linux-kernel - [PATCH v1 06/10] ARM: dts: exynos: Update proper regulator states for suspend-to-mem for Exynos4412 p4node

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Message-ID: <20250425132727.5160-7-linux.amoon@gmail.com>
Date: Fri, 25 Apr 2025 18:56:26 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Chanwoo Choi <cw00.choi@...sung.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	linux-kernel@...r.kernel.org (open list:MAXIM PMIC AND MUIC DRIVERS FOR EXYNOS BASED BO...),
	linux-clk@...r.kernel.org (open list:COMMON CLK FRAMEWORK),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES),
	linux-samsung-soc@...r.kernel.org (open list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES)
Cc: Anand Moon <linux.amoon@...il.com>
Subject: [PATCH v1 06/10] ARM: dts: exynos: Update proper regulator states for suspend-to-mem for Exynos4412 p4node

The MAX77686 PMCI is able to power down and up key core supplies and other
voltage rails via PWRREQ signal to enter / exit (deep) sleep mode.
PWRREQ status is ignored during initial power up and down processes.
All programming must be done before the AP enterns the sleep mode by
pulling PWRREQ low since the AP does not have programming capability
in (deep) sleep mode.

Update few regulator node with support suspend-to-mem node to regulator.
dropped suspend-to-mem as MAX77686 do not support these.

Regulators which can be turned off during system suspend:
     -LDOn   :       2, 6-8, 10-12, 14-16,
     -BUCKn  :       1-4.
Use standard regulator bindings for it ('regulator-off-in-suspend').

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
 .../boot/dts/samsung/exynos4412-p4note.dtsi   | 24 +++++++++----------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi b/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi
index ad0abe8d9e30..d0ecb1c6a922 100644
--- a/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi
@@ -448,6 +448,10 @@ ldo1_reg: LDO1 {
 			ldo2_reg: LDO2 {
 				regulator-name = "ldo2";
 				regulator-always-on;
+
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			/* WM8994 audio */
@@ -457,10 +461,6 @@ ldo3_reg: LDO3 {
 				regulator-max-microvolt = <1800000>;
 				regulator-always-on;
 				regulator-boot-on;
-
-				regulator-state-mem {
-					regulator-on-in-suspend;
-				};
 			};
 
 			ldo4_reg: LDO4 {
@@ -472,20 +472,24 @@ ldo5_reg: LDO5 {
 				regulator-name = "VCC_1.8V_IO";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
-
-				regulator-state-mem {
-					regulator-off-in-suspend;
-				};
 			};
 
 			ldo6_reg: LDO6 {
 				regulator-name = "ldo6";
 				regulator-always-on;
+
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo7_reg: LDO7 {
 				regulator-name = "ldo7";
 				regulator-always-on;
+
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			/* CSI IP block */
@@ -506,10 +510,6 @@ ldo9_reg: LDO9 {
 				regulator-name = "VLED_IC_1.9V";
 				regulator-min-microvolt = <1950000>;
 				regulator-max-microvolt = <1950000>;
-
-				regulator-state-mem {
-					regulator-off-in-suspend;
-				};
 			};
 
 			/* CSI IP block */
-- 
2.49.0