[openwrt/openwrt] mt7622: remove 300 MHz from dts

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/d0d6b8e1833c587d0c50cac4f6324aa93b0bc8fc

commit d0d6b8e1833c587d0c50cac4f6324aa93b0bc8fc
Author: John Audia <therealgraysky at proton.me>
AuthorDate: Wed Jul 6 11:49:50 2022 -0400

    mt7622: remove 300 MHz from dts
    
    Due to the bug described here[1], remove the 300 MHz clock to avoid a low
    voltage condition that can cause a hang when rebooting the RT3200/E8450.
    
    This solution is probably better than the script-based work-around[2].
    
    1. https://forum.openwrt.org/t/belkin-rt3200-linksys-e8450-wifi-ax-discussion/94302/1490
    2. https://github.com/openwrt/openwrt/pull/5025
    
    Signed-off-by: John Audia <therealgraysky at proton.me>
    Tested-by: Rui Salvaterra <rsalvaterra at gmail.com>
    Tested-by: John Audia <therealgraysky at proton.me>
---
 .../722-remove-300Hz-to-prevent-freeze.patch       | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/target/linux/mediatek/patches-5.15/722-remove-300Hz-to-prevent-freeze.patch b/target/linux/mediatek/patches-5.15/722-remove-300Hz-to-prevent-freeze.patch
new file mode 100644
index 0000000000..52069496ca
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/722-remove-300Hz-to-prevent-freeze.patch
@@ -0,0 +1,25 @@
+--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
++++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
+@@ -23,11 +23,17 @@
+ 	cpu_opp_table: opp-table {
+ 		compatible = "operating-points-v2";
+ 		opp-shared;
+-		opp-300000000 {
+-			opp-hz = /bits/ 64 <300000000>;
+-			opp-microvolt = <950000>;
+-		};
+-
++		/* Due to the bug described at the link below, remove the 300 MHz clock to avoid a low
++		 * voltage condition that can cause a hang when rebooting the RT3200/E8450.
++		 *
++		 * https://forum.openwrt.org/t/belkin-rt3200-linksys-e8450-wifi-ax-discussion/94302/1490
++		 *
++		 * opp-300000000 {
++		 *	opp-hz = /bits/ 64 <300000000>;
++		 *	opp-microvolt = <950000>;
++		 * };
++		 *
++		 */
+ 		opp-437500000 {
+ 			opp-hz = /bits/ 64 <437500000>;
+ 			opp-microvolt = <1000000>;