linux-kernel - Re: [PATCH v3 0/3] leds: aw2013: Document interrupt and pull-up supply

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Date:   Wed, 16 Aug 2023 10:38:29 +0500
From:   Nikita Travkin <nikita@...n.ru>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lin, Meng-Bo" <linmengbo0689@...tonmail.com>
Subject: Re: [PATCH v3 0/3] leds: aw2013: Document interrupt and pull-up
 supply

Stephan Gerhold писал(а) 15.08.2023 22:21:
> AW2013 has an optional interrupt pin "INTN" which is used to report 
> completion of started operations (e.g. power up or LED breath effects). 
> The driver does not use it (yet) but it should be already described for 
> completeness inside the DT schema.
> 
> Since the interrupt and I2C lines operate in open drain low active mode 
> a pull-up supply is needed for correct operation. Unfortunately there 
> is no ideal place to describe it in the DT: The pull-up needed for the 
> I2C lines could be described on the I2C bus. However, the pull-up 
> needed for the interrupt line belongs neither directly to the interrupt 
> controller nor to AW2013. Since the AW2013 driver will be typically in 
> control of the power management and interrupt masking it makes more 
> sense to describe it inside the AW2013 device tree node.
> 

Oh indeed, seems like even on the hardware I was initially targeting,
the pull is tied to a regulator, I probably missed it because it was
always on. Thank you both for adding that and fixing up the bindings!

Reviewed-by: Nikita Travkin <nikita@...n.ru>

Nikita

> Changes in v3:
>   - Rewrite commit messages based on discussion on v2
>   - Also document missing interrupt in DT schema (new patch)
> 
> Discussion on v2:
> https://lore.kernel.org/linux-leds/20230321220825.GA1685482-robh@kernel.org/
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
> Lin, Meng-Bo (1):
>       leds: aw2013: Enable pull-up supply for interrupt and I2C
> 
> Stephan Gerhold (2):
>       dt-bindings: leds: aw2013: Document interrupt
>       dt-bindings: leds: Document pull-up supply for interrupt and I2C
> 
>  .../devicetree/bindings/leds/leds-aw2013.yaml      | 13 ++++++++
>  drivers/leds/leds-aw2013.c                         | 36 +++++++++++++---------
>  2 files changed, 35 insertions(+), 14 deletions(-)
> ---
> base-commit: 841165267827955bb3295b066cb6a906ba9265c0
> change-id: 20230815-aw2013-vio-92a4566c5863
> 
> Best regards,