[PATCH 1/3] dt-bindings: pwm: Add binding for RPi firmware PWM bus
From: Nicolas Saenz Julienne
Date: Fri Oct 09 2020 - 11:30:56 EST
The PWM bus controlling the fan in RPi's official PoE hat can only be
controlled by the board's co-processor.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
---
.../arm/bcm/raspberrypi,bcm2835-firmware.yaml | 21 +++++++++++++++++++
.../pwm/raspberrypi,firmware-pwm.h | 13 ++++++++++++
2 files changed, 34 insertions(+)
create mode 100644 include/dt-bindings/pwm/raspberrypi,firmware-pwm.h
diff --git a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
index a2c63c8b1d10..dcaf00e8602e 100644
--- a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
+++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml
@@ -64,6 +64,22 @@ properties:
- compatible
- "#reset-cells"
+ pwm:
+ type: object
+
+ properties:
+ compatible:
+ const: raspberrypi,firmware-pwm
+
+ "#pwm-cells":
+ const: 1
+ description: >
+ The argument is the PWM bus number.
+
+ required:
+ - compatible
+ - "#pwm-cells"
+
additionalProperties: false
required:
@@ -87,5 +103,10 @@ examples:
compatible = "raspberrypi,firmware-reset";
#reset-cells = <1>;
};
+
+ pwm: pwm {
+ compatible = "raspberrypi,firmware-pwm";
+ #pwm-cells = <1>;
+ };
};
...
diff --git a/include/dt-bindings/pwm/raspberrypi,firmware-pwm.h b/include/dt-bindings/pwm/raspberrypi,firmware-pwm.h
new file mode 100644
index 000000000000..27c5ce68847b
--- /dev/null
+++ b/include/dt-bindings/pwm/raspberrypi,firmware-pwm.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020 Nicolas Saenz Julienne
+ * Author: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
+ */
+
+#ifndef _DT_BINDINGS_RASPBERRYPI_FIRMWARE_PWM_H
+#define _DT_BINDINGS_RASPBERRYPI_FIRMWARE_PWM_H
+
+#define RASPBERRYPI_FIRMWARE_PWM_POE 0
+#define RASPBERRYPI_FIRMWARE_PWM_NUM 1
+
+#endif
--
2.28.0