topic linux usbotg vbus regulator device tree in i.MX Processors

linux usbotg vbus regulator device tree

christoph8446 — Thu, 17 May 2018 13:01:39 GMT

Hello,

Can you please explain what the device tree Settings below will make? I use the

PAD_KEY_ROW4__GPIO4_IO15 in u-boot to switch on 5v on vbus via IC.

Can the USB_OTG_VBUS pin on i.MX6 also provide 5V via the vbus regulator-fixed settings in device tree or where does the Regulator provide it's Output?

vbus1_regulator: regulator@1 {
     compatible = "regulator-fixed";
     regulator-name = "vbus1_regulator";
     regulator-min-microvolt = <5000000>;
     regulator-max-microvolt = <5000000>;
     gpio = <&gpio4 15 GPIO_ACTIVE_HIGH>;
     enable-active-high;
};

&usbotg {
/*vbus-supply = <&vbus1_regulator>;*/
dr_mode = "host";
status = "okay";
};

Thanks!

Chris

Re: linux usbotg vbus regulator device tree

igorpadykov — Sun, 20 May 2018 22:53:20 GMT

Hi Chris

one can look at example of EIM_D22 as such regulator:

pinctrl_usbotg: usbotggrp { MX6QDL_PAD_EIM_D22__GPIO3_IO22 0x000b0 ..
reg_usb_otg_vbus: regulator@1 { gpio = <&gpio3 22 0>;
enable-active-high;
https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm/boot/dts/imx6q-arm2.dts?h=imx_4.1.15_2.0.0_ga

Best regards
igor
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