linux-kernel - [PATCH v1 1/2] arm64: dts: ti: k3-am62-verdin: replace sleep-moci hog with regulator

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Date: Fri,  1 Mar 2024 09:49:00 +0100
From: Stefan Eichenberger <eichest@...il.com>
To: nm@...com,
	vigneshr@...com,
	kristo@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	francesco.dolcini@...adex.com,
	Stefan Eichenberger <stefan.eichenberger@...adex.com>
Subject: [PATCH v1 1/2] arm64: dts: ti: k3-am62-verdin: replace sleep-moci hog with regulator

From: Stefan Eichenberger <stefan.eichenberger@...adex.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@...adex.com>
---
 arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi | 24 ++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
index 6a06724b6d16..ba3b3e18a46d 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
@@ -122,6 +122,22 @@ reg_1v8_eth: regulator-1v8-eth {
 		vin-supply = <&reg_1v8>;
 	};
 
+	/*
+	 * 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 = <&main_gpio0 31 GPIO_ACTIVE_HIGH>;
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-name = "CTRL_SLEEP_MOCI#";
+	};
+
 	/* Verdin SD_1 Power Supply */
 	reg_sdhc1_vmmc: regulator-sdhci1 {
 		compatible = "regulator-fixed";
@@ -951,14 +967,6 @@ &main_gpio0 {
 		"",
 		"",
 		"";
-
-	verdin_ctrl_sleep_moci: ctrl-sleep-moci-hog {
-		gpio-hog;
-		/* Verdin CTRL_SLEEP_MOCI# (SODIMM 256) */
-		gpios = <31 GPIO_ACTIVE_HIGH>;
-		line-name = "CTRL_SLEEP_MOCI#";
-		output-high;
-	};
 };
 
 &main_gpio1 {
-- 
2.40.1