From: Pavel Kamaev <pavel@kamaev.me>
Date: Sun, 16 Oct 2022 18:27:47 +0000 (+0300)
Subject: ath79: fix reference clock for RouterBoard 912UAG
X-Git-Tag: v22.03.3~203
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=7a3d5959afe8176d40b5e29feff227bfacfd6f80;p=openwrt%2Fstaging%2Fhauke.git

ath79: fix reference clock for RouterBoard 912UAG

This fixes reference clock frequency of RB912. 25 MHz frequency leads
to system clock running too fast, uptime incrementing too fast and
delays (like `sleep 10`) returning too early.

Board has quartz with NSK 3KHAA Z 40 000 marking.

Signed-off-by: Pavel Kamaev <pavel@kamaev.me>
(cherry picked from commit a716ac55649707e8279de6f2ea66c7f6060c982c)
---

diff --git a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
index b7ab1cacdb..809f090aca 100644
--- a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
+++ b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
@@ -147,7 +147,7 @@
 };
 
 &ref {
-	clock-frequency = <25000000>;
+	clock-frequency = <40000000>;
 };
 
 &spi {