Re: [Patch v2] driver/clk/clk-si5338: Add common clock framework driver for si5338

From: York Sun
Date: Tue Jun 16 2015 - 11:38:36 EST

On 06/16/2015 08:18 AM, York Sun wrote:
> Paul,
> Thanks for reviewing.
> On 06/16/2015 01:21 AM, Paul Bolle wrote:
>> One question and a few nits follow.
>> On Mon, 2015-06-15 at 10:07 -0700, York Sun wrote:
>>> SI5338 is a programmable clock generator. It has 4 sets of inputs,
>>> PLL, multisynth and dividers to make 4 outputs. This driver splits
>>> them into multiple clocks to comply with common clock framework.
>>> See Documentation/devicetree/bindings/clock/silabs,si5338.txt for
>>> details.
>>> Signed-off-by: York Sun <yorksun@xxxxxxxxxxxxx>
>>> CC: Mike Turquette <mturquette@xxxxxxxxxx>
>> Apparently that's now mturquette@xxxxxxxxxxxx .
> Thanks. Will change.
>>> CC: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
>>> CC: Guenter Roeck <linux@xxxxxxxxxxxx>
>>> CC: Andrey Filippov <andrey@xxxxxxxxxx>
>>> --- a/drivers/clk/Kconfig
>>> +++ b/drivers/clk/Kconfig
>>> config COMMON_CLK
>>> - bool
>>> + tristate "Common Clock"
>>> select CLKDEV_LOOKUP
>>> select SRCU
>> Why? The commit explanation doesn't mention this. Did you use an unclean
>> tree? If not, you just created over a dozen of new modules:
> Thanks for catching this. I was testing building the driver within and outside
> of kernel tree for another kernel version. If this driver is built-in, I don't
> need to make it tristate. Will revert in next version.

Now I remember why I did this. COMMON_CLK wasn't an option users can select,
because it is a bool and only selected by some platforms. I think it should be a
tristate so one can build a driver with it. When it is selected, some drivers
are built, either into kernel or as modules, up to user's choice. They are
needed by common clock framework.

I should add explanation in commit message. Or separate it into an individual
patch. Which one is preferred?

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