linux-kernel - Re: [PATCH 07/22] dt-bindings: power: supply: add AXP20X/AXP22X AC power supply

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Date:   Thu, 5 Jan 2017 14:17:35 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     Rob Herring <robh@...nel.org>, Jonathan Cameron <jic23@...nel.org>,
        knaack.h@....de, Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Sebastian Reichel <sre@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Lee Jones <lee.jones@...aro.org>, linux-iio@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Bruno Prémont <bonbons@...ux-vserver.org>
Subject: Re: [PATCH 07/22] dt-bindings: power: supply: add AXP20X/AXP22X AC
 power supply

Hi Quentin,

On Wed, Jan 4, 2017 at 9:14 PM, Rob Herring <robh@...nel.org> wrote:
> On Mon, Jan 02, 2017 at 05:37:07PM +0100, Quentin Schulz wrote:
>> The X-Powers AXP20X and AXP22X PMICs have an AC entry to supply power to
>> the board. They have a few registers dedicated to the status of the AC
>> power supply.
>>
>> This adds the DT binding documentation for the AC power supply for
>> AXP20X and AXP22X PMICs.
>>
>> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
>> ---
>>  .../bindings/power/supply/axp20x_ac_power.txt      | 28 ++++++++++++++++++++++
>>  1 file changed, 28 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt
>>
>> diff --git a/Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt b/Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt
>> new file mode 100644
>> index 0000000..16d0de4
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt
>> @@ -0,0 +1,28 @@
>> +AXP20X and AXP22X PMICs' AC power supply
>> +
>> +Required Properties:
>> + - compatible: One of:
>> +                     "x-powers,axp202-ac-power-supply"
>> +                     "x-powers,axp221-ac-power-supply"
>> +
>> +More Required Properties for AXP20X PMICs:
>> + - io-channels: phandles to ACIN voltage and current ADC channels
>> + - io-channel-names = "acin_v", "acin_i";
>> +
>> +This node is a subnode of the axp20x PMIC.
>> +
>> +The AXP20X can read the current current and voltage supplied by AC by
>> +reading ADC channels from the AXP20X ADC.
>> +
>> +The AXP22X is only able to tell if an AC power supply is present and
>> +usable.
>> +
>> +Example:
>> +
>> +&axp209 {
>> +     ac_power_supply: ac_power_supply {
>
> power-supply {
>
>> +             compatible = "x-powers,axp202-ac-power-supply";
>> +             io-channels = <&axp209_adc 0>, <&axp209_adc 1>;
>
> Is this assignment fixed? If so, then it doesn't need to be in DT.

Is there any case that we actually need to use the IIO channels
from the device tree? Seems to me its limited to the other AXP
sub-devices.

If so you could use struct iio_map to map the channels to other
devices by name. See axp288_adc for an example.

Regards
ChenYu

>> +             io-channel-names = "acin_v", "acin_i";
>> +     };
>> +};
>> --
>> 2.9.3
>>