linux-kernel - Re: [PATCH v4] clk: si570: Add a driver for SI570 oscillators

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Message-ID: <65b27409-d70f-41d2-ace5-9c3fe65ec24d@CO9EHSMHS003.ehs.local>
Date:	Fri, 20 Sep 2013 14:53:08 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Mike Turquette <mturquette@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Joe Perches <joe@...ches.com>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Hyun Kwon <hyunk@...inx.com>
Subject: Re: [PATCH v4] clk: si570: Add a driver for SI570 oscillators

On Fri, Sep 20, 2013 at 11:15:29AM -0700, Guenter Roeck wrote:
> On Fri, Sep 20, 2013 at 10:39:17AM -0700, Soren Brinkmann wrote:
[...]
> > diff --git a/drivers/clk/clk-si570.c b/drivers/clk/clk-si570.c
> > new file mode 100644
> > index 0000000..13c2091
> > --- /dev/null
> > +++ b/drivers/clk/clk-si570.c
[...]
> > +static int si570_probe(struct i2c_client *client,
[...]
> > +	/* Read the requested initial output frequency from device tree */
> > +	if (!of_property_read_u32(client->dev.of_node, "clock-frequency",
> > +				&initial_fout)) {
> > +		err = clk_set_rate(clk, initial_fout);
> > +		if (err) {
> > +			of_clk_del_provider(client->dev.of_node);
> > +			clk_unregister(data->hw.clk);
> 
> Is that needed ? I would have thought it isn't because you use a devm_ function
> to register it.
> 
> Not that I understand the clk code, but getting clk from the registration
> function and unregistering hw.clk (without seting it) sems a bit odd.
> Is it well defined that you have to unregister hw.clk ?
You're absolutely right. I'll remove all calls to clk_unregister().
Thanks for finding that one.

	Sören


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