linux-kernel - Re: [PATCH v4] clk: add si5351 i2c common clock driver

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Date:	Wed, 3 Apr 2013 13:10:52 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	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>,
	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: [PATCH v4] clk: add si5351 i2c common clock driver

On Wed, Apr 3, 2013 at 1:46 AM, Mike Turquette <mturquette@...aro.org> wrote:
> Quoting Sebastian Hesselbarth (2013-03-23 07:46:50)
>> diff --git a/drivers/clk/clk-si5351.c b/drivers/clk/clk-si5351.c
>> new file mode 100644
>> index 0000000..9d0c210
>> --- /dev/null
>> +++ b/drivers/clk/clk-si5351.c
>> @@ -0,0 +1,1411 @@
>> +/*
>> + * clk-si5351.c: Silicon Laboratories Si5351A/B/C I2C Clock Generator
>> + *
>> + * Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
>> + * Rabeeh Khoury <rabeeh@...id-run.com>
>> + *
>> + * References:
>> + * [1] "Si5351A/B/C Data Sheet"
>> + *     http://www.silabs.com/Support%20Documents/TechnicalDocs/Si5351.pdf
>> + * [2] "Manually Generating an Si5351 Register Map"
>> + *     http://www.silabs.com/Support%20Documents/TechnicalDocs/AN619.pdf
>> + *
>> + * This program is free software; you can redistribute  it and/or modify it
>> + * under  the terms of  the GNU General  Public License as published by the
>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>> + * option) any later version.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/kernel.h>
>> +#include <linux/clk-private.h>
>
> I hope that this is supposed to be clk-provider.h.  I don't plan on
> taking in any more clock drivers that depend on clk-private.h.  I didn't
> see any reason for this patch to not use clk-provider.h.

True except for two things:
- The driver sets clk flags for the hierarchy after parsing the DT and
there is no helper __clk_set_flags()
- For single parent clks (pxtal, pclkin) I reuse &clk->name for .parent_names

For the latter I would have to add two static char *[1] somewhere, not
a big deal. But the for the flags,
I guess there will be no __clk_set_flags helper? Then I'd have to
parse the DT in advance to have the
correct flags ready at clk registration.

Sebastian
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