linux-kernel - Re: [PATCH 3/3] ARM: dts: axp209: Add iio-hwmon node for internal temperature

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Date:   Thu, 20 Apr 2023 20:06:09 +0100
From:   Jonathan McDowell <noodles@...th.li>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: dts: axp209: Add iio-hwmon node for internal
 temperature

On Sun, Apr 16, 2023 at 09:27:46AM +0200, Krzysztof Kozlowski wrote:
> On 15/04/2023 19:47, Jonathan McDowell wrote:
> > This adds a DT node to hook up the internal temperature ADC to the
> 
> Do not use "This commit/patch", but imperative mood. See:
> https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95
> 
> > iio-hwmon driver. The various voltage + current ADCs are consumed and
> > exposed by their respective drivers, but this is not and is always
> > available. Naming chosen to match the axp20x_ prefix the power sensors
> > use.
> 
> Weird choice.

You think? I didn't choose the axp20x_ prefix for the others, but it
made sense to me that all the sensors from the same device would be
identifiable as such. From your comment below it sounds like you'd
prefer I use the more generic pmic-temp as the node name? Will do for
v2.

> > Signed-off-by: Jonathan McDowell <noodles@...th.li>
> > ---
> >  arch/arm/boot/dts/axp209.dtsi | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/axp209.dtsi b/arch/arm/boot/dts/axp209.dtsi
> > index ca240cd6f6c3..f00b5a7ec106 100644
> > --- a/arch/arm/boot/dts/axp209.dtsi
> > +++ b/arch/arm/boot/dts/axp209.dtsi
> > @@ -48,6 +48,13 @@
> >   * http://dl.linux-sunxi.org/AXP/AXP209%20Datasheet%20v1.0_cn.pdf
> >   */
> >  
> > +/ {
> > +	axp20x_temp {
> 
> No underscores in node names.
> 
> Node names should be generic.
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
> 
> > +		compatible = "iio-hwmon";
> > +		io-channels = <&axp_adc 4>; /* Internal temperature */
> > +	};
> > +};
> > +
> >  &axp209 {
> >  	compatible = "x-powers,axp209";
> >  	interrupt-controller;

J.

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