linux-kernel - Re: [PATCH 4/7] dt-bindings: power: supply: Add docs for Ingenic JZ47xx SoCs battery.

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Date:   Thu, 28 Feb 2019 21:22:15 +0100
From:   Artur Rojek <contact@...ur-rojek.eu>
To:     Rob Herring <robh@...nel.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: Re: [PATCH 4/7] dt-bindings: power: supply: Add docs for Ingenic
 JZ47xx SoCs battery.

Hi Rob,

thanks for the review.

On 2019-02-28 19:48, Rob Herring wrote:
> On Sun, Feb 17, 2019 at 03:29:13PM +0100, Artur Rojek wrote:
>> Add documentation for the ingenic-battery driver, used on JZ47xx SoCs.
>> 
>> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
>> ---
>>  .../bindings/power/supply/ingenic,battery.txt | 31 
>> +++++++++++++++++++
>>  1 file changed, 31 insertions(+)
>>  create mode 100644 
>> Documentation/devicetree/bindings/power/supply/ingenic,battery.txt
>> 
>> diff --git 
>> a/Documentation/devicetree/bindings/power/supply/ingenic,battery.txt 
>> b/Documentation/devicetree/bindings/power/supply/ingenic,battery.txt
>> new file mode 100644
>> index 000000000000..66430bf73815
>> --- /dev/null
>> +++ 
>> b/Documentation/devicetree/bindings/power/supply/ingenic,battery.txt
>> @@ -0,0 +1,31 @@
>> +* Ingenic JZ47xx battery bindings
>> +
>> +Required properties:
>> +
>> +- compatible: Must be "ingenic,jz4740-battery".
>> +- io-channels: phandle and IIO specifier pair to the IIO device.
>> +  Format described in iio-bindings.txt.
>> +- monitored-battery: phandle to a "simple-battery" compatible node.
>> +
>> +The "monitored-battery" property must be a phandle to a node using 
>> the format
>> +described in battery.txt, with the following properties being 
>> required:
>> +
>> +- voltage-min-design-microvolt: Drained battery voltage.
>> +- voltage-max-design-microvolt: Fully charged battery voltage.
>> +
>> +Example:
>> +
>> +#include <dt-bindings/iio/adc/ingenic,adc.h>
>> +
>> +simple_battery: battery {
>> +	compatible = "simple-battery";
>> +	voltage-min-design-microvolt = <3600000>;
>> +	voltage-max-design-microvolt = <4200000>;
>> +};
>> +
>> +ingenic_battery {
>> +	compatible = "ingenic,jz4740-battery";
>> +	io-channels = <&adc INGENIC_ADC_BATTERY>;
>> +	io-channel-names = "battery";
>> +	monitored-battery = <&simple_battery>;
> 
> Isn't this just an ADC monitored battery? What's specific to JZ4740?
> 
> Maybe a generic binding is appropriate here?
This isn't quite a generic driver; see Jonathan's reply to patch 5/7.

- Artur
> 
> Rob