linux-kernel - Re: Pinmux bindings proposal V2

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Message-ID: <20120131010708.GA24681@S2101-09.ap.freescale.net>
Date:	Tue, 31 Jan 2012 09:07:11 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"Linus Walleij (linus.walleij@...aro.org)" <linus.walleij@...aro.org>,
	"Sascha Hauer (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>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	"Grant Likely (grant.likely@...retlab.ca)" 
	<grant.likely@...retlab.ca>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Pinmux bindings proposal V2

On Mon, Jan 30, 2012 at 09:43:23AM -0800, Tony Lindgren wrote:
> * Shawn Guo <shawn.guo@...aro.org> [120129 17:27]:
> > On Fri, Jan 27, 2012 at 09:16:53AM -0800, Tony Lindgren wrote:
> > ...
> > > I guess the analog we should follow here is clk_get and clk_set_rate,
> > > except we would have pinconf_set_state with predefined states.
> > > 
> > It seems working for cases that we only change pinconf but never pinmux
> > for different configuration states.  But how would that work for cases
> > that require mux change for different configuration states?
> 
> I don't see why we should not allow changing the mux state with pinconf
> too, after all it's the mux/pin that's locked, not the functionality of
> the pin.
> 
My point is I do not see how we can use the current pinmux APIs design
to change mux in the way how clk_get and clk_set_rate work.  Or you
have a pinmux APIs reconstruction on your mind?

Regards,
Shawn

> An example of this would be remuxing a shared UART line between rx and
> tx. Those kind of cases could be defined as PMX_DIRECTION_INPUT and
> PMX_DIRECTION_OUTPUT so driver could call Linux generic functions for
> those if implemented.
> 
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