linux-kernel - Re: Pinmux bindings proposal

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Message-ID: <20120118044716.GD563@S2101-09.ap.freescale.net>
Date:	Wed, 18 Jan 2012 12:47:18 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Dong Aisheng-B29396 <B29396@...escale.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"Simon Glass (sjg@...omium.org)" <sjg@...omium.org>,
	Dong Aisheng <dongas86@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: Pinmux bindings proposal

On Wed, Jan 18, 2012 at 03:44:59AM +0000, Dong Aisheng-B29396 wrote:
...
> > > The real problem is do we need to support individual pin mux Or still
> > > using virtual pin group?
> > > For the way Stephen proposed, we can only support individual pin mux
> > > Since IMX pins are not grouped together in HW.
> > >
> > I do not see any problem here.  If you look at the first column of 'mux'
> > property of node pinmux-usdhc1, it is a group of pins for usdhc1.
> > Isn't it one virtual pin group for usdhc1?
> > 
> If we treat the whole pins in 'mux' property as a group,
> There may be potential inconsistent issue since Tegra will treat each
> One in the list of 'mux' as a group.
> And it would be a problem for pinctrl core to parse it in a standard way.
> 
Based on my understanding, the 'group' given by 'mux' property may be
a group of pin/group defined by hardware, or mixing of the two.

-- 
Regards,
Shawn
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