arm64: dts: imx8mp-kontron: Reduce EERAM SPI clock frequency

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>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

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 0924ac50fd2dbccaa547f4e8850b848a6391c594..75ae4664278214a826ff7b57dd0b956cf76fcbb6 100644 (file)
--- 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 @@
        eeram@0 {
                compatible = "microchip,48l640";
                reg = <0>;
-               spi-max-frequency = <20000000>;
+               spi-max-frequency = <16000000>;
        };
 };