[PATCH] ARM: mx28: Clear CLKGATE bit prior to changing DIV field

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Thu, Jan 19, 2012 at 11:17:34AM +0800, Shawn Guo wrote:
> >From power saving point of view, I'm not sure you want to keep saif
> clock on all the time.  So if the clock is off when you try to call
> clk_set_rate(), you may want to turn it back to off after clk_set_rate()
> is done.

You really shouldn't expose these kinds of SoC specific oddities outside
of the API - it makes a mockery of having an API in the first place.

Can you not do:

clk_set_rate(clk, rate)
{
	clk_prepare(clk);

	reprogram_clock(clk);

	clk_unprepare(clk);
}

A clk_prepare() call on an already prepared clock should have no impact
other than incrementing the counter, which will be balanced on the other
side by the clk_unprepare().