Re: [PATCH v1 2/4] arm64: dts: imx8mq-nitrogen: add USB HOST support
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
Date: 2021-03-30 08:39:36
Also in:
linux-arm-kernel, lkml
Hello Adrien, On 30.03.21 10:35, Adrien Grassein wrote:
Add the description for the USB host port. At this time, the port will not work directly from the kernel because it's connected through a resettable hub that is not handle in the kernel. It should be controlled in the bootloader or in the userspace.
Couldn't you add a gpio-hog that gets the hub out of reset? Cheers, Ahmad
quoted hunk ↗ jump to hunk
In the case of the Boundary's u-boot, this is done on the boot script: " starting USB... Bus usb@38100000: Register 2000140 NbrPorts 2 Starting the controller USB XHCI 1.10 Bus usb@38200000: Register 2000140 NbrPorts 2 Starting the controller USB XHCI 1.10 scanning bus usb@38100000 for devices... 1 USB Device(s) found scanning bus usb@38200000 for devices... 3 USB Device(s) found " Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com> --- .../boot/dts/freescale/imx8mq-nitrogen.dts | 22 +++++++++++++++++++ 1 file changed, 22 insertions(+)diff --git a/arch/arm64/boot/dts/freescale/imx8mq-nitrogen.dts b/arch/arm64/boot/dts/freescale/imx8mq-nitrogen.dts index b46f45a82be1..7a52e247c527 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-nitrogen.dts +++ b/arch/arm64/boot/dts/freescale/imx8mq-nitrogen.dts@@ -213,6 +213,22 @@ &usb3_phy0 { status = "okay"; }; +&usb_dwc3_1 { + dr_mode = "host"; + status = "okay"; +}; + +/* + * On this board, USB host is connected to a resettable hub. + * The reset signal is connected to the GPIO <&gpio1 14 GPIO_ACTIVE_LOW>. + * You need to activate it in the bootloader or in the userspace. + */ +&usb3_phy1 { + status = "okay"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_usb3_1>; +}; + &usdhc1 { assigned-clocks = <&clk IMX8MQ_CLK_USDHC1>; assigned-clock-rates = <400000000>;@@ -388,6 +404,12 @@ MX8MQ_IOMUXC_GPIO1_IO13_USB1_OTG_OC 0x16 >; }; + pinctrl_usb3_1: usb3-1grp { + fsl,pins = < + MX8MQ_IOMUXC_GPIO1_IO14_GPIO1_IO14 0x16 + >; + }; + pinctrl_usdhc1: usdhc1grp { fsl,pins = < MX8MQ_IOMUXC_SD1_CLK_USDHC1_CLK 0x83
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