Re: [PATCH/RFC v9 02/19] Documentation: leds: Add description of LED Flash class extension

[Jacek Anaszewski]

Hi Sakari,

On 12/09/2014 01:38 PM, Sakari Ailus wrote:

[...]

> > > How does the user btw. figure out which flash LEDs may be strobed
> > > synchronously using the LED flash interface?
> >
> > The flash_sync_strobe argument is absent if synchronized strobe
> > is not available for a LED. The driver defines this by setting
> > newly added LED_DEV_CAP_COMPOUND flag.
>
> I meant that how does the user figure out which LEDs may be strobed
> synchronously, together. Say, if you have two of these chips and four LEDs,
> then how does it work? :-)

User can figure it out by checking the existence of the
flash_sync_strobe attribute. Sub-leds can by synchronized only
when are driven by common chip. It is assumed that sub-leds of
one chip will have common segment in their name, defined in
DT 'label' property. Maybe we should enforce it by adding another
property to the leds/common.txt DT binding, e.g. 'device-prefix'?

Best Regards,
Jacek Anaszewski

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