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

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Message-ID: <CAL_JsqJS31gNS-dYXQvkLHb=qsVz4Vccztufnd08yfD+p52v_w@mail.gmail.com>
Date:	Fri, 1 Apr 2016 10:19:14 -0500
From:	Rob Herring <robh@...nel.org>
To:	Neil Armstrong <narmstrong@...libre.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	"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 Fri, Apr 1, 2016 at 9:30 AM, Neil Armstrong <narmstrong@...libre.com> wrote:
> On 03/31/2016 03:36 PM, Rob Herring wrote:
>> 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
>>
>
> Hi,
>
> What should I use ?

Maybe gpio-ranges as you asked. Not really sure as I haven't used it.

> I need to repost in a separate patchset with vendor replaced by Oxford Semiconductor.
> Should I get rid of the vendor prefix of gpio-bank ?

No, because I think you should get rid of the property.

Rob