Commit a953e68e authored by Nicolas Saenz Julienne's avatar Nicolas Saenz Julienne
Browse files

dt-bindings: pwm: Add binding for RPi firmware PWM bus 



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: default avatarNicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
parent 3b8ddff7

Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml

+20 −0
Original line number Diff line number Diff line
@@ -64,6 +64,21 @@ properties: 
      - compatible

      - "#reset-cells"



  pwm:

    type: object



    properties:

      compatible:

        const: raspberrypi,firmware-poe-pwm



      "#pwm-cells":

        # See pwm.yaml in this directory for a description of the cells format.

        const: 2



    required:

      - compatible

      - "#pwm-cells"



    additionalProperties: false



required:
@@ -87,5 +102,10 @@ examples: 
            compatible = "raspberrypi,firmware-reset";

            #reset-cells = <1>;

        };



        pwm: pwm {

            compatible = "raspberrypi,firmware-poe-pwm";

            #pwm-cells = <2>;

        };

    };

...

include/dt-bindings/pwm/raspberrypi,firmware-poe-pwm.h

0 → 100644
+13 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (c) 2020 Nicolas Saenz Julienne

 * Author: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

 */



#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