This commit increases the SPI bus frequency from 20 to 52 MHz. Reduces boot
time by 2s. Below is a performance comparison.
spi-max-frequency = <20000000>
> time dd if=/dev/mtd4 of=/dev/null bs=10M count=1
> 1+0 records in
> 1+0 records out
> real 0m 1.86s
> user 0m 0.00s
> sys 0m 0.28s
spi-max-frequency = <52000000>
> time dd if=/dev/mtd4 of=/dev/null bs=10M count=1
> 1+0 records in
> 1+0 records out
> real 0m 1.04s
> user 0m 0.00s
> sys 0m 0.27s
Signed-off-by: st7105 <st7105@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21802
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
e94d4f2022