linux-kernel - Re: [PATCH 7/7] pwm: dwc: add snps,pwm-number to limit pwm count

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Message-ID: <20220718200828.GA3453680-robh@kernel.org>
Date:   Mon, 18 Jul 2022 14:08:28 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ben Dooks <ben.dooks@...ive.com>
Cc:     linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        u.kleine-koenig@...gutronix.de,
        Thierry Reding <thierry.reding@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>,
        Sudip Mukherjee <sudip.mukherjee@...ive.com>,
        William Salmon <william.salmon@...ive.com>,
        Adnan Chowdhury <adnan.chowdhury@...ive.com>
Subject: Re: [PATCH 7/7] pwm: dwc: add snps,pwm-number to limit pwm count

On Tue, Jul 12, 2022 at 11:01:13AM +0100, Ben Dooks wrote:
> Add snps,pwm-number property to indicate if the block does not have
> all 8 of the PWM blocks.
> 
> Not sure if this should be a general PWM property consider optional
> for all PWM types, so have added a specific one here (there is only
> one other controller with a property for PWM count at the moment)
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ive.com>
> ---
>  Documentation/devicetree/bindings/pwm/pwm-synposys.yaml | 5 +++++
>  drivers/pwm/pwm-dwc.c                                   | 8 ++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml b/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml
> index 38ac0da75272..15bdf764b46a 100644
> --- a/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml
> +++ b/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml
> @@ -30,11 +30,16 @@ properties:
>        - items:
>          - const: snps,pwm
>  
> +  snps,pwm-number:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    description: u32 value representing the number of PWM devices

Why do we need to know this? Are you going to have a consumer to a 
non-existent PWM? If you do need to know how many, it should be implied 
by the compatible string.

Rob