Re: [PATCH 1/2] dt-bindings: GPIO: Add generic serializer binding

[Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

On Tue, Dec 15, 2015 at 12:19 AM, Andrew F. Davis <afd-l0cyMroinI0@public.gmane.org> wrote:
> [Rob]
>> I agree the generic version is fine (or find who made the first part
>> ;)). What "pisosr" is is not very obvious though. Having 74165 in the
>> compatible would make it somewhat more obvious it is a standard logic
>> part.
>>
>
> A quick search shows shift-registers being made from vacuum tubes for
> the Colossus! Those might work with this driver if you could match the
> voltage to an SPI bus... :)
>
> I agree about the name not being very good, but I'm not sure about
> 74165 ether as it is also just a single part number.

We can add many compatible strings so it's not an issue.
"ti,74165" works for me as TI invented the 74xx series.

> The idea was to
> have a non-part number compatible string for any shift-register you
> can hook to the SPI line.

Again, one does not exclude the other. I'm happy with a generic
compatible *and* "ti,74165".

> That way when we have boards with a sn65x882
> or something we wont have to call it a 74165. But I guess that's why
> it's a "compatible:" string, and not "is-a:" string.

Compatible ranges from the specific to the more generic
so compatible = "ti,74165", "pisosr"; is just fine. Something
will match if there is a suitable driver. The OS may choose to
provide something part-specific or something more generic.

Yours,
Linus Walleij
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