linux-kernel - Re: [PATCH 1/3] dt-bindings: pwm: Add binding for RPi firmware PWM bus

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Date:   Mon, 12 Oct 2020 09:01:32 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     f.fainelli@...il.com, linux@...ck-us.net, jdelvare@...e.com,
        wahrenst@....net, Eric Anholt <eric@...olt.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-pwm@...r.kernel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        linux-hwmon@...r.kernel.org, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: pwm: Add binding for RPi firmware PWM
 bus

On Fri, Oct 09, 2020 at 05:30:28PM +0200, Nicolas Saenz Julienne wrote:
> 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@...e.de>
> ---
>  .../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.

This is wrong. #pwm-cells specifies the number of "arguments" for
phandles pointing to this node. And I would prefer this being 2 to match
the stuff described in the generic pwm binding.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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