ramips: increase SPI frequency for Edimax RG21S

This increases SPI frequency from the relatively low 10 MHz to 40 MHz.

Signed-off-by: Birger Koblitz <[email protected]>
[added commit title/message, split patch]
Signed-off-by: Adrian Schmutzler <[email protected]>

target/linux/ramips/dts/mt7621_edimax_rg21s.dts

@@ -68,7 +68,7 @@
 	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <40000000>;
 
 		partitions {
 			compatible = "fixed-partitions";