linux-kernel - Re: gpio-pxa: getting GPIOs by devicetree phandle broken

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Date:	Mon, 09 Feb 2015 09:02:51 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Tyler Hall <tylerwhall@...il.com>,
	"linux-gpio\@vger.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	Daniel Mack <zonque@...il.com>,
	Hans Holmberg <hans.holmberg@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Howard Cochran <cochran@...mark.com>
Subject: Re: gpio-pxa: getting GPIOs by devicetree phandle broken

Alexandre Courbot <gnurou@...il.com> writes:

> Adding Robert who reported the same thing.
>
> On Sat, Feb 7, 2015 at 6:28 AM, Tyler Hall <tylerwhall@...il.com> wrote:
>> 1. Require child nodes in DT for each bank
>
> This would break DT compatibility.
Agreed.

>
>> 2. Refactor gpio-pxa to only register one gpiochip
>
> Sounds better, especially since this would reflect the hardware more
> accurately. One DT node should translate into one GPIO chip.
Could I know where "should translate into _one_ GPIO chip" comes from ? Is it a
specification, or is it a new rule we're creating ?

And if it's a new rule, I'd like to know what backs it up .

> problem is that I'm afraid several other drivers are doing the same
> thing and thus are now similarly broken.
That's also what I'm afraid of.

> The following is also likely to work as a workaround, but I would not
> go as far as saying this should be taken as a fix. Hans, since you
> wrote 7b8792b, could we have your input on this?
I was going to suggest the very same approach. If this one (or a similar one)
doesn't meet success, then my weekend of revert queries is not over ... and I
don't like reverts.

Cheers.

-- 
Robert
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