linux-kernel - [PATCH v2] arm64: dts: rockchip: Increase maximum frequency of SPI flash for ROCK Pi 4A/B/C

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Message-Id: <20231217113208.64056-1-stefan.nagy@ixypsilon.net>
Date: Sun, 17 Dec 2023 12:32:08 +0100
From: Stefan Nagy <stefan.nagy@...psilon.net>
To: Heiko Stuebner <heiko@...ech.de>,
	Dragan Simic <dsimic@...jaro.org>
Cc: linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] arm64: dts: rockchip: Increase maximum frequency of SPI flash for ROCK Pi 4A/B/C

The ROCK Pi 4A/B/C boards come with a 32 Mbit SPI NOR flash chip (XTX
Technology Limited XT25F32) with a maximum clock frequency of 108 MHz.
Use this value for the device node's spi-max-frequency property.

This patch has been tested on ROCK Pi 4A.

Signed-off-by: Stefan Nagy <stefan.nagy@...psilon.net>
---
Changes from v1:
- Use the maximum clock frequency the SPI chip actually supports
  instead of the SPI clock frequency limit of 50 MHz set by the
  Rockchip SPI driver.
---
 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..c68f45849 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@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <108000000>;
 	};
 };
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..6ea3180e5 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@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <108000000>;
 	};
 };
 
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..5274938bf 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@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <108000000>;
 	};
 };
 
-- 
2.30.2