apalis-imx8: add USBH_EN gpio hog

USB host interface is not working on some Apalis Toradex carrier
boards with Apalis iMX8 SoM. This is due to USBH_EN pin, which
powers USB peripherals, having a strong pull-down on some boards,
and a weak pull-down on the others. This USBH_EN pin is left
unconfigured, which means it is in its default state at cold boot:
input with a strong pull-up. As a result, carrier boards with a
weak pull-down have this signal high enough to trigger power
delivery to USB peripherals, and opposite - boards with strong
pull-down on USBH_EN have this signal below the threshold needed
to trigger USB power delivery.
This change configures the USBH_EN pin as gpio hog, fixing this
issue for all Apalis carrier boards regardless of pull-down
resistor value.

Also, update apalis-imx8_defconfig via savedefconfig.

Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

diff --git a/arch/arm/dts/fsl-imx8qm-apalis-u-boot.dtsi b/arch/arm/dts/fsl-imx8qm-apalis-u-boot.dtsi
index f2d6b183ed9a12df3e218aef70837acda5294bbe..c54a59e89c5d158c43c78753785904771d42e1d1 100644 (file)
--- a/arch/arm/dts/fsl-imx8qm-apalis-u-boot.dtsi
+++ b/arch/arm/dts/fsl-imx8qm-apalis-u-boot.dtsi
@@ -93,6 +93,12 @@
 
 &gpio4 {
        bootph-some-ram;
+
+       usbh_en {
+               gpio-hog;
+               gpios = <4 GPIO_ACTIVE_HIGH>;
+               output-high;
+       };
 };
 
 &gpio5 {

diff --git a/configs/apalis-imx8_defconfig b/configs/apalis-imx8_defconfig
index 056c1fbacfca32012d4d4cea40cc8d45371f6845..d11a31ee641757e0cff546905e4d3e0cdb615140 100644 (file)
--- a/configs/apalis-imx8_defconfig
+++ b/configs/apalis-imx8_defconfig
@@ -65,6 +65,7 @@ CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_BOOTCOUNT_ENV=y
 CONFIG_CLK_IMX8=y
 CONFIG_CPU=y
+CONFIG_GPIO_HOG=y
 CONFIG_MXC_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_IMX_LPI2C=y