patches/board/pinebook-pro: cap spi1 to 10 MHz for NOR flash stability

patches/board/pinebook-pro/0003-arm64-dts-rk3399-pinebook-pro-spi1-max-freq-10MHz.patch

@@ -0,0 +1,28 @@
+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 {