[PATCH 1/2] arm64: dts: rockchip: Fix VCCIO4/VCCIO6 supplies on NanoPi R2S Plus

[Deomid rojer Ryabkov]

The NanoPi R2S Plus inherits its io-domain supplies from the NanoPi R2S,
but the two boards are wired differently. From sheet 6 of the schematics:

NanoPi R2S (NanoPi-R2S-V1.1-2009-Schematic.pdf):
  VCCIO4 (U12) = VDD_PHY_IO
  VCCIO6 (H6)  = VCC_IO_33

NanoPi R2S Plus (NanoPi_R2S_Plus_2309_SCH.PDF):
  VCCIO4 (U12) = VCC_IO_33
  VCCIO6 (H6)  = VCC_18

rk3328-nanopi-r2.dtsi describes the R2S. On the R2S Plus this leaves the
VCCIO4 domain configured for 1.8V while supplied with 3.3V, and the
VCCIO6 domain, which carries the M.2 E-key SDIO signals, configured for
3.3V while supplied with 1.8V; the latter prevents the optional RTL8822CS
Wi-Fi module from initialising at all.

Describe the actual supplies. The vendor's own kernel uses the same
values [1], although there they come from a .dtsi shared by the whole
NanoPi R2 family, so the schematics above are the reference. Tested on
an R2S Plus: Ethernet still links at 1Gbps and the SDIO Wi-Fi module
enumerates.

[1] https://github.com/friendlyarm/kernel-rockchip/blob/9238df9d21e835bba35c8ba5248784387936cb2e/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2-common.dtsi#L425-L435
Fixes: b8c028782922 ("arm64: dts: rockchip: Add DTS for FriendlyARM NanoPi R2S Plus")
Signed-off-by: Deomid rojer Ryabkov <rojer at rojer.me>
---
 arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s-plus.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s-plus.dts b/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s-plus.dts
index 4eff0503928..6ba4a74cb1f 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s-plus.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s-plus.dts
@@ -29,3 +29,8 @@ &emmc {
 	pinctrl-0 = <&emmc_clk &emmc_cmd &emmc_bus8>;
 	status = "okay";
 };
+
+&io_domains {
+	vccio4-supply = <&vcc_io_33>;
+	vccio6-supply = <&vcc_18>;
+};
-- 
2.53.0