linux-kernel - Re: [PATCH v3 1/2] leds: ncp5623: Add device tree binding documentation

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Date:   Fri, 23 Sep 2016 12:29:15 -0500
From:   Rob Herring <robh@...nel.org>
To:     Florian Vaussard <florian.vaussard@...il.com>
Cc:     devicetree@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        Mark Rutland <mark.rutland@....com>,
        Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Florian Vaussard <florian.vaussard@...g-vd.ch>
Subject: Re: [PATCH v3 1/2] leds: ncp5623: Add device tree binding
 documentation

On Fri, Sep 16, 2016 at 01:34:31PM +0200, Florian Vaussard wrote:
> Add device tree binding documentation for On Semiconductor NCP5623 I2C
> LED driver. The driver can independently control the PWM of the 3
> channels with 32 levels of intensity.
> 
> The current delivered by the current source can also be controlled. To
> do so, the led-max-microamp property is used by each LED sub-node. The
> maximum value is then found and used as a limit to compute the final
> intensity of the current source. If a LED happens to have a lower limit,
> the PWM is then used to limit the current to the requested value.
> 
> In order to control the current source, it is also necessary to know
> the current on the Iref pin, hence the onnn,led-iref-microamp property.
> It is usually set using an external bias resistor, following
> Iref = Vref/Rbias with Vref=0.6V.
> 
> Signed-off-by: Florian Vaussard <florian.vaussard@...g-vd.ch>
> ---
>  .../devicetree/bindings/leds/leds-ncp5623.txt      | 60 ++++++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-ncp5623.txt

Acked-by: Rob Herring <robh@...nel.org>