linux-kernel - Re: [PATCH v3 12/18] dt-bindings: Add PLX Technology OXNAS pinctrl and gpio bindings

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Date:	Thu, 31 Mar 2016 08:36:23 -0500
From:	Rob Herring <robh@...nel.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Neil Armstrong <narmstrong@...libre.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 12/18] dt-bindings: Add PLX Technology OXNAS pinctrl
 and gpio bindings

On Thu, Mar 31, 2016 at 3:58 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Fri, Mar 25, 2016 at 3:48 PM, Rob Herring <robh@...nel.org> wrote:
>> On Thu, Mar 24, 2016 at 05:50:09PM +0100, Neil Armstrong wrote:
>>> Add pinctrl and gpio DT bindings for PLX Technology OXNAS SoC Family.
>>> This version supports the ARM926EJ-S based OX810SE SoC with 34 IO pins.
>>>
>>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>
>>> + - plxtech,gpio-bank: Specifies which bank a controller owns.
>>
>> How is this used?
>
> That is used to give a unique ID number to the bank.
>
> Hardware often need this to cross-reference pin controllers
> to GPIO banks.
>
> I should add it as "gpio-bank" to the generic bindings
> instead, several platforms already use this and there is
> no point in having a vendor prefix in front of it.

Okay, now it is clearer. I don't want this documented as a common
property because I don't want to encourage it's use. I only see 2
users currently: ST and PIC32.

Looking at one example, it appears to be redundant already.
nomadik-gpio-chips property already gives you the index. The index of
the phandles is the bank numbering. PIC32 could do the same.

Rob