linux-kernel - Re: [PATCH v4 4/4] ARM: dts: Add exynos5250-spring device tree

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Message-ID: <53DAD1C6.9070102@suse.de>
Date:	Fri, 01 Aug 2014 01:31:18 +0200
From:	Andreas Färber <afaerber@...e.de>
To:	Tomasz Figa <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org
CC:	Vincent Palatin <vpalatin@...omium.org>,
	Doug Anderson <dianders@...omium.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Stephan van Schaik <stephan@...khronix.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] ARM: dts: Add exynos5250-spring device tree

Am 01.08.2014 01:26, schrieb Tomasz Figa:
> On 01.08.2014 01:17, Andreas Färber wrote:
>> Am 31.07.2014 21:40, schrieb Tomasz Figa:
>>> On 31.07.2014 21:20, Andreas Färber wrote:
>>>> Am 31.07.2014 21:05, schrieb Tomasz Figa:
>>>>> On 31.07.2014 18:08, Andreas Färber wrote:
> [snip]
>>>>>> +&dp_hpd {
>>>>>> +	samsung,pins = "gpc3-0";
>>>>>> +	samsung,pin-function = <0>;
>>>>>> +	samsung,pin-pud = <3>;
>>>>>> +	samsung,pin-drv = <0>;
>>>>>> +};
>>>>>
>>>>> Hmm, what node is this referencing? I believe this should rather
>>>>> reference the pin controller and add a new board-specific pinconf/pinmux
>>>>> group instead....
>>>>
>>>> It's a -pinctrl node. See v3->v4 change log and discussion on v3.
>>>>
>>>
>>> Well, this is clearly a board specific node anyway, because it does not
>>> refer to a special function, but simply an input/interrupt GPIO. If it
>>> somehow has landed in generic pinctrl dtsi then it should be removed
>>> from there and this patch should simply introduce its own instance of
>>> dp_hpd node, so you did the right thing in v3.
>>
>> Well, my point was that the 3.8 tree contains only one dp-hpd node, not
>> two as we would get by adding a new node here.
>>
>> Apart from Spring, it's used in Snow and SMDK5250, so moving it there
>> seems feasible and the cleanest solution to me.
>>
> 
> What I mean is that in exynos5250-pinctrl.dtsi only generic SoC pin
> groups should be defined and those more or less correspond to groups
> with samsung,pin-function set to something other than 0 (input) or 1
> (output). Now here hpd_gpio is just a normal GPIO input used as
> interrupt source to detect when a cable is plugged or unplugged. This is
> by no means generic to the SoC, because any GPIO with interrupt
> capability can be used for this purpose. This means that the whole
> pin{conf,mux} group should be defined on board level.

Exactly what I meant! :)

Andreas

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