[PATCH 3/3] arm64: dts: mediatek: mt8186-corsola-voltorb: Add MT6319 ramp-delay

[Chen-Yu Tsai <wenst@chromium.org>]

On Voltorb and Squirtle, the MT6319 buck1 regulator supplying the big
CPU cluster is missing the regulator-ramp-delay property. Without the
slew rate specified, voltage increases may not have settled before
switching the big CPU cluster to higher operating points, risking
undervoltage crashes.

Firmware configures the MT6319 slew rate on these designs to 6250 uV/us,
with the value provided by MediaTek. Add regulator-ramp-delay = <6250>
to mt6319_buck1.

Fixes: 321ad586e607 ("arm64: dts: mediatek: Add MT8186 Voltorb Chromebooks")
Cc: <stable@vger.kernel.org>
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
---
Patch created with LLM. Values were translated from raw register values
by MediaTek.
---
 arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi
index 0250b4eeadd4..2ec343f49da3 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi
@@ -84,6 +84,7 @@ mt6319_buck1: vbuck1 {
 					regulator-min-microvolt = <600000>;
 					regulator-max-microvolt = <1193750>;
 					regulator-enable-ramp-delay = <256>;
+					regulator-ramp-delay = <6250>;
 					regulator-allowed-modes = <0 1 2>;
 					regulator-always-on;
 			};
-- 
2.56.0.317.g454f8302e1-goog