linux-kernel - Re: [v5] clk: add si5351 i2c common clock driver

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Message-ID: <51625F9A.1050308@gmail.com>
Date:	Mon, 08 Apr 2013 08:11:38 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Dom Cobley <popcornmix@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rabeeh Khoury <rabeeh@...id-run.com>,
	Daniel Mack <zonque@...il.com>,
	Jean-Francois Moine <moinejf@...e.fr>,
	Lars-Peter Clausen <lars@...afoo.de>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [v5] clk: add si5351 i2c common clock driver

On 04/08/2013 02:17 AM, Guenter Roeck wrote:
> On Mon, Apr 08, 2013 at 01:49:24AM +0200, Sebastian Hesselbarth wrote:
>> On 04/08/2013 12:50 AM, Guenter Roeck wrote:
>>> On Fri, Apr 05, 2013 at 05:23:35AM -0000, Sebastian Hesselbarth wrote:
>>>> This patch adds a common clock driver for Silicon Labs Si5351a/b/c
>>>> i2c programmable clock generators. Currently, the driver supports
>>>> DT kernels only and VXCO feature of si5351b is not implemented. DT
>>>> bindings selectively allow to overwrite stored Si5351 configuration
>>>> which is very helpful for clock generators with empty eeprom
>>>> configuration. Corresponding device tree binding documentation is
>>>> also added.
>>>>
>>>> Signed-off-by: Sebastian Hesselbarth<sebastian.hesselbarth@...il.com>
>>>> Tested-by: Daniel Mack<zonque@...il.com>
>>>>
>>> [ ... ]
>>>
>>>> +static inline void _si5351_msynth_set_pll_master(
>>>> +	struct si5351_driver_data *drvdata, unsigned char num, int is_master)
>>>> +{
>>>> +	unsigned long flags;
>>>> +
>>>> +	if (num>   8 ||
>>>> +	    (drvdata->variant == SI5351_VARIANT_A3&&   num>   3))
>>>> +		return;
>>>> +
>>>> +	flags = __clk_get_flags(drvdata->msynth[num].hw.clk);
>>>> +	if (is_master)
>>>> +		flags |= CLK_SET_RATE_PARENT;
>>>> +	else
>>>> +		flags&= ~CLK_SET_RATE_PARENT;
>>>> +	__clk_set_flags(drvdata->msynth[num].hw.clk, flags);
>>>> +}
>>>> +
>>> Unless I am missing something, neither __clk_get_flags() nor the new
>>> __clk_set_flags is exported.
>>>
>>> Did you try to build and load the driver as module ?
>>
>> Well, good catch. I didn't try to build v5 as a module, but I guess it
>> will fail. But I consider this as something that has to be addressed in
>> clk framework itself, not in this patch. There will be other
>> clk-providers built as module in the future for sure.
>>
> Sure, but you provided the patch to make __clk_set_flags global. To avoid
> build failures, I would suggest to either submit a patch to export the
> missing functions, or to remove the ability to build the driver as module.

Actually, I knew that __clk_set_flags patch will not be accepted before 
posting it ;)

> On a side note, do you happen to know anyone working on drivers for Si5319 or
> Si5368 ?

No.

> Thanks,
> Guenter

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