linux-kernel - [PATCH v4 1/2] regulator: dt-bindings: pca9450: add PMIC_RST

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Message-Id: <20240412084428.400607-2-fabio.aiuto@engicam.com>
Date: Fri, 12 Apr 2024 10:44:27 +0200
From: Fabio Aiuto <fabio.aiuto@...icam.com>
To: Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Matteo Lisi <matteo.lisi@...icam.com>,
	Mirko Ardinghi <mirko.ardinghi@...icam.com>
Subject: [PATCH v4 1/2] regulator: dt-bindings: pca9450: add PMIC_RST_B warm reset property

The default configuration of the PMIC behavior makes the PMIC
power cycle most regulators on PMIC_RST_B assertion. This power
cycling causes the memory contents of OCRAM to be lost.
Some systems needs some memory that survives reset and
reboot, therefore add a property to mark the regulator as
performing warm resets on PMIC_RST_B assertion.

Cc: Matteo Lisi <matteo.lisi@...icam.com>
Cc: Mirko Ardinghi <mirko.ardinghi@...icam.com>
Signed-off-by: Fabio Aiuto <fabio.aiuto@...icam.com>
---
 .../bindings/regulator/nxp,pca9450-regulator.yaml           | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
index 849bfa50bdba..865b259dac37 100644
--- a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
@@ -93,6 +93,12 @@ properties:
       When WDOG_B signal is asserted a warm reset will be done instead of cold
       reset.
 
+  nxp,pmic-rst-b-warm-reset:
+    type: boolean
+    description:
+      When PMIC_RST_B signal is asserted a warm reset will be done instead of cold
+      reset.
+
 required:
   - compatible
   - reg
-- 
2.34.1