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SubjectRe: [PATCH v2 3/8] dt-bindings: leds: Add binding for axp20x-led device driver
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On 2/22/19 8:51 PM, Rob Herring wrote:
> On Fri, Feb 15, 2019 at 01:50:08PM +0200, Stefan Mavrodiev wrote:
>> This adds the devicetree bindings for charge led indicator found
>> on most of X-Powers AXP20X PMICs.
>>
>> Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
>> ---
>> .../devicetree/bindings/leds/leds-axp20x.txt | 74 +++++++++++++++++++
>> 1 file changed, 74 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/leds/leds-axp20x.txt
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-axp20x.txt b/Documentation/devicetree/bindings/leds/leds-axp20x.txt
>> new file mode 100644
>> index 000000000000..5a83ad06796d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/leds-axp20x.txt
>> @@ -0,0 +1,74 @@
>> +Device Tree Bindings for LED support on X-Powers PMIC
>> +
>> +Most of the X-Powers PMICs have integrated battery charger with LED indicator.
>> +The output is open-drain, so the state is either high-Z or output-low. The
>> +driver is a subnode of AXP20X MFD driver, since it uses shared bus with all
>> +other cells.
>> +The LED can be controlled either manually or automatically. Then in automatic
>> +(controlled by the charger) there are two indication modes:
>> +
>> +Mode-A
>> +======
>> +- output-low: Charging
>> +- high-Z Not charging
>> +- 1Hz flashing: Abnormal alarm
>> +- 4Hz flashing Overvoltage alarm
>> +
>> +Mode-B
>> +======
>> +- output-low: Battery full
>> +- high-Z Not charging
>> +- 1Hz flashing: Charging
>> +- 4Hz flashing Overvoltage or abnormal alarm
>> +
>> +The control and the mode can be changed from sysfs.
>> +
>> +For AXP20X MFD bindings see:
>> +Documentation/devicetree/bindings/mfd/axp20x.txt
>> +
>> +Required properties:
>> +- compatible : Must be "x-powers,axp20x-led"
>> +
>> +Supported common LED properties, see ./common.txt for more informationn
>> +- label : See Documentation/devicetree/bindings/leds/common.txt
>> +- linux,default-trigger : See Documentation/devicetree/bindings/leds/common.txt
>> +- default-state: See Documentation/devicetree/bindings/leds/common.txt
>> +
>> +Optional properties:
>> +- x-powers,charger-mode: 0 for Mode-A, 1 for Mode-B
>> + If omitted, then the control is set to manual mode.
>> + On invalid value, Mode-A is used.
>> +
>> +
>> +Example:
>> +
>> + axp803: pmic@3a3 {
>> + compatible = "x-powers,axp803";
>> +
>> + ...
>> +
>> + led@0 {
>
> What's the 0 for? A unit address without a reg property is not valid.

It was done on my request, but now I see it was an omission.

Since this node describes a LED controller, then it should
be called "led-controller".

>> + compatible = "x-powers,axp20x-led";
>> + status = "okay";

And below part should be in a child node.

Stefan, please compare
Documentation/devicetree/bindings/leds/common.txt and
other LED bindings.

>> + label = "axp20x:yellow:chgled";

Moreover "axp20x:" part should be removed from here added in the driver.

Please refer to drivers/leds/leds-cr0014114.c on how we
do that now.

>> + linux,default-trigger = "timer";
>> + default-state = "on";
>> + };
>> + };
>> +
>> +or
>> +
>> + axp803: pmic@3a3 {
>> + compatible = "x-powers,axp803";
>> +
>> + ...
>> +
>> + led@0 {
>> + compatible = "x-powers,axp20x-led";
>> + status = "okay";
>> +
>> + label = "axp20x:yellow:chgled";
>> + x-powers,charger-mode = <1>;
>> + };
>> + };
>> --
>> 2.17.1
>>
>

--
Best regards,
Jacek Anaszewski

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