Re: [PATCH 4/7] ARM: dts: sun6i: Add simplefb node

[Maxime Ripard <maxime.ripard@free-electrons.com>]

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On Thu, Nov 13, 2014 at 06:52:57PM +0100, Hans de Goede wrote:
> Hi,
> 
> On 11/13/2014 05:46 PM, Maxime Ripard wrote:
> > Hi,
> > 
> > On Thu, Nov 13, 2014 at 10:31:46AM +0100, Hans de Goede wrote:
> >> Add a simplefb template node for u-boot to further fill and activate.
> >>
> >> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> >> ---
> >>  arch/arm/boot/dts/sun6i-a31.dtsi | 10 ++++++++++
> >>  1 file changed, 10 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/sun6i-a31.dtsi b/arch/arm/boot/dts/sun6i-a31.dtsi
> >> index 543f895..438952e 100644
> >> --- a/arch/arm/boot/dts/sun6i-a31.dtsi
> >> +++ b/arch/arm/boot/dts/sun6i-a31.dtsi
> >> @@ -62,6 +62,16 @@
> >>  		ethernet0 = &gmac;
> >>  	};
> >>  
> >> +	chosen {
> >> +		#address-cells = <1>;
> >> +		#size-cells = <1>;
> >> +		ranges;
> >> +
> >> +		framebuffer0 {
> >> +			compatible = "simple-framebuffer";
> >> +			status = "disabled";
> > 
> > Aren't we suppose to have clocks in there too?
> 
> I deliberately left them out as they are not needed on sun6i, once the blocks
> are setup ahb access is not necessary, but it seems that the ahb_gate bits
> in sun4i / sun5i / sun7i double as a reset. Toggling them on / off / on breaks
> the mode, while toggling module clocks on / off / on only causes a glitch.
> 
> Since the sun6i has a separate reset controller, the clock gates seem to really
> only control ahb access which is not necessary once the mode has been set up.

Ok. That can always be changed in the future if we ever find we need
them anyway.

I'll merge these four patches as soon as the bindings doc is
acked-by/merged by Grant or any other DT maintainer.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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