From: Frieder Schrempf <frieder.schrempf@kontron.de>

There is an onboard level shifter for the SPI signals that causes
additional propagation delay and renders the SPI transmission
unreliable at 20 MHz. Reduce the clock frequency to a safe value.

Fixes: 946ab10e3f40 ("arm64: dts: Add support for Kontron OSM-S i.MX8MP SoM and BL carrier board")
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
 arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts b/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts
index 0924ac50fd2d..75ae46642782 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-kontron-bl-osm-s.dts
@@ -63,7 +63,7 @@ &ecspi2 {
 	eeram@0 {
 		compatible = "microchip,48l640";
 		reg = <0>;
-		spi-max-frequency = <20000000>;
+		spi-max-frequency = <16000000>;
 	};
 };
 
-- 
2.54.0

From: Frank Li <Frank.Li@nxp.com>


On Wed, 13 May 2026 15:25:31 +0200, Frieder Schrempf wrote:
> There is an onboard level shifter for the SPI signals that causes
> additional propagation delay and renders the SPI transmission
> unreliable at 20 MHz. Reduce the clock frequency to a safe value.

Applied, thanks!

[1/1] arm64: dts: imx8mp-kontron: Reduce EERAM SPI clock frequency
      commit: 8c0910ba1adb5ee729b6331090ab1a45a6782205

Best regards,
-- 
Frank Li <Frank.Li@nxp.com>