[openwrt/openwrt] ath79: mikrotik: fix reference clock of Routerboard 911G

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/40fc6bd5cc679875e38ea1769527affdb5be12ba

commit 40fc6bd5cc679875e38ea1769527affdb5be12ba
Author: Lech Perczak <lech.perczak at gmail.com>
AuthorDate: Wed Feb 12 02:25:53 2025 +0100

    ath79: mikrotik: fix reference clock of Routerboard 911G
    
    When support for Routerboard 911G was introduced, Routerboad 912UAG
    device tree was used as a base, and the common part. This led to use of
    40MHz as the reference clock frequency for both [1], while RB911G uses 25MHz
    crystal on the board, causing heavy system clock drift.
    
    Split the definition, and set the reference clock frequency for RB911G
    back to 25MHz.
    
    [1] a716ac556497 ("ath79: fix reference clock for RouterBoard 912UAG")
    
    Fixes: bcc44b1212b2 ("ath79: support for MikroTik RouterBOARD 911G-(2,5)HPnD")
    Signed-off-by: Lech Perczak <lech.perczak at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/17944
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g-xhpnd.dts   | 4 ++++
 target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g.dtsi        | 4 ----
 target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts | 4 ++++
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g-xhpnd.dts b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g-xhpnd.dts
index 5fa44b4412..655c590f8c 100644
--- a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g-xhpnd.dts
+++ b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g-xhpnd.dts
@@ -9,3 +9,7 @@
 	compatible = "mikrotik,routerboard-911g-xhpnd", "qca,ar9342";
 	model = "MikroTik RouterBOARD 911G-(2,5)HPnD";
 };
+
+&ref {
+	clock-frequency = <25000000>;
+};
diff --git a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g.dtsi b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g.dtsi
index 0c98a6634e..3a8c60456f 100644
--- a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g.dtsi
+++ b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-911g.dtsi
@@ -146,10 +146,6 @@
 	};
 };
 
-&ref {
-	clock-frequency = <40000000>;
-};
-
 &spi {
 	status = "okay";
 
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 81d7284b3d..4cf62349f5 100644
--- a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
+++ b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
@@ -10,6 +10,10 @@
 	model = "MikroTik RouterBOARD 912UAG-(2,5)HPnD";
 };
 
+&ref {
+	clock-frequency = <40000000>;
+};
+
 &pcie {
 	status = "okay";
 };