linux-kernel - [RFC PATCH 2/2] arm64: dts: imx8mm-evk: mark 32k pmic clock as always-on

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Date:   Tue, 13 Sep 2022 12:21:41 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        abelvesa@...nel.org, abel.vesa@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com
Cc:     linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>,
        linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org
Subject: [RFC PATCH 2/2] arm64: dts: imx8mm-evk: mark 32k pmic clock as always-on

This clock is critical for the system since it supplies the 32k SoC
clock. Unfortunately the imx8mm.dtsi uses a fixed clock provider for the
32k SoC clock and not this one. If it would use this clock we would add
a cycle-dependency since the pmic driver depends on the i2c driver which
depends on the clock driver. Therefore use the new "clocks-always-on"
macro to mark the clock as critical, so it is never turned off by the
kernel.

Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
 arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
index 7d6317d95b13..0e950ef61900 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
@@ -195,6 +195,7 @@ pmic@4b {
 		#clock-cells = <0>;
 		clocks = <&osc_32k 0>;
 		clock-output-names = "clk-32k-out";
+		clocks-always-on = "clk-32k-out";
 
 		regulators {
 			buck1_reg: BUCK1 {
-- 
2.30.2