linux-kernel - [PATCH v4 11/19] arm64: dts: mediatek: mt8192-asurada: Fix voltage constraint for Vgpu

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Message-Id: <20230301095523.428461-12-angelogioacchino.delregno@collabora.com>
Date:   Wed,  1 Mar 2023 10:55:15 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        angelogioacchino.delregno@...labora.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: [PATCH v4 11/19] arm64: dts: mediatek: mt8192-asurada: Fix voltage constraint for Vgpu

The MT8192 SoC specifies a maximum voltage for the GPU's digital supply
of 0.88V and the GPU OPPs are declaring a maximum voltage of 0.80V.

In order to keep the GPU voltage in the safe range, change the maximum
voltage for mt6315@7's vbuck1 to 0.80V as sending, for any mistake,
1.193V would be catastrophic.

Fixes: 3183cb62b033 ("arm64: dts: mediatek: asurada: Add SPMI regulators")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
index df477eb89f21..8570b78c04a4 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
@@ -1408,7 +1408,7 @@ mt6315_7_vbuck1: vbuck1 {
 				regulator-compatible = "vbuck1";
 				regulator-name = "Vgpu";
 				regulator-min-microvolt = <606250>;
-				regulator-max-microvolt = <1193750>;
+				regulator-max-microvolt = <800000>;
 				regulator-enable-ramp-delay = <256>;
 				regulator-allowed-modes = <0 1 2>;
 			};
-- 
2.39.2