About device tree on imx8mm-evk

[takeshi100]

Hi, 

■Question on imx8mm-evk

1. What is the role of MX8MM_IOMUXC_GPIO1_IO00_ANAMIX_REF_CLK_32K? 
2. What is the role of MX8MM_IOMUXC_SD1_DATA7_GPIO2_IO9?

3. Which pin on the NXP 88W8987 is MX8MM_IOMUXC_SD1_DATA7_GPIO2_IO9 connected to?

4. Which pin on the NXP 88W8987 is MX8MM_IOMUXC_SD1_RESET_B_GPIO2_IO10 connected to?

■imx8mm-evk.dts
-----------------------

&usdhc1 {

pinctrl-names = "default", "state_100mhz", "state_200mhz";

pinctrl-0 = <&pinctrl_usdhc1>, <&pinctrl_wlan>;

pinctrl-1 = <&pinctrl_usdhc1_100mhz>, <&pinctrl_wlan>;

pinctrl-2 = <&pinctrl_usdhc1_200mhz>, <&pinctrl_wlan>;

bus-width = <4>;

keep-power-in-suspend;

non-removable;

wakeup-source;

vmmc-supply = <&reg_usdhc1_vmmc>;

fsl,sdio-async-interrupt-enabled;

status = "okay";

wifi_wake_host {

compatible = "nxp,wifi-wake-host";

interrupt-parent = <&gpio2>;

interrupts = <9 IRQ_TYPE_LEVEL_LOW>;

interrupt-names = "host-wake";

};

-----------------------

-----------------------

reg_usdhc1_vmmc: regulator-usdhc1 {
compatible = "regulator-fixed";
regulator-name = "WLAN_EN";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_reg_usdhc1_vmmc>;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
gpio = <&gpio2 10 GPIO_ACTIVE_HIGH>;
enable-active-high;
};

pinctrl_reg_usdhc1_vmmc: regusdhc1vmmcgrp {

fsl,pins = <

MX8MM_IOMUXC_SD1_RESET_B_GPIO2_IO10 0x141

>;

};

-----------------------

-----------------------

pinctrl_wlan: wlangrp {

fsl,pins = <

MX8MM_IOMUXC_GPIO1_IO00_ANAMIX_REF_CLK_32K 0x141

MX8MM_IOMUXC_SD1_DATA7_GPIO2_IO9 0x159

>;

-----------------------

[JorgeCas · Accepted solution]

Hello,

1. It configures the pin as alternative CCM_REF_CLK_32K, on our EVK is connected to 2.4G/5G WIFI/BT Module.

2. It configures the pin as alternative GPIO2_IO09 for SDIO_INTERRUPT, on our EVK is connected to 2.4G/5G WIFI/BT Module.

3. Pin W26 and pin 13.

3. Pin R23 and pin 39.

Best regards.