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From: Alexandre Courbot <gnurou@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	Felipe Balbi <balbi@ti.com>, Bryan Wu <cooloney@gmail.com>,
	Richard Purdie <rpurdie@rpsys.net>,
	"linux-leds@vger.kernel.org" <linux-leds@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>
Subject: Re: "advanced" LED controllers
Date: Tue, 3 Mar 2015 17:15:29 +0900	[thread overview]
Message-ID: <CAAVeFuK9eGO2TN+tgDyN8EFzEhgHOy5YCch+LaqS9PNaQXQ4Qg@mail.gmail.com> (raw)
In-Reply-To: <20150302092111.GA19233@amd>

On Mon, Mar 2, 2015 at 6:21 PM, Pavel Machek <pavel@ucw.cz> wrote:
> On Wed 2015-02-25 18:06:07, Alexandre Courbot wrote:
>> On Wed, Feb 25, 2015 at 5:25 PM, Geert Uytterhoeven
>> <geert@linux-m68k.org> wrote:
>> > CC linux-gpio, as this looks like the LED equivalent of bulk gpio?
>>
>> Indeed. The LED core could implement something similar to
>> gpiod_set_array() to allow several LEDs to be set in one call. If the
>> controller supports it, it would then set all the LEDs at once,
>> otherwise the core would apply the values serially.
>>
>> In leds-gpio.c, this multiple LED setting could be implemented by a
>> single call to gpiod_set_array() and the right thing would happen.
>
> Actually, there are two issues: some controlles can set all LEDs at
> once, and some can program pwm level smoothly using given program (and
> handle multiple leds in the process).

In any case, that would be handled at the controller level and should
work with a function similar to gpiod_set_array(), wouldn't it?

  reply	other threads:[~2015-03-03  8:15 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-19 21:14 Felipe Balbi
2015-02-23 22:34 ` Pavel Machek
2015-02-23 22:58   ` Felipe Balbi
2015-02-25 21:49     ` Pavel Machek
2015-02-25 23:55       ` NeilBrown
2015-02-28 16:18         ` Pavel Machek
2015-02-25  8:25 ` Geert Uytterhoeven
2015-02-25  9:06   ` Alexandre Courbot
2015-03-02  9:21     ` Pavel Machek
2015-03-03  8:15       ` Alexandre Courbot [this message]
2015-03-08 20:57         ` RGB LED control (was Re: "advanced" LED controllers) Pavel Machek
2015-03-09  8:08           ` Geert Uytterhoeven
2015-03-09  9:08             ` Pavel Machek
2015-03-09 11:50             ` Måns Rullgård
2015-03-10  8:04               ` Pavel Machek
     [not found]                 ` <CAK5ve-K4jyBSVk1CZ8qQrFgevqdbhdsgZ1ZYX2e-t07494oq4A@mail.gmail.com>
2015-03-11  9:34                   ` Documentation: leds: clarify what 50% brightness means Pavel Machek

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