[PATCH RFC 2/6] dt-bindings: hwmon: Add Raspberry Pi voltage sensor
From: linux@roeck-us.net (Guenter Roeck)
Date: 2018-05-16 14:52:14
Also in:
linux-devicetree, linux-hwmon
On Wed, May 16, 2018 at 03:37:03PM +0200, Stefan Wahren wrote:
quoted hunk ↗ jump to hunk
Recent VC4 firmware provides a hardware-independent way to retrieve the under-voltage sensor on the following Raspberry Pi boards: - Raspberry Pi B+ (via GPIO on SoC) - Raspberry Pi A+ (via GPIO on SoC) - Raspberry Pi 2 B (via GPIO on SoC) - Raspberry Pi 3 B (via GPIO on port expander) - Raspberry Pi 3 B+ (via PMIC) TODO: - try to make bcm2835 firmware a bus driver Signed-off-by: Stefan Wahren <redacted> --- .../devicetree/bindings/hwmon/raspberrypi-hwmon.txt | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/raspberrypi-hwmon.txtdiff --git a/Documentation/devicetree/bindings/hwmon/raspberrypi-hwmon.txt b/Documentation/devicetree/bindings/hwmon/raspberrypi-hwmon.txt new file mode 100644 index 0000000..ec2523f --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/raspberrypi-hwmon.txt@@ -0,0 +1,19 @@ +Raspberry Pi voltage sensor +--------------------------- + +The VC4 firmware exposes a mailbox interface that allows the ARM core +to access the board's voltage sensor. + +Required properties : +- compatible : Should be "raspberrypi,bcm2835-hwmon"
'hwmon' is very Linux specific. DT bindings are supposed to be OS agnostic. Guenter
+
+Example:
+
+firmware: firmware-rpi {
+ compatible = "raspberrypi,bcm2835-firmware";
+ mboxes = <&mailbox>;
+
+ voltage-sensor {
+ compatible = "raspberrypi,bcm2835-hwmon";
+ };
+};
--
2.7.4
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