linux-kernel - Re: [PATCH 03/10] dt-bindings: iio: adc: axp209: Add AXP192 compatible

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Date:   Sat, 04 Jun 2022 12:33:25 +0100
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     linus.walleij@...aro.org, brgl@...ev.pl, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, wens@...e.org,
        lee.jones@...aro.org, sre@...nel.org, broonie@...nel.org,
        gregkh@...uxfoundation.org, lgirdwood@...il.com, lars@...afoo.de,
        rafael@...nel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/10] dt-bindings: iio: adc: axp209: Add AXP192 compatible


Jonathan Cameron <jic23@...nel.org> writes:

> On Fri,  3 Jun 2022 14:57:07 +0100
> Aidan MacDonald <aidanmacdonald.0x0@...il.com> wrote:
>
>> The AXP192 is identical to the AXP20x, except for two additional
>> GPIO ADC channels.
>> 
>> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>
> There is an argument that could be made here to say this should
> have a fallback compatible to a suitable existing part as the driver
> would work, we'd just be missing a couple of channels.
>
> I don't feel strongly either way, but thought I'd raise the possibility.
>
> I guess it's irrelevant if an updated kernel is needed anyway to have
> it functional because of support needed for some other part of the chip
> though.
>
> Jonathan
>

That may be possible, but you can't probe the IIO driver without having
an updated MFD driver so I'm not sure a fallback compatible is needed.

Regards,
Aidan

>> ---
>>  .../bindings/iio/adc/x-powers,axp209-adc.yaml  | 18 ++++++++++++++++++
>>  1 file changed, 18 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/iio/adc/x-powers,axp209-adc.yaml b/Documentation/devicetree/bindings/iio/adc/x-powers,axp209-adc.yaml
>> index d6d3d8590171..1a68e650ac7d 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/x-powers,axp209-adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/x-powers,axp209-adc.yaml
>> @@ -14,6 +14,23 @@ description: |
>>    Device is a child of an axp209 multifunction device
>>    ADC channels and their indexes per variant:
>>  
>> +  AXP192
>> +  ------
>> +   0 | acin_v
>> +   1 | acin_i
>> +   2 | vbus_v
>> +   3 | vbus_i
>> +   4 | pmic_temp
>> +   5 | gpio0_v
>> +   6 | gpio1_v
>> +   7 | gpio2_v
>> +   8 | gpio3_v
>> +   9 | ipsout_v
>> +  10 | batt_v
>> +  11 | batt_chrg_i
>> +  12 | batt_dischrg_i
>> +  13 | ts_v
>> +
>>    AXP209
>>    ------
>>     0 | acin_v
>> @@ -50,6 +67,7 @@ description: |
>>  properties:
>>    compatible:
>>      oneOf:
>> +      - const: x-powers,axp192-adc
>>        - const: x-powers,axp209-adc
>>        - const: x-powers,axp221-adc
>>        - const: x-powers,axp813-adc