[PATCH] arm64: dts: rockchip: Increase maximum frequency of SPI flash for ROCK Pi 4A/B/C

[Stefan Nagy]

The ROCK Pi 4A/B/C boards come with a 32 Mbit SPI NOR flash chip (XTX Technology Limited XT25F32) which has a maximum clock frequency of 108 MHz. However, the Rockchip SPI controller driver limits the maximum SPI clock frequency to 50 MHz. Use this limit for spi-max-freq.

This patch has been tested on ROCK Pi 4A.

Signed-off-by: Stefan Nagy <stefan.nagy at ixypsilon.net>
---
 arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts | 2 +-
 arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts | 2 +-
 arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
index d5df8939a..30e63e62a 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
@@ -19,6 +19,6 @@ &spi1 {
 	flash at 0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <50000000>;
 	};
 };
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
index bee6d7588..7122bf6c0 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
@@ -37,7 +37,7 @@ &spi1 {
 	flash at 0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <50000000>;
 	};
 };
 
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
index de2ebe4cb..8af75bc7c 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
@@ -49,7 +49,7 @@ &spi1 {
 	flash at 0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <50000000>;
 	};
 };
 
-- 
2.30.2