[PATCH v2 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 on the flash node in rk3588s-orangepi-5.dtsi, where
the node and the regulator are defined. 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 and the controller
stays disabled.

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

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dtsi b/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dtsi
index 2db6ee95e504..c7d892e4f961 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dtsi
@@ -302,6 +302,7 @@ flash@0 {
 		spi-max-frequency = <100000000>;
 		spi-rx-bus-width = <4>;
 		spi-tx-bus-width = <1>;
+		vcc-supply = <&vcc_1v8_s3>;
 	};
 };
 

-- 
2.55.0