[PATCH 4/5] dt: add bindings for ZTE tvenc device

[Shawn Guo]

On Thu, Jan 19, 2017 at 06:11:17PM +0100, Lucas Stach wrote:
> Am Freitag, den 20.01.2017, 00:24 +0800 schrieb Shawn Guo:
> > From: Shawn Guo <shawn.guo at linaro.org>
> > 
> > It adds bindings doc for ZTE VOU TV Encoder device.
> > 
> > Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> > ---
> >  Documentation/devicetree/bindings/display/zte,vou.txt | 15 +++++++++++++++
> >  1 file changed, 15 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/zte,vou.txt b/Documentation/devicetree/bindings/display/zte,vou.txt
> > index 740e5bd2e4f7..9c356284232b 100644
> > --- a/Documentation/devicetree/bindings/display/zte,vou.txt
> > +++ b/Documentation/devicetree/bindings/display/zte,vou.txt
> > @@ -49,6 +49,15 @@ Required properties:
> >  	"osc_clk"
> >  	"xclk"
> >  
> > +* TV Encoder output device
> > +
> > +Required properties:
> > + - compatible: should be "zte,zx296718-tvenc"
> > + - reg: Physical base address and length of the TVENC device IO region
> > + - zte,tvenc-power-control: the phandle to SYSCTRL block followed by two
> > +   integer cells.  The first cell is the offset of SYSCTRL register used
> > +   to control TV Encoder DAC power, and the second cell is the bit mask.
> 
> I don't know much about this platform, but shouldn't this be handled
> with a proper power domain driver, rather than bashing bits directly?

There is a power domain controller (PCU) on ZTE platform which controls
power for a list of hardware blocks [1].  TVENC DAC is not on the list.
Rather than PCU, it's controlled by SYSCTRL block which contains various
control bits for various aspects of the system.

Shawn

[1] https://git.kernel.org/cgit/linux/kernel/git/shawnguo/linux.git/commit/?h=zte/pm-domains&id=eea1d99b900fe19dce3042dac555c270221be147