linux-kernel - [PATCH 8/8] arm64: dts: imx8mm-kontron: Leave reg_vdd

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Date:   Thu, 30 Sep 2021 17:56:31 +0200
From:   Frieder Schrempf <frieder@...s.de>
To:     devicetree@...r.kernel.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     Heiko Thiery <heiko.thiery@...il.com>, stable@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: [PATCH 8/8] arm64: dts: imx8mm-kontron: Leave reg_vdd_arm always powered on

From: Frieder Schrempf <frieder.schrempf@...tron.de>

When the cpufreq driver is enabled, the buck2 regulator is kept powered on
by the dependency between the CPU nodes with 'cpu-supply' set. Without the
cpufreq driver the kernel will power off the regulator as it doesn't see
any users. This is obviously not what we want, therefore keep the regulator
powered on in any case.

Reported-by: Heiko Thiery <heiko.thiery@...il.com>
Fixes: 21c4f45b335f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
Cc: stable@...r.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
 arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
index 213014f59b46..c3418d263eb4 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
@@ -105,6 +105,7 @@ reg_vdd_arm: BUCK2 {
 				regulator-min-microvolt = <850000>;
 				regulator-max-microvolt = <950000>;
 				regulator-boot-on;
+				regulator-always-on;
 				regulator-ramp-delay = <3125>;
 				nxp,dvs-run-voltage = <950000>;
 				nxp,dvs-standby-voltage = <850000>;
-- 
2.33.0