linux-kernel - Re: [PATCH 2/3] dt-bindings: backlight: lm3630a: add entries to control boost frequency

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Date:   Sat, 17 Jun 2023 12:12:17 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Maximilian Weigand <mweigand2017@...il.com>,
        Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        Maximilian Weigand <mweigand@...igand.net>
Subject: Re: [PATCH 2/3] dt-bindings: backlight: lm3630a: add entries to
 control boost frequency

On 14/06/2023 21:08, Maximilian Weigand wrote:
> From: Maximilian Weigand <mweigand@...igand.net>
> 
> Add 'ti,boost_use_1mhz' to switch between 500 kHz and 1 MHz boost
> converter switching frequency, and add 'ti,boost_frequency_shift' to
> activate a frequency shift to 560 kHz or 1.12 MHz, respectively.
> 
> Signed-off-by: Maximilian Weigand <mweigand@...igand.net>
> ---
>  .../bindings/leds/backlight/lm3630a-backlight.yaml           | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> index 3c9b4054ed9a..ef7ea0ad2d25 100644
> --- a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> +++ b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> @@ -33,6 +33,18 @@ properties:
>      description: GPIO to use to enable/disable the backlight (HWEN pin).
>      maxItems: 1
>  
> +  ti,boost_use_1mhz:

No underscores in property names.

> +    description: |

Do not need '|' unless you need to preserve formatting.

> +      If present, change the boost converter switching frequency from the
> +      default 500 kHz to 1 MHz. Refer to data sheet for hardware requirements.
> +    type: boolean
> +
> +  ti,boost_frequency_shift:
> +    description: |
> +      If present, change boost converter switching frequency from 500 kHz to
> +      560 kHz or from 1 Mhz to 1.12 Mhz, respectively.

So just make it a property choosing the frequency, not bools, with
proper unit suffix.


Best regards,
Krzysztof