linux-kernel - [PATCH] arm64: dts: rockchip: set vdd_gpu regulator on rk3568-evb1-v10 to always on

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Date:   Wed, 23 Feb 2022 12:20:08 +0100
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Liang Chen <cl@...k-chips.com>
Subject: [PATCH] arm64: dts: rockchip: set vdd_gpu regulator on rk3568-evb1-v10 to always on

As discussed in [0], the Rockchip power domain driver does not consider
the external supplies (such as VDD_GPU on the RK3568 EVB1). In the scope of
this discussion it has been pointed out that turning this voltage on/off
on the fly is not explicitly supported. This patch follows the other RK356x
boards by example and sets the vdd_gpu regulator to always on.

[0] https://lore.kernel.org/linux-rockchip/20211217130919.3035788-1-s.hauer@pengutronix.de/

Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>
---
 arch/arm64/boot/dts/rockchip/rk3568-evb1-v10.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3568-evb1-v10.dts b/arch/arm64/boot/dts/rockchip/rk3568-evb1-v10.dts
index f3d0bc259166..bb7177ff92ac 100644
--- a/arch/arm64/boot/dts/rockchip/rk3568-evb1-v10.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3568-evb1-v10.dts
@@ -219,6 +219,7 @@ regulator-state-mem {
 
 			vdd_gpu: DCDC_REG2 {
 				regulator-name = "vdd_gpu";
+				regulator-always-on;
 				regulator-init-microvolt = <900000>;
 				regulator-initial-mode = <0x2>;
 				regulator-min-microvolt = <500000>;
-- 
2.30.2