linux-kernel - [PATCH] arm64: dts: rockchip: Always enable sd regulator on SOQuartz CM4IO

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Date:   Wed, 15 Feb 2023 02:09:14 +0100
From:   Nicolas Frattaroli <frattaroli.nicolas@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        Peter Geis <pgwipeout@...il.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: Always enable sd regulator on SOQuartz CM4IO

The 3.3V line coming from the SDMMC regulator is required for USB
on the CM4IO board. Without it, the USB mux (U13 in the CM4IO
schematic[1]) that's used likely remains unpowered, and no USB
devices show up.

The consequence of this was the behaviour of an inserted SD card
allowing USB to work, while pulling it out turned off all USB
devices.

[1]: https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf

Fixes: 5859b5a9c3ac ("arm64: dts: rockchip: add SoQuartz CM4IO dts")
Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@...il.com>
---
 arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts b/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts
index 263ce40770dd..88a61fa8a95c 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-soquartz-cm4.dts
@@ -135,6 +135,12 @@ &sdmmc0 {
 };
 
 &sdmmc_pwr {
+	/*
+	 * USB also needs this regulator to work on this board, so just enable
+	 * it unconditionally.
+	 */
+	regulator-always-on;
+	regulator-boot-on;
 	regulator-min-microvolt = <3300000>;
 	regulator-max-microvolt = <3300000>;
 	status = "okay";
-- 
2.39.1