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Date:   Sun, 24 Mar 2019 14:02:56 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCH v1] ARM: dts: exynos: Add proper regulator states for suspend-to-mem for odroid-u3

Add suspend-to-mem node to regulator core to be enabled or disabled
during system suspend and also support changing the regulator operating
mode during runtime and when the system enter sleep mode (stand by mode).

Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
Current patch:

Note: Both microSD and eMMC suspend resume works this changes at my end.

regulator-off-in-suspend:
set the regulator node into suspend state i.e. standby mode during suspend
operation.

Current changes are based on
[0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt

  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').

drop the suspend off binding which are not supported by the driver.

RFC version
[1] https://patchwork.kernel.org/patch/10810909/
These changes had some problem with eMMC not entering into suspend mode.
with some miss configuration in regulator-off-in-suspend mode.

Changes from previos patch.
[2] https://patchwork.kernel.org/patch/10712549/

Set all the non used regulator in suspend-odd state
LD02, LD03, LD05, LD06, LD07, LD011, LD013, LDO14, LD016

BUCK5, BUCK6, BUCK7 and not confirable as per driver max77686-regulator
---
 .../boot/dts/exynos4412-odroid-common.dtsi    | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index 08d3a0a7b4eb..375156ad5454 100644
--- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
+++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
@@ -288,6 +288,9 @@
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
 				regulator-always-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo3_reg: LDO3 {
@@ -317,6 +320,9 @@
 				regulator-min-microvolt = <1000000>;
 				regulator-max-microvolt = <1000000>;
 				regulator-always-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo7_reg: LDO7 {
@@ -324,18 +330,27 @@
 				regulator-min-microvolt = <1000000>;
 				regulator-max-microvolt = <1000000>;
 				regulator-always-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo8_reg: LDO8 {
 				regulator-name = "VDD10_HDMI_1.0V";
 				regulator-min-microvolt = <1000000>;
 				regulator-max-microvolt = <1000000>;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo10_reg: LDO10 {
 				regulator-name = "VDDQ_MIPIHSI_1.8V";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo11_reg: LDO11 {
@@ -343,6 +358,9 @@
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
 				regulator-always-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo12_reg: LDO12 {
@@ -351,6 +369,9 @@
 				regulator-max-microvolt = <3300000>;
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo13_reg: LDO13 {
@@ -367,6 +388,9 @@
 				regulator-max-microvolt = <1800000>;
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo15_reg: LDO15 {
@@ -375,6 +399,9 @@
 				regulator-max-microvolt = <1000000>;
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo16_reg: LDO16 {
@@ -383,6 +410,9 @@
 				regulator-max-microvolt = <1800000>;
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			ldo20_reg: LDO20 {
@@ -421,6 +451,9 @@
 				regulator-max-microvolt = <1100000>;
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			buck2_reg: BUCK2 {
@@ -437,6 +470,9 @@
 				regulator-max-microvolt = <1050000>;
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			buck4_reg: BUCK4 {
@@ -444,6 +480,9 @@
 				regulator-min-microvolt = <900000>;
 				regulator-max-microvolt = <1100000>;
 				regulator-microvolt-offset = <50000>;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
 			};
 
 			buck5_reg: BUCK5 {
-- 
2.21.0

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