From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: "Heiko Stübner" <heiko@sntech.de>,
"Maximilian Weigand" <mweigand2017@gmail.com>,
"Lee Jones" <lee@kernel.org>,
"Daniel Thompson" <daniel.thompson@linaro.org>,
"Jingoo Han" <jingoohan1@gmail.com>,
"Helge Deller" <deller@gmx.de>, "Pavel Machek" <pavel@ucw.cz>,
"Rob Herring" <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Conor Dooley" <conor+dt@kernel.org>
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org,
Maximilian Weigand <mweigand@mweigand.net>
Subject: Re: [PATCH 2/3] dt-bindings: backlight: lm3630a: add entries to control boost frequency
Date: Sat, 17 Jun 2023 19:42:29 +0200 [thread overview]
Message-ID: <c29b2b0c-2b0c-f79c-9de5-58a67edd5c87@linaro.org> (raw)
In-Reply-To: <7491264.lOV4Wx5bFT@diego>
On 17/06/2023 18:34, Heiko Stübner wrote:
> Am Samstag, 17. Juni 2023, 12:12:17 CEST schrieb Krzysztof Kozlowski:
>> On 14/06/2023 21:08, Maximilian Weigand wrote:
>>> From: Maximilian Weigand <mweigand@mweigand.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@mweigand.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.
>
> i.e.
> ti,boost-frequency-hz = <x>;
> with x being 500000, 560000, 1000000, 1120000
>
> with the driver failing when the frequency is not achievable
> with the two knobs of 1mhz and shift.
Yeah, with a default value (500000, I guess).
Best regards,
Krzysztof
next prev parent reply other threads:[~2023-06-17 17:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-14 19:08 [PATCH 0/3] backlight: lm3630a: add functionality to change boost converter frequency Maximilian Weigand
2023-06-14 19:08 ` [PATCH 1/3] backlight: lm3630a: add support for changing the boost frequency Maximilian Weigand
2023-06-26 14:39 ` Daniel Thompson
2023-06-14 19:08 ` [PATCH 2/3] dt-bindings: backlight: lm3630a: add entries to control " Maximilian Weigand
2023-06-17 10:12 ` Krzysztof Kozlowski
2023-06-17 16:34 ` Heiko Stübner
2023-06-17 17:42 ` Krzysztof Kozlowski [this message]
2023-06-17 18:15 ` Maximilian Weigand
2023-06-14 19:08 ` [PATCH 3/3] arm64: dts: rockchip: shift boost frequency for rk3566-pinenote backlight Maximilian Weigand
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