[PATCH 00/10] ARM, arm64: dts: renesas: Use R-Car GPIO Gen[123] fallback compat strings

[Magnus Damm]

Hi Simon,

On Wed, Aug 9, 2017 at 5:22 PM, Simon Horman <horms at verge.net.au> wrote:
> On Wed, Aug 09, 2017 at 09:55:26AM +0200, Simon Horman wrote:
>> On Tue, Aug 08, 2017 at 07:29:28PM +0900, Magnus Damm wrote:
>> > Hi Simon,
>> >
>> > On Tue, Aug 8, 2017 at 5:39 PM, Simon Horman <horms+renesas at verge.net.au> wrote:
>> > > Use newly added R-Car GPIO Gen 1, 2 and 3 fallback compat strings in place
>> > > of now deprecated non-generation specific R-Car GPIO fallback compat string
>> > > in the DT of Renesas ARM and arm64 based SoCs.
>> > >
>> > > This should have no run-time effect as the driver matches against the
>> > > per-SoC compat string before considering the fallback compat string.
>> >
>> > Thanks for your efforts.I have no issue with your series (apart from
>> > the GPIO and SATA mistake), but at the same time I believe the GPIO
>> > hardware itself is backwards compatible between various generations.
>> >
>> > In the nitpick department I would like to point out that the level of
>> > hardware difference between say R-Car Gen1 GPIO and R-Car Gen2 GPIO is
>> > similar to say good old uarts like 8250 and 16450 hardware. Basically
>> > a couple of registers were added to the hardware in a
>> > backwards-compatible way if I recall correctly.
>> >
>> > So if we are going to use "compatible" to point out if hardware is
>> > compatible or not then I would do this instead:
>>
>> Thanks for your feedback.
>>
>> When the generation specific compat strings were recently
>> added the renesas,gpio-rcar compat string was marked as deprecated
>> as I was under the understanding that it was only compatibile with gen 1 SoCs.
>>
>> It now seems that was not the best thing to do and renesas,gpio-rcar should
>> be re-instated as being a generic fallback for all R-Car versions supported
>> in upstream.
>>
>> Do you concur?
>
> I posted a patch to un-deprecate the renesas,gpio-rcar compat string
> in the bindings documentation.
>
> [PATCH] gpio: rcar: reinstate generic compat string

Thanks, this looks good to me. I would like to hear what Geert thinks as well!

Cheers,

/ magnus