[PATCH 2/3] arm64: dts: rockchip: add the SPI NOR flash supply on Orange Pi 5

[Arun Iyengar via B4 Relay <devnull+aiyengar1990.gmail.com@kernel.org>]

From: Arun Iyengar <aiyengar1990@gmail.com>

The SPI NOR flash on the Orange Pi 5 has no vcc-supply, so spi-nor
falls back to a dummy regulator:

  spi-nor spi5.0: supply vcc not found, using dummy regulator

The flash reports JEDEC ID 20 41 18, an XMC XM25QU128C, which is a
1.8 V part, and it is wired to FSPI M0, whose pins (GPIO2_A0,
GPIO2_D0-D6) are in the 1.8 V eMMC I/O domain. That domain and the
serial flash are fed from VCC_1V8_S3 (RK806 BUCK10), as in Rockchip's
RK3588 reference design; it is also the rail other RK3588 boards with a
1.8 V flash use (e.g. NanoPC-T6).

Describe the supply. The rail is always-on, so nothing changes
functionally; the flash just gets its real supply instead of a dummy
one. Only the Orange Pi 5 enables the flash: on the 5B and 5 Pro the
FSPI M0 pins are used by the eMMC.

Signed-off-by: Arun Iyengar <aiyengar1990@gmail.com>
---
 arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dts b/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dts
index d76bdf1b5e90..d67c876c8013 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dts
@@ -33,4 +33,8 @@ &pcie2x1l2 {
 
 &sfc {
 	status = "okay";
+
+	flash@0 {
+		vcc-supply = <&vcc_1v8_s3>;
+	};
 };

-- 
2.55.0