linux-kernel - Re: [PATCH v2 2/2] leds: Add control of the voltage/current regulator to the LED core

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Date:   Wed, 17 Jul 2019 15:47:16 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
CC:     <jacek.anaszewski@...il.com>, <pavel@....cz>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <dmurphy@...com>,
        <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] leds: Add control of the voltage/current regulator
 to the LED core


On 16/07/2019 12:50, Daniel Thompson wrote:
> On Mon, Jul 15, 2019 at 05:56:57PM +0200, Jean-Jacques Hiblot wrote:
>> A LED is usually powered by a voltage/current regulator. Let the LED core
> This is almost certainly nitpicking but since there's enough other
> review comments that you will have to respin anyway ;-)
No problems. comments are welcome.
> Is an LED really "usually powered by a voltage/current regulator"? Some
> LEDs have a software controlled power supply but I'm not sure it is
> the usual case.
True. I'll reword this.
> Likewise its a little confusing to be talking about LEDs with an
> external current regulator since, although that is possible, it is also
> one the main features provided by LED driver chips.

In my experience LED drivers are quite often current sinks. In that case 
the power is provided externally, and sometimes by a managed regulator.

Thanks,

JJ

>
> Daniel.