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ramips: increase SPI frequency for MT7620 Archer

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Increase the SPI frequency for the MT7620 based TP-Link Archer
series to 30MHz.

TP-Link uses different SPI flash chips for the same board
revision, so be conservative to not break boards with a
different chip. 30MHz should be well supported by all chips.

Tested on Archer C2 v1 (GD25Q64B) and Archer C20i (W25Q64FV).

Archer C20i (before)
====================
root@OpenWrt:~# time dd if=/dev/mtd1 of=/tmp/test.bin bs=64k
122+0 records in
122+0 records out
real	0m 15.30s
user	0m 0.00s
sys	0m 15.29s

Archer C20i (after)
===================
root@OpenWrt:~# time dd if=/dev/mtd1 of=/tmp/test.bin bs=64k
122+0 records in
122+0 records out
real	0m 5.99s
user	0m 0.00s
sys	0m 5.98s

Signed-off-by: David Bauer <mail@david-bauer.net>
Acked-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
This commit is contained in:
David Bauer 2020-07-21 20:11:28 +02:00 committed by CN_SZTL
parent 1c9cd3b359
commit 903f30b801
No known key found for this signature in database
GPG Key ID: 6850B6345C862176
3 changed files with 3 additions and 3 deletions
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2
target/linux/ramips/dts/mt7620a_tplink_archer-c2-v1.dts
View File

@ -82,7 +82,7 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <10000000>;
spi-max-frequency = <30000000>;
partitions {
compatible = "fixed-partitions";

2
target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts
View File

@ -121,7 +121,7 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <10000000>;
spi-max-frequency = <30000000>;
partitions {
compatible = "fixed-partitions";

2
target/linux/ramips/dts/mt7620a_tplink_archer.dtsi
View File

@ -43,7 +43,7 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <10000000>;
spi-max-frequency = <30000000>;
partitions {
compatible = "fixed-partitions";