linux-kernel - Re: Arm sub architectures missing clk_round

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Message-ID: <51B2FA44.4020100@jic23.retrosnub.co.uk>
Date:	Sat, 08 Jun 2013 10:32:52 +0100
From:	Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Jonathan Cameron <jic23@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	"Hennerich, Michael" <Michael.Hennerich@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Eric Miao <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>
Subject: Re: Arm sub architectures missing clk_round_rate()

cc'd Eric and Haojian, sorry should have done that in the first place.

On 06/08/2013 10:21 AM, Russell King - ARM Linux wrote:
> On Sat, Jun 08, 2013 at 09:57:17AM +0100, Jonathan Cameron wrote:
>> At least one Arm subarch (pxa) does no provide an implementation of this
>> function.  As far as I can see there is no way for a driver wishing to use
>> it to detect it's absence.  This is marked in clk.h as being optional
>> for 'Machine Class support'. Obvious solutions to this are:
>>
>> 1) It is effectively only usable by platform specific drivers as no
>>    more generic driver can know it is available.  Perhaps even a stub that
>>    returns an appropriate error would be acceptable.
>>
>> 2) It is not as optional as the header implies and should always be implemented
>>    if the rest of the clk framework is.
>>
>> 3) There should be some means of detecting its absense so that drivers can
>>    be dependant on its presene.
>>
>> Which is the correct one?
> The right answer is (2) now that we have things like the clk framework and
> soo many users.
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