linux-kernel - [PATCH] arm64: dts: mediatek: mt8186-evb: Add vproc fixed regulator

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Message-ID: <20260115113608.64817-1-angelogioacchino.delregno@collabora.com>
Date: Thu, 15 Jan 2026 12:36:08 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: linux-mediatek@...ts.infradead.org
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kernel@...labora.com
Subject: [PATCH] arm64: dts: mediatek: mt8186-evb: Add vproc fixed regulator

This board at the moment has no support for PMIC regulators, but
the CCI requires a vproc regulator in order to both stop giving
dtbs_check warnings and to actually probe.

Since vproc is a system-critical regulator and the bootloader
enables it at max voltage, model it (at least temporarily) as
a regulator-fixed and assign it to CCI.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt8186-evb.dts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186-evb.dts b/arch/arm64/boot/dts/mediatek/mt8186-evb.dts
index 2667a7424200..a941a931a07c 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-evb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8186-evb.dts
@@ -22,6 +22,19 @@ memory@...00000 {
 		device_type = "memory";
 		reg = <0 0x40000000 0 0x80000000>;
 	};
+
+	vproc: regulator-vproc12 {
+		compatible = "regulator-fixed";
+		regulator-name = "vproc12";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+	};
+};
+
+&cci {
+	proc-supply = <&vproc>;
 };
 
 &i2c0 {
-- 
2.52.0