ARM: 7211/1: smp_twd: get the rate from a clock
This break-out from Colin Cross' cpufreq-aware TWD patch will optionally retrieve the clock rate of the TWD from an external clock. A variant of this patch has been proposed by Rob Herring as well. The basic idea is to avoid recalibrating the rate of the clock at boot if the platform already know what rate the clock to the TWD block has. ChangeLog v1->v2: added clk_[prepare|unprepare] calls. [Broke out of larger SMP TWD patch] Signed-off-by: NColin Cross <ccross@android.com> Acked-by: NThomas Gleixner <tglx@linutronix.de> Acked-by: NRob Herring <rob.herring@calxeda.com> Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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