Re: [PATCH] gpio: dt-bindings: document the concept of GPIO banks

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Thu, Mar 31, 2016 at 4:52 PM, Neil Armstrong <narmstrong@xxxxxxxxxxxx> wrote:
> On 03/31/2016 04:48 PM, Rob Herring wrote:

>>>> We generally avoid indexing blocks in DT.
>>
>> Which is a global number space that might not work in all cases. I
>> don't think gpio should be using aliases either. If you need to
>> describe the connections between nodes, then keep that between nodes.
>
> Couldn't we use gpio-ranges ?

GPIO ranges are normally for cross-referencing GPIO blocks to
pin controllers but in essence, yes we *could*.

But what people will do is to use that backwards to calculate
the bank ID.

They would just get the GPIO base offset from the
range and /32 to get the bank ID. All over the place...
Also for GPIO controllers without pin control back-ends.

Yours,
Linus Walleij
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