ramips: speed up spi frequency for Youku YK-L1

Youku YK-L1 has a huge storage space up to 32 MB. It is better to
use a higher spi clock to read or write serial nor flash chips.
Youku YK-L1 has Winbond w25q256fvfg on board that can support
104 MHz spi clock so 48 MHz is safe enough.
The real frequency can only be sysclk(580MHz ) /3 /(2^n) so 80 MHz
defined in dts file will set only 48 MHz in spi bus.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
(cherry picked from commit bf7ddb18f1bfa0b61b4dc43732c114f20900bd4b)

diff --git a/target/linux/ramips/dts/mt7620a_youku_yk1.dts b/target/linux/ramips/dts/mt7620a_youku_yk1.dts
index d44c9a0dadc6ebec3ba02a12d8a0d63a4690e7d8..721b51db7522f7ac583af1f5a17183d74a31932b 100644 (file)
--- a/target/linux/ramips/dts/mt7620a_youku_yk1.dts
+++ b/target/linux/ramips/dts/mt7620a_youku_yk1.dts
@@ -70,7 +70,7 @@
        flash@0 {
                compatible = "jedec,spi-nor";
                reg = <0>;
-               spi-max-frequency = <25000000>;
+               spi-max-frequency = <80000000>;
                m25p,fast-read;
 
                partitions {