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From: Stefan Eichenberger <eichest@gmail.com>
To: robh@kernel.org,
	krzysztof.kozlowski+dt@linaro.org,
	conor+dt@kernel.org,
	shawnguo@kernel.org,
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Cc: devicetree@vger.kernel.org,
	imx@lists.linux.dev,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Stefan Eichenberger <stefan.eichenberger@toradex.com>
Subject: [PATCH v1 1/4] arm64: dts: freescale: imx8mp-verdin: replace sleep-moci hog with regulator
Date: Fri,  5 Apr 2024 18:07:17 +0200
Message-Id: <20240405160720.5977-2-eichest@gmail.com>
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From: Stefan Eichenberger <stefan.eichenberger@toradex.com>

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.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
---
 .../dts/freescale/imx8mp-verdin-dahlia.dtsi   |  5 ++++
 .../boot/dts/freescale/imx8mp-verdin-dev.dtsi |  5 ++++
 .../dts/freescale/imx8mp-verdin-yavia.dtsi    |  5 ++++
 .../boot/dts/freescale/imx8mp-verdin.dtsi     | 26 ++++++++++++-------
 4 files changed, 31 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 7e9e4b13b5c5..e68e0e6f21e9 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 @@ &flexspi {
 	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 a509b2b7fa85..1a2520d4d6cf 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 @@ &flexspi {
 	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-yavia.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin-yavia.dtsi
index db1722f0d80e..27160024d5b5 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 @@ &flexcan1 {
 	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 faa17cbbe2fd..e523762947aa 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
@@ -116,6 +116,22 @@ reg_module_eth1phy: regulator-module-eth1phy {
 		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;
@@ -439,16 +455,6 @@ &gpio4 {
 			  "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 */
-- 
2.40.1