linux-kernel - Re: [PATCH v2 1/5] dt-bindings: iio: adc: Add MediaTek MT6359 PMIC AUXADC

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Date: Mon, 1 Jul 2024 11:17:47 -0600
From: Rob Herring <robh@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	lars@...afoo.de, krzk+dt@...nel.org, conor+dt@...nel.org,
	matthias.bgg@...il.com, lee@...nel.org, andy@...nel.org,
	nuno.sa@...log.com, bigunclemax@...il.com, dlechner@...libre.com,
	marius.cristea@...rochip.com, marcelo.schmitt@...log.com,
	fr0st61te@...il.com, mitrutzceclan@...il.com,
	mike.looijmans@...ic.nl, marcus.folkesson@...il.com,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, andy.shevchenko@...il.com,
	kernel@...labora.com
Subject: Re: [PATCH v2 1/5] dt-bindings: iio: adc: Add MediaTek MT6359 PMIC
 AUXADC

On Mon, Jun 17, 2024 at 08:33:14PM +0100, Jonathan Cameron wrote:
> On Mon, 10 Jun 2024 10:00:55 +0200
> AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> wrote:
> 
> > Il 06/06/24 01:52, Rob Herring ha scritto:
> > > On Tue, Jun 04, 2024 at 02:30:04PM +0200, AngeloGioacchino Del Regno wrote:  
> > >> Add a new binding for the MT6350 Series (MT6357/8/9) PMIC AUXADC,
> > >> providing various ADC channels for both internal temperatures and
> > >> voltages, audio accessory detection (hp/mic/hp+mic and buttons,
> > >> usually on a 3.5mm jack) other than some basic battery statistics
> > >> on boards where the battery is managed by this PMIC.
> > >>
> > >> Also add the necessary dt-binding headers for devicetree consumers.
> > >>
> > >> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> > >> ---
> > >>   .../iio/adc/mediatek,mt6359-auxadc.yaml       | 33 +++++++++++++++++++
> > >>   .../iio/adc/mediatek,mt6357-auxadc.h          | 21 ++++++++++++
> > >>   .../iio/adc/mediatek,mt6358-auxadc.h          | 22 +++++++++++++
> > >>   .../iio/adc/mediatek,mt6359-auxadc.h          | 22 +++++++++++++
> > >>   4 files changed, 98 insertions(+)
> > >>   create mode 100644 Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
> > >>   create mode 100644 include/dt-bindings/iio/adc/mediatek,mt6357-auxadc.h
> > >>   create mode 100644 include/dt-bindings/iio/adc/mediatek,mt6358-auxadc.h
> > >>   create mode 100644 include/dt-bindings/iio/adc/mediatek,mt6359-auxadc.h
> > >>
> > >> diff --git a/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml b/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
> > >> new file mode 100644
> > >> index 000000000000..6497c416094d
> > >> --- /dev/null
> > >> +++ b/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
> > >> @@ -0,0 +1,33 @@
> > >> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > >> +%YAML 1.2
> > >> +---
> > >> +$id: http://devicetree.org/schemas/iio/adc/mediatek,mt6359-auxadc.yaml#
> > >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > >> +
> > >> +title: MediaTek MT6350 series PMIC AUXADC
> > >> +
> > >> +maintainers:
> > >> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> > >> +
> > >> +description:
> > >> +  The Auxiliary Analog/Digital Converter (AUXADC) is an ADC found
> > >> +  in some MediaTek PMICs, performing various PMIC related measurements
> > >> +  such as battery and PMIC internal voltage regulators temperatures,
> > >> +  accessory detection resistance (usually, for a 3.5mm audio jack)
> > >> +  other than voltages for various PMIC internal components.
> > >> +
> > >> +properties:
> > >> +  compatible:
> > >> +    enum:
> > >> +      - mediatek,mt6357-auxadc
> > >> +      - mediatek,mt6358-auxadc
> > >> +      - mediatek,mt6359-auxadc
> > >> +
> > >> +  "#io-channel-cells":
> > >> +    const: 1  
> > > 
> > > Why do you need a node here? Just add #io-channel-cells to the parent
> > > node.
> > >   
> > 
> > Because some boards will want to avoid probing the related driver, as that will
> > trigger a reset and this may not play well with ECs (namely, some Chromebooks),
> > which are reading the same AUXADC block.
> > 
> > If I avoid using a new node, instead of just using `status`, I'll have to add a
> > "mediatek,disable-auxadc" property to the parent node, which isn't pretty...
> 
> Rob, does this answer the question to your satisfaction?
> 
> If you are fine with this I'd like to queue it up (with the typo in one of the
> patch descriptions that Andy caught fixed up).

Yes.

Reviewed-by: Rob Herring <robh@...nel.org>