Re: [PATCH v2 3/4] powerpc: wii.dts: Expose the OTP on this platform

[Emmanuel Gil Peyrot]

On Sat, Jun 26, 2021 at 11:34:01PM +0000, Jonathan Neuschäfer wrote:
> On Wed, May 19, 2021 at 11:50:43AM +0200, Emmanuel Gil Peyrot wrote:
> > This can be used by the newly-added nintendo-otp nvmem module.
> > 
> > Signed-off-by: Emmanuel Gil Peyrot <linkmauve@xxxxxxxxxxxx>
> > ---
> >  arch/powerpc/boot/dts/wii.dts | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/arch/powerpc/boot/dts/wii.dts b/arch/powerpc/boot/dts/wii.dts
> > index aaa381da1906..7837c4a3f09c 100644
> > --- a/arch/powerpc/boot/dts/wii.dts
> > +++ b/arch/powerpc/boot/dts/wii.dts
> > @@ -219,6 +219,11 @@ control@d800100 {
> >  			reg = <0x0d800100 0x300>;
> >  		};
> >  
> > +		otp@d8001ec {
> > +			compatible = "nintendo,hollywood-otp";
> > +			reg = <0x0d8001ec 0x8>;
> 
> The OTP registers overlap with the previous node, control@d800100.
> Not sure what's the best way to structure the devicetree in this case,
> maybe something roughly like the following (untested, unverified):
[snip]

I couldn’t get this to work, but additionally it looks like it should
start 0x100 earlier and contain pic1@d800030 and gpio@d8000c0, given
https://wiibrew.org/wiki/Hardware/Hollywood_Registers

Would it make sense, for the time being, to reduce the size of this
control@d800100 device to the single register currently being used by
arch/powerpc/platforms/embedded6xx/wii.c (0xd800194, used to reboot the
system) and leave the refactor of restart + OTP + PIC + GPIO for a
future series?

Thanks,

-- 
Emmanuel Gil Peyrot

Attachment: signature.asc
Description: PGP signature