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From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Gene Chen <gene.chen.richtek@gmail.com>,
	robh+dt@kernel.org, Matthias Brugger <matthias.bgg@gmail.com>,
	Dan Murphy <dmurphy@ti.com>,
	linux-leds@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	Gene Chen <gene_chen@richtek.com>,
	Wilma.Wu@mediatek.com, shufan_lee@richtek.com,
	cy_huang@richtek.com, benjamin.chao@mediatek.com
Subject: Re: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360
Date: Thu, 10 Sep 2020 22:31:28 +0200	[thread overview]
Message-ID: <7ce924da-5119-0406-7995-560c32097040@gmail.com> (raw)
In-Reply-To: <20200910202510.GB18431@ucw.cz>

On 9/10/20 10:25 PM, Pavel Machek wrote:
> Hi!
> 
>>>> 1. set FLED1 brightness
>>>> # echo 1 > /sys/class/leds/white:flash1/flash_brightness
>>>> 2. enable FLED1 strobe
>>>> # echo 1 > /sys/class/leds/white:flash1/flash_strobe
>>>> 3 . turn off FLED1 strobe (just used to gaurantee the strobe mode
>>>> flash leds must be turned off)
>>>> # echo 0 > /sys/class/leds/white:flash1/flash_strobe
>>>
>>> I believe I'd preffer only exposing torch functionality in
>>> /sys/class/leds. .. strobe can be supported using v4l2 APIs.
>>
>> Actually having LED flash class without strobe is pointless.
>> If you looked at led_classdev_flash_register_ext() you would see that
>> it fails with uninitialized strobe_set op. And V4L2 API for strobing
>> flash calls strobe_set from LED flash class beneath.
>>
>> That was the idea behind LED and V4L2 flash API unification - there
>> is one hardware driver needed, the V4L2 Flash layer just takes over
>> control over it when needed.
> 
> I agree that one driver is enough.
> 
> But we should not need flash_strobe file in sysfs. Simply use V4L2 for
> that.

Apart from the fact that we can't remove it from LED flash class ABI
now, why would you like to prevent the user from exploiting main feature
of the hardware?

-- 
Best regards,
Jacek Anaszewski

  reply	other threads:[~2020-09-10 20:37 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-07 10:27 [PATCH v3 0/2] leds: mt6360: Add LED driver for MT6360 Gene Chen
2020-09-07 10:27 ` [PATCH v3 1/2] " Gene Chen
2020-09-08 14:13   ` Dan Murphy
2020-09-08 22:25   ` Pavel Machek
2020-09-09 23:49     ` Gene Chen
2020-09-10 12:29       ` Pavel Machek
2020-09-10 20:23         ` Jacek Anaszewski
2020-09-10 20:25           ` Pavel Machek
2020-09-10 20:31             ` Jacek Anaszewski [this message]
2020-09-09 13:48   ` Andy Shevchenko
2020-09-10  0:11     ` Gene Chen
2020-09-10  8:18       ` Pavel Machek
2020-09-10 11:34         ` Andy Shevchenko
2020-09-10 12:28           ` Pavel Machek
2020-09-10 11:46       ` Andy Shevchenko
2020-09-10 21:42   ` Jacek Anaszewski
2020-09-11  7:05     ` Pavel Machek
2020-09-10 23:24       ` Gene Chen
2020-09-11 21:21         ` Jacek Anaszewski
2020-09-11 20:56       ` Jacek Anaszewski
2020-09-07 10:27 ` [PATCH v3 2/2] dt-bindings: leds: Add bindings for MT6360 LED Gene Chen
2020-09-08 13:55   ` Dan Murphy
2020-09-08 22:22   ` Pavel Machek
2020-09-15 15:51   ` Rob Herring
2020-09-08 14:14 ` [PATCH v3 0/2] leds: mt6360: Add LED driver for MT6360 Dan Murphy
2020-09-09  0:00   ` Gene Chen

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