[PATCH] ARM: dts: microchip: at91-sam9x75_curiosity: Add PMIC suspend voltage configuration

[Andrei Simion <andrei.simion@microchip.com>]

Add missing essential configuration for the PMIC rails, which is necessary
for proper low-power mode operation. This patch adds the required settings
to ensure that the regulators behave correctly during Suspend-to-RAM and
Standby states. Otherwise, after resuming, it receives: "No configuration"
message.

Our driver implements the set_suspend_voltage and set_suspend_mode
callbacks, which require the `regulator-suspend-microvolt` property to be
specified in the device tree for each regulator node. This property defines
the voltage level that the regulator should maintain during suspend mode.

Additionally, according to the datasheet, some regulators need to be turned
on or off during suspend mode. This patch addresses these requirements by
adding the `regulator-on-in-suspend` and `regulator-off-in-suspend`
properties where appropriate.

Fixes: 371a47c9a58a ("ARM: dts: microchip: sam9x75_curiosity: add sam9x75 curiosity board")
Signed-off-by: Andrei Simion <andrei.simion@microchip.com>
---
 .../dts/microchip/at91-sam9x75_curiosity.dts   | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts
index 1a6a909a5043..5514ad10cda5 100644
--- a/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts
+++ b/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts
@@ -110,10 +110,12 @@ vdd_3v3: VDD_IO {
 
 				regulator-state-standby {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <3300000>;
 					regulator-mode = <4>;
 				};
 
 				regulator-state-mem {
+					regulator-off-in-suspend;
 					regulator-mode = <4>;
 				};
 			};
@@ -128,11 +130,13 @@ vddioddr: VDD_DDR {
 
 				regulator-state-standby {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <1350000>;
 					regulator-mode = <4>;
 				};
 
 				regulator-state-mem {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <1350000>;
 					regulator-mode = <4>;
 				};
 			};
@@ -147,10 +151,12 @@ vddcore: VDD_CORE {
 
 				regulator-state-standby {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <1150000>;
 					regulator-mode = <4>;
 				};
 
 				regulator-state-mem {
+					regulator-off-in-suspend;
 					regulator-mode = <4>;
 				};
 			};
@@ -166,10 +172,12 @@ dcdc4: VDD_OTHER {
 
 				regulator-state-standby {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <1150000>;
 					regulator-mode = <4>;
 				};
 
 				regulator-state-mem {
+					regulator-off-in-suspend;
 					regulator-mode = <4>;
 				};
 			};
@@ -182,6 +190,11 @@ vldo1: LDO1 {
 
 				regulator-state-standby {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <3300000>;
+				};
+
+				regulator-state-mem {
+					regulator-off-in-suspend;
 				};
 			};
 
@@ -192,6 +205,11 @@ vldo2: LDO2 {
 
 				regulator-state-standby {
 					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <1800000>;
+				};
+
+				regulator-state-mem {
+					regulator-off-in-suspend;
 				};
 			};
 		};

base-commit: 37136bf5c3a6f6b686d74f41837a6406bec6b7bc
-- 
2.34.1