GPIO_HDMI_RSTn", "CSI_GPIO1", "CSI_GPIO2", "PRU_3V3_EN", "HDMI_INTn", "PD_I2C_IRQ", "MCASP1_FET_EN", "MCASP1_BUF_BT_EN", "MCASP1_FET_SEL", "UART1_FET_SEL", "TSINT#", "IO_EXP_TEST_LED"; interrupt-parent = <&main_gpio1>; interrupts = <23 IRQ_TYPE_EDGE_FALLING>; interrupt-controller; #interrupt-cells = <2>; pinctrl-names = "default"; pinctrl-0 = <&main_gpio1_ioexp_intr_pins_default>; }; };
and then later I see that the phandle "exp1" is being used like this:
wlan_lten: regulator-6 { compatible = "regulator-fixed"; regulator-name = "wlan_lten"; regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; vin-supply = <&vcc_3v3_sys>; gpios = <&exp1 11 GPIO_ACTIVE_LOW>; };
So I imagine I would have to do something similar?