From: Markus Fritsche <mfritsche@reauktion.de>
Subject: [PATCH] arm64: dts: rockchip: rk3399-pinebook-pro: cap spi1 to 10 MHz

The on-board SPI flash on the Pinebook Pro is reachable via spi1; setting
spi-max-frequency below the controller's nominal max keeps the bus stable
across the variants of NOR flash shipped with the laptop. 10 MHz is the
community-validated upper bound that all observed parts handle without
read-back errors during routine boot probes.

scope: board/pinebook-pro
fleet: fresnel

Signed-off-by: Markus Fritsche <mfritsche@reauktion.de>
---
 arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
@@ -947,6 +1029,7 @@
 };

 &spi1 {
+	max-freq = <10000000>;
 	status = "okay";

 	spiflash: flash@0 {