Nori, Sekhar <nsek...@ti.com> writes: > Update the clock framework for dynamic CPU frequency change. > > clk_round_rate, clk_set_rate have been updated to handle dynamic frequency > changes. > > davinci_set_pllrate() changes the PLL rate of a given PLL. This function > has been presented as a generic function though it has been tested only > on OMAP-L138 EVM. No other currently available DaVinci device will probably > use this function, but any future device specific changes will hopefully be > small enough to get taken care using a cpu_is_xxx() macro. > > The clk_set_parent() API is implemented to reparent clocks to > asynchronous domains where possible and insulate them from frequency > changes. > > An inline function is introduced to get to the parent PLL of a given > clock. This is useful in finding out all the clocks which gets > affected by a PLL rate change. > > Finally, another function is implemented to recalculate the PLL derived > rates after the PLL rate has been changed. > > Tested on OMAP-L138 EVM. > > Signed-off-by: Sekhar Nori <nsek...@ti.com>
Looks pretty good, minor comment below. And would also be nice to at least boot test on one of the DM* boards. > --- > arch/arm/mach-davinci/clock.c | 140 ++++++++++++++++++++++++++++++++++++++++- > arch/arm/mach-davinci/clock.h | 18 +++++ > 2 files changed, 155 insertions(+), 3 deletions(-) > > diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c > index 83d54d5..5cbb95e 100644 > --- a/arch/arm/mach-davinci/clock.c > +++ b/arch/arm/mach-davinci/clock.c > @@ -19,6 +19,7 @@ > #include <linux/mutex.h> > #include <linux/platform_device.h> > #include <linux/io.h> > +#include <linux/delay.h> > > #include <mach/hardware.h> > > @@ -99,20 +100,50 @@ long clk_round_rate(struct clk *clk, unsigned long rate) > if (clk == NULL || IS_ERR(clk)) > return -EINVAL; > > + if (clk->round_rate) > + return clk->round_rate(clk, rate); > + > return clk->rate; > } > EXPORT_SYMBOL(clk_round_rate); > > int clk_set_rate(struct clk *clk, unsigned long rate) > { > + unsigned long flags; > + int ret = -EINVAL; > + > if (clk == NULL || IS_ERR(clk)) > - return -EINVAL; > + return ret; should probably also check for a non-NULL clk->set_rate here since it's only defined for da850 currently. Kevin _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source