linux-kernel - Re: [PATCH 1/3] PWM: add pwm framework support

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Date:	Wed, 14 Dec 2011 11:03:38 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Arnd Bergmann <arnd@...db.de>, Ryan Mallon <rmallon@...il.com>,
	Bill Gatliff <bgat@...lgatliff.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	viresh kumar <viresh.kumar@...com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Ryan Mallon <ryan@...ewatersys.com>
Subject: Re: [PATCH 1/3] PWM: add pwm framework support

* Sascha Hauer wrote:
> I have a branch which adds a basic PWM framework. It doesn't change the
> pwm API at all, but only adds support for registering multiple PWM
> drivers. All in Kernel drivers are converted to this new framework, but
> except the i.MX driver all of them are untested. I'm quite confident
> that the drivers itself work, but there will probably be some Kconfig
> related issues which I wasn't able to sort out. The corresponding
> Maintainers should probably have a look over it. Feel free to post
> the patches if you are prepared to work on the comments you receive.
> Otherwise I'll see if I find some time maybe next week.
[...]

I've looked at this in more detail and one thing that irritates me is that
the current driver API requires a driver to register a pwm_chip structure for
each PWM it can control. Wouldn't it be easier in such cases to just specify
how many PWMs a chip wants to register, much like gpiolib does it?

Thierry

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