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Message-ID: <20250523131214.955970-1-martijn.de.gouw@prodrive-technologies.com>
Date: Fri, 23 May 2025 15:12:11 +0200
From: Martijn de Gouw <martijn.de.gouw@...drive-technologies.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, "Rob
Herring" <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, "Conor
Dooley" <conor+dt@...nel.org>, Robin Gong <yibin.gong@....com>
CC: Martijn de Gouw <martijn.de.gouw@...drive-technologies.com>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v2 1/2] dt-bindings: regulator: add pca9450: Add regulator-allowed-modes
Make the PWM mode on the buck controllers configurable from devicetree.
Some boards require forced PWM mode to keep the supply ripple within
acceptable limits under light load conditions.
Signed-off-by: Martijn de Gouw <martijn.de.gouw@...drive-technologies.com>
---
Changes in v2:
- Add the header to the binding patch
- Improve commit message
.../regulator/nxp,pca9450-regulator.yaml | 14 ++++++++++++++
.../regulator/nxp,pca9450-regulator.h | 18 ++++++++++++++++++
2 files changed, 32 insertions(+)
create mode 100644 include/dt-bindings/regulator/nxp,pca9450-regulator.h
diff --git a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
index 4ffe5c3faea07..c7327474c64ba 100644
--- a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
@@ -100,6 +100,15 @@ properties:
PMIC default "STANDBY" state voltage in uV. Only Buck1~3 have such
dvs(dynamic voltage scaling) property.
+ regulator-allowed-modes:
+ description: |
+ Buck regulator operating modes allowed. Valid values below.
+ Users should use the macros from dt-bindings/regulator/nxp,pca9450-regulator.h
+ 0 (PCA9450_BUCK_MODE_AUTO): Auto PFM/PWM mode
+ 1 (PCA9450_BUCK_MODE_FORCE_PWM): Forced PWM mode
+ items:
+ enum: [ 0, 1 ]
+
unevaluatedProperties: false
additionalProperties: false
@@ -143,6 +152,7 @@ allOf:
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/regulator/nxp,pca9450-regulator.h>
i2c {
#address-cells = <1>;
@@ -179,6 +189,8 @@ examples:
regulator-max-microvolt = <3400000>;
regulator-boot-on;
regulator-always-on;
+ regulator-inital-mode = <PCA9450_BUCK_MODE_FORCE_PWM>;
+ regulator-allowed-modes = <PCA9450_BUCK_MODE_FORCE_PWM>;
};
buck5: BUCK5 {
regulator-name = "BUCK5";
@@ -186,6 +198,8 @@ examples:
regulator-max-microvolt = <3400000>;
regulator-boot-on;
regulator-always-on;
+ regulator-allowed-modes = <PCA9450_BUCK_MODE_AUTO
+ PCA9450_BUCK_MODE_FORCE_PWM>;
};
buck6: BUCK6 {
regulator-name = "BUCK6";
diff --git a/include/dt-bindings/regulator/nxp,pca9450-regulator.h b/include/dt-bindings/regulator/nxp,pca9450-regulator.h
new file mode 100644
index 0000000000000..08434caef429f
--- /dev/null
+++ b/include/dt-bindings/regulator/nxp,pca9450-regulator.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Device Tree binding constants for the NXP PCA9450A/B/C PMIC regulators
+ */
+
+#ifndef _DT_BINDINGS_REGULATORS_NXP_PCA9450_H
+#define _DT_BINDINGS_REGULATORS_NXP_PCA9450_H
+
+/*
+ * Buck mode constants which may be used in devicetree properties (eg.
+ * regulator-initial-mode, regulator-allowed-modes).
+ * See the manufacturer's datasheet for more information on these modes.
+ */
+
+#define PCA9450_BUCK_MODE_AUTO 0
+#define PCA9450_BUCK_MODE_FORCE_PWM 1
+
+#endif
--
2.39.2
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