[PATCH 00/12] of: overlay: clean up device tree overlay code

[Tomi Valkeinen]


Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

On 04/10/17 17:56, Rob Herring wrote:
> On Mon, Oct 2, 2017 at 10:53 PM,  <frowand.list at gmail.com> wrote:
>> From: Frank Rowand <frank.rowand at sony.com>
>>
>> I have found the device tree overlay code to be difficult to read and
>> maintain.  This patch series attempts to improve that situation.
>>
>> The cleanup includes some changes visible to users of overlays.  The
>> only in kernel user of overlays is fixed up for those changes.  The
>> in kernel user is:
>>
>>    drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c
> 
> At what point can we remove this? I'm assuming at some point users
> will need to update their dtb's for other reasons and this becomes
> obsolete.

To be honest, I have no idea, or how to find that out.

Do we need to get rid of it? Afaik, we haven't do much (or any?)
maintenance on tilcdc_slave_compat.c since it was written, so from our
perspective it's been a minimal burden. Is it creating burden for others?

Is the approach done with tilcdc_slave_compat.c something that's not
recommended? I'm sure similar situations happen with other drivers too,
and I think it's a good idea to have a recommended way of keeping
compatibility.

 Tomi