arm64: dts: freescale: imx8mp-verdin: replace sleep-moci hog with regulator

The Verdin family has a signal called sleep-moci which can be used to
turn off peripherals on the carrier board when the SoM goes into
suspend. So far we have hogged this signal, which means the peripherals
are always on and it is not possible to add peripherals that depend on
the sleep-moci to be on. With this change, we replace the hog with a
regulator so that peripherals can add their own regulators that use the
same gpio. Carrier boards that allow peripherals to be powered off in
suspend can disable this regulator and implement their own regulator to
control the sleep-moci.

Upstream-Status: Backport [9d071e1889a578162ced6a6c9062653f9bcb442c]
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>

5 files changed, 36 insertions, 10 deletions

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin-dahlia.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin-dahlia.dtsi
index 8d8fded2c637..0b635481d68b 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin-dahlia.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin-dahlia.dtsi
@@ -70,6 +70,11 @@
 	status = "okay";
 };
 
+&gpio4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ctrl_sleep_moci>;
+};
+
 /* Current measurement into module VCC */
 &hwmon {
 	status = "okay";
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin-dev.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin-dev.dtsi
index c5991054749f..18c600805e96 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin-dev.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin-dev.dtsi
@@ -93,6 +93,11 @@
 	status = "okay";
 };
 
+&gpio4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ctrl_sleep_moci>;
+};
+
 &gpio_expander_21 {
 	status = "okay";
 	vcc-supply = <&reg_1p8v>;
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin-mallow.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin-mallow.dtsi
index 8482393f3cac..3477eb583f6f 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin-mallow.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin-mallow.dtsi
@@ -91,6 +91,11 @@
 	status = "okay";
 };
 
+&gpio4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ctrl_sleep_moci>;
+};
+
 /* Temperature sensor on Mallow */
 &hwmon_temp {
 	compatible = "ti,tmp1075";
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin-yavia.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin-yavia.dtsi
index bd7b31cc3760..a863f117c4c5 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin-yavia.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin-yavia.dtsi
@@ -100,6 +100,11 @@
 	status = "okay";
 };
 
+&gpio4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ctrl_sleep_moci>;
+};
+
 &hwmon_temp {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
index 9d6298748c4d..f8f428233f4a 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
@@ -148,6 +148,22 @@
 		vin-supply = <&reg_vdd_3v3>;
 	};
 
+	/*
+	 * By default we enable CTRL_SLEEP_MOCI#, this is required to have
+	 * peripherals on the carrier board powered.
+	 * If more granularity or power saving is required this can be disabled
+	 * in the carrier board device tree files.
+	 */
+	reg_force_sleep_moci: regulator-force-sleep-moci {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		/* Verdin CTRL_SLEEP_MOCI# (SODIMM 256) */
+		gpio = <&gpio4 29 GPIO_ACTIVE_HIGH>;
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-name = "CTRL_SLEEP_MOCI#";
+	};
+
 	reg_usb1_vbus: regulator-usb1-vbus {
 		compatible = "regulator-fixed";
 		enable-active-high;
@@ -489,16 +505,6 @@
 			  "SODIMM_256",
 			  "SODIMM_48",
 			  "SODIMM_44";
-
-	ctrl-sleep-moci-hog {
-		gpio-hog;
-		/* Verdin CTRL_SLEEP_MOCI# (SODIMM 256) */
-		gpios = <29 GPIO_ACTIVE_HIGH>;
-		line-name = "CTRL_SLEEP_MOCI#";
-		output-high;
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_ctrl_sleep_moci>;
-	};
 };
 
 /* On-module I2C */