[PATCH] rockchip: Enable usb gadget on Radxa ROCK 5C

[Arnaud Patard]

I was testing DFU and SPL DFU [1] on my rock 5c. To get it working,
I had to set the usb_host0_xhci node to peripheral and maximum speed
to high speed, as done for other rk3588 devices.

For DFU (and not SPL DFU), I had to set the "maximum-speed" property on the
usbdp_phy0 node, otherwise it's failing:
=> dfu 0 ram 0
rockchip_udphy phy at fed80000: cmn ana lcpll lock timeout
rockchip_udphy phy at fed80000: failed to init usbdp combophy
rockchip_udphy phy at fed80000: PHY: Failed to init phy at fed80000: -110.
rockchip_udphy phy at fed80000: cmn ana lcpll lock timeout
rockchip_udphy phy at fed80000: failed to init usbdp combophy
rockchip_udphy phy at fed80000: PHY: Failed to init phy at fed80000: -110.
No USB device found
udc_device_get_by_index failed

The issue is that it's trying to configure the usb3 phy, which is not
the one used for peripheral mode. I've not checked on other rk3588 devices
if they would need a similar change.

[1] for SPL DFU, I've used the serie https://patchwork.ozlabs.org/project/uboot/list/?series=443761

Signed-off-by: Arnaud Patard <arnaud.patard at collabora.com>
---
 arch/arm/dts/rk3588s-rock-5c-u-boot.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/dts/rk3588s-rock-5c-u-boot.dtsi b/arch/arm/dts/rk3588s-rock-5c-u-boot.dtsi
index 1dc574c2f21..54b0f914010 100644
--- a/arch/arm/dts/rk3588s-rock-5c-u-boot.dtsi
+++ b/arch/arm/dts/rk3588s-rock-5c-u-boot.dtsi
@@ -9,3 +9,15 @@
 	cap-mmc-highspeed;
 	mmc-hs200-1_8v;
 };
+
+&usb_host0_xhci {
+	bootph-pre-ram;
+	bootph-some-ram;
+	dr_mode = "peripheral";
+	maximum-speed = "high-speed";
+};
+
+&usbdp_phy0 {
+	bootph-all;
+	maximum-speed = "high-speed";
+};
-- 
2.39.5