linux-kernel - Re: [PATCH V3 2/4] drivers/i2c/busses/i2c-at91.c: add new driver

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Message-ID: <20111109191136.GP12913@n2100.arm.linux.org.uk>
Date:	Wed, 9 Nov 2011 19:11:36 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	"Voss, Nikolaus" <N.Voss@...nmann.de>
Cc:	'Ryan Mallon' <rmallon@...il.com>,
	"'nicolas.ferre@...el.com'" <nicolas.ferre@...el.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'balbi@...com'" <balbi@...com>,
	"'linux-i2c@...r.kernel.org'" <linux-i2c@...r.kernel.org>,
	"'ben-linux@...ff.org'" <ben-linux@...ff.org>,
	"'khali@...ux-fr.org'" <khali@...ux-fr.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V3 2/4] drivers/i2c/busses/i2c-at91.c: add new driver

On Wed, Nov 09, 2011 at 05:01:07PM +0100, Voss, Nikolaus wrote:
> Hi Ryan,
> > 
> > > +	dev->irq = irq->start;
> > > +	platform_set_drvdata(pdev, dev);
> > > +
> > > +	dev->clk = clk_get(&pdev->dev, "twi_clk");
> > 
> > 
> > This didn't get answered. Can't you just do:
> > 
> > 	dev->clk = clk_get(&pdev->dev, NULL);
> > 
> > and clkdev should figure out the correct clock based on the device pointer?
> 
> No, this doesn't work on at91 since the clocks have no dev_id property
> but only con_id. I cannot see a reason for this, but that's the way it's
> done. Multiple hardware interfaces are handled via a lookup table.

If you can, you could move over to doing this via the standard method
and start switching some of this stuff over to using dev_id.

We'll then have another platform starting to use this stuff correctly.
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