[openwrt/openwrt] ramips: speed up spi frequency for Youku YK-L1

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/92489b4f828e21cffae977ea77daefec73753e5c

commit 92489b4f828e21cffae977ea77daefec73753e5c
Author: Shiji Yang <yangshiji66 at qq.com>
AuthorDate: Sun Mar 21 22:43:59 2021 +0800

    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 at qq.com>
    (cherry picked from commit bf7ddb18f1bfa0b61b4dc43732c114f20900bd4b)
---
 target/linux/ramips/dts/mt7620a_youku_yk1.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/ramips/dts/mt7620a_youku_yk1.dts b/target/linux/ramips/dts/mt7620a_youku_yk1.dts
index d44c9a0dad..721b51db75 100644
--- a/target/linux/ramips/dts/mt7620a_youku_yk1.dts
+++ b/target/linux/ramips/dts/mt7620a_youku_yk1.dts
@@ -70,7 +70,7 @@
 	flash at 0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <25000000>;
+		spi-max-frequency = <80000000>;
 		m25p,fast-read;
 
 		partitions {