[linux-yocto] [PATCH 1/1] meta: add baytrail scc & config files

[Chang, Rebecca Swee Fun]

Hi Darren,

I would take in your suggestion. However, this GPIO config would be Baytrail specific config and we will have PWM config in future release which also Baytrail specific.

So, I would propose that we will put all these baytrail specific configs in linux-yocto-3.8/meta/cfg/kernel-cache/features/embedded-io-byt/.
So you have any comment on this?

As for switching to reuse the common-pc/base and common-pc-64/base branches, Yes, we can switch to that branch. 

Thanks.

> -----Original Message-----
> From: Darren Hart [mailto:dvhart at linux.intel.com]
> Sent: 26 September, 2013 4:59 AM
> To: Chang, Rebecca Swee Fun
> Cc: Development list for the linux-yocto*.git Linux kernel repositories
> Subject: Re: [linux-yocto] [PATCH 1/1] meta: add baytrail scc & config files
> 
> On Wed, 2013-09-25 at 03:23 +0000, Chang, Rebecca Swee Fun wrote:
> > Hi Darren,
> >
> > Please see my replies below.
> >
> 
> Rebecca - great, this all looks good to me. Just one comment:
> 
> 
> > >
> > > > +
> > > > +CONFIG_GPIOLIB=y
> > > > +CONFIG_GPIO_BYT=y
> > > > +CONFIG_GPIO_BYT_DEVICE=y
> > > > +
> > >
> > >
> > > GPIO_BYT* configs do not exist in the sources nor do they exist in
> > > the upstream kernel.
> >
> > We will have internal discussion regarding this.
> > For Darren, please refer to Ong Boon Leong's email reply in the internal
> review email thread. He will comment on this.
> >
> 
> So after reading BL's email and learning a bit more about the two types of
> device enumeration and the IVI dependence on the PCI-variant, we can
> make this work.
> 
> Given that these config options require a set of out-of-tree drivers, my
> recommendation would be to treat these as we do the emgd driver. They
> can go in a feature branch and have a feature config fragment associated
> with them which merges in that branch when included in the machine scc.
> 
> linux-yocto-3.8/meta/cfg/kernel-cache/features/drm-emgd [meta] $ cat
> drm-emgd-1.18.scc kconf hardware drm-emgd.cfg merge emgd-1.18
> 
> With this in place, you will not need a dedicated machine branch for the
> baytrail and can reuse the common-pc/base and common-pc-64/base
> branches, reducing the branch maintenance imposed on linux-yocto and
> working toward consolidating IA BSPs to fewer branches.
> 
> Do you have any concerns with being able to move forward in a timely
> manner with this approach? It involves a bit of refactoring, but nothing major,
> and I can help out if any aspect of it is new or unclear.
> 
> --
> Darren Hart
> Intel Open Source Technology Center
> Yocto Project - Linux Kernel
>