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:

quoted

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.