Re: [PATCH v5 1/2] dt: add cap11xx LED documentation

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On Tue, Jun 23, 2015 at 11:07 AM, Dmitry Torokhov
<dmitry.torokhov@xxxxxxxxx> wrote:
> On Tue, Jun 23, 2015 at 10:23:57AM -0700, Matt Ranostay wrote:
>> On Tue, Jun 23, 2015 at 1:36 AM, Jacek Anaszewski
>> <j.anaszewski@xxxxxxxxxxx> wrote:
>> > On 06/22/2015 07:59 PM, Dmitry Torokhov wrote:
>> >>
>> >> On Wed, Jun 17, 2015 at 08:58:16PM -0700, Matt Ranostay wrote:
>> >>>
>> >>> Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx>
>> >>> ---
>> >>>   .../devicetree/bindings/input/cap11xx.txt          | 25
>> >>> ++++++++++++++++++++++
>> >>>   1 file changed, 25 insertions(+)
>> >>>
>> >>> diff --git a/Documentation/devicetree/bindings/input/cap11xx.txt
>> >>> b/Documentation/devicetree/bindings/input/cap11xx.txt
>> >>> index 7d0a300..09cdc43 100644
>> >>> --- a/Documentation/devicetree/bindings/input/cap11xx.txt
>> >>> +++ b/Documentation/devicetree/bindings/input/cap11xx.txt
>> >>> @@ -38,6 +38,11 @@ Optional properties:
>> >>>                                 defaults. The array must have exactly six
>> >>>                                 entries.
>> >>>
>> >>> +       linux,led-brightness:   Defines the ON brightness when the
>> >>> optional LED
>> >>> +                               functionality is used. Valid values are
>> >>> 1-15.
>> >>> +                               By default a value of 15 is set.
>> >>
>> >>
>> >> Please mention the device does not allow controlling brightness of leds
>> >> individually and that is why this property is at device level, not
>> >> individual led level.
>> >
>> >
>> > I've just noticed that we have drivers/leds/leds-netxbig.c driver, which
>> > also doesn't allow controlling the LEDs on extension board individually,
>> > but it still does allow changing their brightness. I am leaning towards
>> > allowing this also for this driver and adding similar comment in the
>> > source code like at the line 218 of the aforementioned driver.
>> > As a result this property wouldn't be required.
>> >
>>
>> Ok that should be pretty simple to do. But seems kind weird to have
>> each led channel to be changing the brightness of all.  Wouldn't the
>> brightness sysfs entries of the other led channels be showing
>> incorrect values?
>
> I agree, this is kind of weird. Maybe we should have a device-specific
> attribute (on the platform device level) that allows controlling overall
> brightness, but I think LEDs should be just on/off with max brightness
> of 1. Userspace should not have to be aware about the fact that on that
> particular device LEDs are not completely independent as far as their
> brightness goes.

So should I drop the devicetree part of the patch in v6?

>
> Thanks.
>
> --
> Dmitry
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