From: Jacek Anaszewski <j.anaszewski@samsung.com>
To: Sakari Ailus <sakari.ailus@iki.fi>
Cc: linux-leds@vger.kernel.org, linux-media@vger.kernel.org,
linux-kernel@vger.kernel.org, kyungmin.park@samsung.com,
b.zolnierkie@samsung.com, pavel@ucw.cz, cooloney@gmail.com,
rpurdie@rpsys.net, s.nawrocki@samsung.com, robh+dt@kernel.org,
pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org
Subject: Re: [PATCH/RFC v9 02/19] Documentation: leds: Add description of LED Flash class extension
Date: Tue, 09 Dec 2014 14:14:08 +0100 [thread overview]
Message-ID: <5486F5A0.9060700@samsung.com> (raw)
In-Reply-To: <20141209123819.GJ15559@valkosipuli.retiisi.org.uk>
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
next prev parent reply other threads:[~2014-12-09 13:14 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-03 16:06 [PATCH/RFC v9 00/19] LED / flash API integration Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 01/19] leds: Add LED Flash class extension to the LED subsystem Jacek Anaszewski
2014-12-03 16:50 ` Sakari Ailus
2014-12-04 9:29 ` Jacek Anaszewski
2014-12-09 12:36 ` Sakari Ailus
2014-12-09 12:56 ` Jacek Anaszewski
2014-12-09 14:12 ` Sakari Ailus
2014-12-03 16:06 ` [PATCH/RFC v9 02/19] Documentation: leds: Add description of LED Flash class extension Jacek Anaszewski
2014-12-03 17:08 ` Sakari Ailus
2014-12-04 9:42 ` Jacek Anaszewski
2014-12-09 12:38 ` Sakari Ailus
2014-12-09 13:14 ` Jacek Anaszewski [this message]
2014-12-03 16:06 ` [PATCH/RFC v9 03/19] mfd: max77693: Modify flash cell name identifiers Jacek Anaszewski
2014-12-09 8:52 ` Lee Jones
2014-12-09 9:18 ` Jacek Anaszewski
2014-12-09 10:02 ` Lee Jones
2014-12-03 16:06 ` [PATCH/RFC v9 04/19] mfd: max77693: adjust max77693_led_platform_data Jacek Anaszewski
2014-12-09 8:50 ` Lee Jones
2014-12-09 9:09 ` Jacek Anaszewski
2014-12-09 10:04 ` Lee Jones
2014-12-09 10:25 ` Jacek Anaszewski
2014-12-09 13:50 ` Lee Jones
2014-12-09 14:02 ` Jacek Anaszewski
2014-12-09 14:41 ` Lee Jones
2014-12-09 15:08 ` Sylwester Nawrocki
2014-12-10 12:38 ` Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 05/19] leds: Add support for max77693 mfd flash cell Jacek Anaszewski
2014-12-04 9:39 ` Sakari Ailus
2014-12-04 11:06 ` Jacek Anaszewski
2014-12-09 13:11 ` Sakari Ailus
2014-12-11 13:53 ` Jacek Anaszewski
2014-12-11 15:48 ` Sakari Ailus
2014-12-03 16:06 ` [PATCH/RFC v9 06/19] DT: Add documentation for the mfd Maxim max77693 Jacek Anaszewski
2014-12-04 10:07 ` Sakari Ailus
2014-12-04 11:40 ` Jacek Anaszewski
2014-12-04 16:12 ` Pavel Machek
2014-12-08 10:29 ` Jacek Anaszewski
2014-12-08 10:29 ` Jacek Anaszewski
2014-12-10 12:20 ` Sylwester Nawrocki
2014-12-10 12:41 ` Jacek Anaszewski
2014-12-09 14:09 ` Sakari Ailus
2014-12-09 14:13 ` Jacek Anaszewski
2014-12-10 10:02 ` Jacek Anaszewski
2014-12-10 10:50 ` Sakari Ailus
2014-12-10 10:59 ` Sylwester Nawrocki
2014-12-03 16:06 ` [PATCH/RFC v9 07/19] dt-binding: mfd: max77693: Add DT binding related macros Jacek Anaszewski
2014-12-30 22:15 ` Sakari Ailus
2014-12-03 16:06 ` [PATCH/RFC v9 08/19] leds: Add driver for AAT1290 current regulator Jacek Anaszewski
2014-12-11 14:16 ` Sakari Ailus
2014-12-11 15:34 ` Jacek Anaszewski
2014-12-11 15:52 ` Sakari Ailus
2014-12-03 16:06 ` [PATCH/RFC v9 09/19] of: Add Skyworks Solutions, Inc. vendor prefix Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 10/19] DT: Add documentation for the Skyworks AAT1290 Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 11/19] v4l2-async: change custom.match callback argument type Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 12/19] v4l2-async: add V4L2_ASYNC_MATCH_CUSTOM_OF matching type Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 13/19] v4l2-ctrls: Add V4L2_CID_FLASH_SYNC_STROBE control Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 14/19] media: Add registration helpers for V4L2 flash sub-devices Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 15/19] Documentation: leds: Add description of v4l2-flash sub-device Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 16/19] exynos4-is: Add support for v4l2-flash subdevs Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 17/19] DT: Add documentation for exynos4-is 'flashes' property Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 18/19] leds: max77693: add support for V4L2 Flash sub-device Jacek Anaszewski
2014-12-03 16:06 ` [PATCH/RFC v9 19/19] leds: aat1290: " Jacek Anaszewski
2014-12-10 13:48 ` Sakari Ailus
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