On Wed, May 16, 2018 at 03:37:03PM +0200, Stefan Wahren wrote:
> 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 <[email protected]>
> ---
> .../devicetree/bindings/hwmon/raspberrypi-hwmon.txt | 19
> +++++++++++++++++++
> 1 file changed, 19 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/hwmon/raspberrypi-hwmon.txt
>
> diff --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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