linux-kernel - [PATCH] arm64: dts: rockchip: rk3399-nanopi4: Fix voltage regulator config

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Message-Id: <963AF33B-54B7-4172-92D1-E2898E256A7E@kohlschutter.com>
Date:   Sun, 17 Jul 2022 21:29:01 +0200
From:   Christian Kohlschütter 
        <christian@...lschutter.com>
To:     Robin Murphy <robin.murphy@....com>, wens@...nel.org,
        Heiko Stübner <heiko@...ech.de>,
        Markus Reichl <m.reichl@...etechno.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH] arm64: dts: rockchip: rk3399-nanopi4: Fix voltage regulator
 config

A series of issues exist around the "vcc3v0_sd" voltage regulator that
made it necessary to mark it "always-on".

With the patch "regulator: core: Resolve supply name earlier to prevent
double-init", this option is no longer necessary.

Removing this option not only prevents a hang when rebooting Nanopi R4S,
it also ensures that bootloaders like u-boot can boot from an SD card
right away, without out-of-tree patches that re-initialize voltage levels.

Signed-off-by: Christian Kohlschütter <christian@...lschutter.com>
---
 arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi
index 8c0ff6c96e03..55b93eac2f99 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi
@@ -70,7 +70,6 @@ vcc3v0_sd: vcc3v0-sd {
 		gpio = <&gpio0 RK_PA1 GPIO_ACTIVE_HIGH>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&sdmmc0_pwr_h>;
-		regulator-always-on;
 		regulator-min-microvolt = <3000000>;
 		regulator-max-microvolt = <3000000>;
 		regulator-name = "vcc3v0_sd";
-- 
2.36.1