From a093bde2b45a0a745f12c018e2d13c027d58641f Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Fri, 31 Aug 2012 14:21:28 +0200 Subject: clk: Provide option for clk_get_rate to issue hw for new rate By using CLK_GET_RATE_NOCACHE flag, we tell the clk_get_rate API to issue the hw for an updated clock rate. This can be used for a clock which rate may be updated without a client necessary modifying it. Signed-off-by: Ulf Hansson Signed-off-by: Mike Turquette --- drivers/clk/clk.c | 43 ++++++++++++++++++++++++------------------- 1 file changed, 24 insertions(+), 19 deletions(-) (limited to 'drivers/clk') diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index efdfd009c270..d9cbae06549f 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -557,25 +557,6 @@ int clk_enable(struct clk *clk) } EXPORT_SYMBOL_GPL(clk_enable); -/** - * clk_get_rate - return the rate of clk - * @clk: the clk whose rate is being returned - * - * Simply returns the cached rate of the clk. Does not query the hardware. If - * clk is NULL then returns 0. - */ -unsigned long clk_get_rate(struct clk *clk) -{ - unsigned long rate; - - mutex_lock(&prepare_lock); - rate = __clk_get_rate(clk); - mutex_unlock(&prepare_lock); - - return rate; -} -EXPORT_SYMBOL_GPL(clk_get_rate); - /** * __clk_round_rate - round the given rate for a clk * @clk: round the rate of this clock @@ -701,6 +682,30 @@ static void __clk_recalc_rates(struct clk *clk, unsigned long msg) __clk_recalc_rates(child, msg); } +/** + * clk_get_rate - return the rate of clk + * @clk: the clk whose rate is being returned + * + * Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag + * is set, which means a recalc_rate will be issued. + * If clk is NULL then returns 0. + */ +unsigned long clk_get_rate(struct clk *clk) +{ + unsigned long rate; + + mutex_lock(&prepare_lock); + + if (clk && (clk->flags & CLK_GET_RATE_NOCACHE)) + __clk_recalc_rates(clk, 0); + + rate = __clk_get_rate(clk); + mutex_unlock(&prepare_lock); + + return rate; +} +EXPORT_SYMBOL_GPL(clk_get_rate); + /** * __clk_speculate_rates * @clk: first clk in the subtree -- cgit v1.2.3