arm64: dts: mediatek: mt8192-asurada: Couple VGPU and VSRAM_OTHER regulators

Add coupling for these regulators, as VSRAM_OTHER is used to power the
GPU SRAM, and they have a strict voltage output relation to satisfy in
order to ensure GPU stable operation.
While at it, also add voltage constraint overrides for the GPU SRAM
regulator "mt6359_vsram_others" so that we stay in a safe range of
0.75-0.80V.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230301095523.428461-13-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
index 8570b78..f858eca 100644 (file)
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
@@ -447,6 +447,13 @@
        regulator-always-on;
 };
 
+&mt6359_vsram_others_ldo_reg {
+       regulator-min-microvolt = <750000>;
+       regulator-max-microvolt = <800000>;
+       regulator-coupled-with = <&mt6315_7_vbuck1>;
+       regulator-coupled-max-spread = <10000>;
+};
+
 &mt6359_vufs_ldo_reg {
        regulator-always-on;
 };
@@ -1411,6 +1418,8 @@
                                regulator-max-microvolt = <800000>;
                                regulator-enable-ramp-delay = <256>;
                                regulator-allowed-modes = <0 1 2>;
+                               regulator-coupled-with = <&mt6359_vsram_others_ldo_reg>;
+                               regulator-coupled-max-spread = <10000>;
                        };
                };
        };