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This commit increases the SPI bus frequency from 20 to 52 MHz. Reduces boot time by 2s. Below is a performance comparison. Before: root@OpenWrt:~# dd if=/dev/mtd5 of=/dev/null bs=10M count=1 status=progress 10485760 bytes (10 MB, 10 MiB) copied, 2 s, 5.8 MB/ After: root@OpenWrt:~# dd if=/dev/mtd5 of=/dev/null bs=10M count=1 status=progress 10485760 bytes (10 MB, 10 MiB) copied, 1 s, 9.7 MB/s Taken from PR #18752 as each device should be tested individually, so I have created a separate PR for this. Signed-off-by: Sky Huang <SkyLake.Huang@mediatek.com> Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl> Link: https://github.com/openwrt/openwrt/pull/19439 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>