> On Thu, Dec 05, 2013 at 04:43:37PM +0100, Denis Carikli wrote:
> > pwmr has to be set to get the imxfb backlight work,
> > though pwmr was only configurable trough the platform data.
> >
> > Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> > Cc: Pawel Moll <pawel.moll@xxxxxxx>
> > Cc: Mark Rutland <mark.rutland@xxxxxxx>
> > Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
> > Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
> > Cc: devicetree@xxxxxxxxxxxxxxx
> > Cc: Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>
> > Cc: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> > Cc: linux-fbdev@xxxxxxxxxxxxxxx
> > Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx>
> > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > Cc: Eric Bénard <eric@xxxxxxxxxx>
> > Signed-off-by: Denis Carikli <denis@xxxxxxxxxx>
> > Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
> > Acked-by: Grant Likely <grant.likely@xxxxxxxxxx>
> > ---
> > .../devicetree/bindings/video/fsl,imx-fb.txt | 3 +++
> > drivers/video/imxfb.c | 2 ++
> > 2 files changed, 5 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/video/fsl,imx-fb.txt b/Documentation/devicetree/bindings/video/fsl,imx-fb.txt
> > index 46da08d..ac457ae 100644
> > --- a/Documentation/devicetree/bindings/video/fsl,imx-fb.txt
> > +++ b/Documentation/devicetree/bindings/video/fsl,imx-fb.txt
> > @@ -17,6 +17,9 @@ Required nodes:
> > Optional properties:
> > - fsl,dmacr: DMA Control Register value. This is optional. By default, the
> > register is not modified as recommended by the datasheet.
> > +- fsl,pwmr: LCDC PWM Contrast Control Register value. That property is
> > + optional, but defining it is necessary to get the backlight working. If that
> > + property is ommited, the register is zeroed.
>
> Why isn't this implemented as a backlight driver? Static devicetree
> provided values is very limiting.
Let's understand the terminology.
This register should be renamed according to the datasheet, i.e. LPCCR.
As I pointed out earlier, it is NOT control the backlight, this is a contrast control.
Yes, it works as PWM, but nothing do with the backlight subsystem.
Yes, we can make a driver for this PWM, but how are we going to control it?
I misunderstood something?
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