Re: [PATCH v2 1/2] dt-bindings: reset: Add bindings for basic reset controller

From: Joel Stanley
Date: Mon Jul 03 2017 - 02:51:55 EST

On Thu, Jun 8, 2017 at 6:19 AM, Rob Herring <robh@xxxxxxxxxx> wrote:
> On Tue, May 30, 2017 at 03:38:50PM +0930, Joel Stanley wrote:
>> This adds the bindings documentation for a basic single-register reset
>> controller.
>> The bindings describe a single 32-bit register that contains up to 32
>> reset lines, each deasserted by clearing the appropriate bit in the
>> register. Optionally a property can be provided that changes this
>> behaviour to assert on clear.
> I think this is a good idea for kernel code, but not for bindings. We
> don't really want per register bindings.
> The problem with any generic/simple/basic binding is they always start
> that way. Then we add one property at a time not in any well planned
> way. I can easily come up with additions. For example, what about
> self-clearing reset bits. Or 2 bits per reset. Or multiple resets that
> have to be controlled together. 8 or 16-bit registers.

Thanks for the explanation. I will send a v3 with aspeed specific bindings.

How should I handle the driver? Were you suggesting I keep it generic,
but with my aspeed compatible?



> IRQs and GPIOs could also be described in some cases with just groups of
> 32-bit registers for set,clear,status,mask,etc., but we don't do that in
> bindings for the same reasons.
> Rob