linux-kernel - Re: [PATCH 1/2] pwm: Add __weak attributed functions for pwm operations

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Message-ID: <4DD1FCB3.8040700@codeaurora.org>
Date:	Tue, 17 May 2011 10:12:27 +0530
From:	Mohan Pallaka <mpallaka@...eaurora.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.intradead.org, linux-input@...r.kernel.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/2] pwm: Add __weak attributed functions for pwm	operations

  On 5/15/2011 4:28 PM, Russell King - ARM Linux wrote:
> On Sun, May 15, 2011 at 01:00:31AM -0700, Dmitry Torokhov wrote:
>> On Fri, May 13, 2011 at 06:13:21PM +0530, Mohan Pallaka wrote:
>>> For chip drivers that support both pwm and non-pwm modes
>>> would encounter compilation errors if the platform doesn't
>>> have support for pwm though the chip is programmed to work
>>> in non-pwm mode. Add __weak attributed pwm functions to avoid
>>> compilation issues in these scenarios.
>>>
>> Russell,
>>
>> You seem to have authored pwm.h, do you have any objections to this
>> change?
> This seems to be a recipe for an oops.  Have a look at how
> linux/regulator/consumer.h deals with this kind of problem, and notice
> that we have CONFIG_HAVE_PWM to indicate whether this interface is
> supported or not.
Thanks for the suggestion. I'll upload a new patch.

--Mohan.
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