[PATCH 3/4] arm64: dts: imx8mm-venice-gw7901: add support for USB hub subload

[Tim Harvey]

On Tue, Jun 1, 2021 at 10:49 AM Tim Harvey <tharvey at gateworks.com> wrote:
>
> The USB hub has it's reset as GPIO4_IO17 but can be sub-loaded and
> VBUS provided by a VBUS regulator with GPIO4_IO2 as the enable and
> GPIO1_IO15 as the active-low over-current.
>
> Enable pull-up for GPIO4_IO17 to keep hub out of reset and move VBUS
> enable to GPIO4_IO2. Additionally enable pull-up on GPIO1_IO15 so that
> if the hub is loaded it never over-currents.
>
> This allows USB to work in both configurations without a device-tree
> change.
>
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> index 5a1e9df39bec..db43ee28bdb6 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> @@ -216,7 +216,7 @@
>                 pinctrl-0 = <&pinctrl_reg_usb2>;
>                 compatible = "regulator-fixed";
>                 regulator-name = "usb_usb2_vbus";
> -               gpio = <&gpio4 17 GPIO_ACTIVE_HIGH>;
> +               gpio = <&gpio4 2 GPIO_ACTIVE_HIGH>;
>                 enable-active-high;
>                 regulator-min-microvolt = <5000000>;
>                 regulator-max-microvolt = <5000000>;
> @@ -824,8 +824,9 @@
>
>         pinctrl_reg_usb2: regusb1grp {
>                 fsl,pins = <
> -                       MX8MM_IOMUXC_SAI1_TXD5_GPIO4_IO17       0x41
> -                       MX8MM_IOMUXC_GPIO1_IO15_USB2_OTG_OC     0x41
> +                       MX8MM_IOMUXC_SAI1_RXD0_GPIO4_IO2        0x41
> +                       MX8MM_IOMUXC_SAI1_TXD5_GPIO4_IO17       0x140
> +                       MX8MM_IOMUXC_GPIO1_IO15_USB2_OTG_OC     0x140
>                 >;
>         };
>
> --
> 2.17.1
>

Shawn,

Is there anything you want changed here?

Best regards,

Tim