linux-kernel - Re: [PATCH 4/4] clk: wm831x: Add initial WM831x clock driver

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Date:	Thu, 22 Mar 2012 12:26:13 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] clk: wm831x: Add initial WM831x clock driver

On Thu, Mar 22, 2012 at 11:15:31AM +0000, Mark Brown wrote:
> On Wed, Mar 21, 2012 at 11:26:22PM +0100, Sascha Hauer wrote:
> > On Wed, Mar 21, 2012 at 08:01:22PM +0000, Mark Brown wrote:
> 
> > > +	if (!clk_register(&pdev->dev, "xtal", &wm831x_xtal_ops,
> > > +			  &clkdata->xtal_hw, NULL, 0, CLK_IS_ROOT))
> > > +		return -EINVAL;
> 
> > The clock names are unique identifiers for the clock, so clocks in
> > drivers should probably have dev_name encoded into them.
> 
> No, that's not sensible.  We shouldn't be open coding this into each
> individual driver that provides clocks, and we shouldn't have clock
> users having to guess at what scheme the driver author used to dedupe
> the clocks.  As a driver author you would assume that the reason we're
> providing the struct device to the registration function in the first
> place is so that the core has the information it needs to do that.
> 
> I did provide patches to do what you suggest in the core for one of the
> earlier versions of the API, I have to say I didn't check to see if they
> got dropped during the general lulls.

It seems they got dropped. Currently the clock framework does nothing
with the device argument. But right, it could use this argument to
generate a suitable name.

Sascha

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