Enable host mode USB for Milk-V Mars by setting host mode and connect vbus 
pinctrl.

Note that testing this functionality depends on two features:

1.  commit e10c52e7e064038d9bd67b20bf4ce92077d7d84e "phy: starfive: 
jh7110-usb: Fix link configuration to controller"

2. Setting the USB over-current register to disable. This is done at 
bootloader phase, for example U-Boot: 
https://patchwork.ozlabs.org/project/uboot/patch/20241012031328.4268-6-minda.chen@starfivetech.com/

If the over-current register is not prepared for us then the result is no 
change in functional outcome with this patch applied; there is an error 
visible to the user and usb configuration fails (same as it is now).

Signed-off-by: E Shattow <e@freeshell.de>
---
 .../boot/dts/starfive/jh7110-milkv-mars.dts    | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/boot/dts/starfive/jh7110-milkv-mars.dts b/arch/riscv/boot/dts/starfive/jh7110-milkv-mars.dts
index 0d248b671d4b..bddfc7c6b00f 100644
--- a/arch/riscv/boot/dts/starfive/jh7110-milkv-mars.dts
+++ b/arch/riscv/boot/dts/starfive/jh7110-milkv-mars.dts
@@ -53,7 +53,23 @@ &spi0 {
 	status = "okay";
 };
 
+&sysgpio {
+	usb_pins: usb0-0 {
+		driver-vbus-pin {
+			pinmux = <GPIOMUX(25, GPOUT_SYS_USB_DRIVE_VBUS,
+					      GPOEN_ENABLE,
+					      GPI_NONE)>;
+			bias-disable;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+	};
+};
+
 &usb0 {
-	dr_mode = "peripheral";
+	dr_mode = "host";
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb_pins>;
 	status = "okay";
 };
-- 
2.45.2

On Thu, 14 Nov 2024 12:13:40 -0800, E Shattow wrote:
> Enable host mode USB for Milk-V Mars by setting host mode and connect vbus
> pinctrl.
> 
> Note that testing this functionality depends on two features:
> 
> 1.  commit e10c52e7e064038d9bd67b20bf4ce92077d7d84e "phy: starfive:
> jh7110-usb: Fix link configuration to controller"
> 
> 2. Setting the USB over-current register to disable. This is done at
> bootloader phase, for example U-Boot:
> https://patchwork.ozlabs.org/project/uboot/patch/20241012031328.4268-6-minda.chen@starfivetech.com/
> 
> If the over-current register is not prepared for us then the result is no
> change in functional outcome with this patch applied; there is an error
> visible to the user and usb configuration fails (same as it is now).
> 
> Signed-off-by: E Shattow <e@freeshell.de>
> ---
>  .../boot/dts/starfive/jh7110-milkv-mars.dts    | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 


My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

  pip3 install dtschema --upgrade


New warnings running 'make CHECK_DTBS=y starfive/jh7110-milkv-mars.dtb' for 20241114201805.24143-2-e@freeshell.de:

arch/riscv/boot/dts/starfive/jh7110-milkv-mars.dtb: pinctrl@13040000: usb0-0: 'driver-vbus-pin' does not match any of the regexes: '-pins$', 'pinctrl-[0-9]+'
	from schema $id: http://devicetree.org/schemas/pinctrl/starfive,jh7110-sys-pinctrl.yaml#