Messages in this thread |  | | | Date | Wed, 30 May 2012 14:58:23 +0530 | | From | Rajendra Nayak <> | | Subject | Re: [RFC PATCH] clk: add extension API |
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Hi Peter,
On Tuesday 29 May 2012 03:28 PM, Peter De Schrijver wrote: > Add an extension API for clocks. This allows clocktypes to provide extensions > for features which are uncommon and cannot be easily mapped onto normal clock > framework concecpts. eg: resetting blocks, configuring clock phase etc.
I was thinking on similar lines for OMAP wherein I need to control 'hardware-auto-gating' bits on clocks which are otherwise just normal gates or dividers. We just disable all of them early at boot and re-enable them late in the boot process once PM kicks in.
regards, Rajendra
> > Signed-off-by: Peter De Schrijver<pdeschrijver@nvidia.com> > --- > drivers/clk/clk.c | 8 ++++++++ > include/linux/clk-provider.h | 2 ++ > include/linux/clk.h | 2 ++ > 3 files changed, 12 insertions(+), 0 deletions(-) > > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c > index e5d5dc1..39bc458 100644 > --- a/drivers/clk/clk.c > +++ b/drivers/clk/clk.c > @@ -956,6 +956,14 @@ struct clk *clk_get_parent(struct clk *clk) > } > EXPORT_SYMBOL_GPL(clk_get_parent); > > +int clk_ext(struct clk *clk, unsigned int op, unsigned long param) > +{ > + if (clk->ops->ext) > + return clk->ops->ext(clk->hw, op, param); > + > + return -EINVAL; > +} > + > /* > * .get_parent is mandatory for clocks with multiple possible parents. It is > * optional for single-parent clocks. Always call .get_parent if it is > diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h > index 6803fb4..08025d3 100644 > --- a/include/linux/clk-provider.h > +++ b/include/linux/clk-provider.h > @@ -109,6 +109,8 @@ struct clk_ops { > int (*set_rate)(struct clk_hw *hw, unsigned long, > unsigned long); > void (*init)(struct clk_hw *hw); > + int (*ext)(struct clk_hw *hw, unsigned int op, > + unsigned long param); > }; > > /** > diff --git a/include/linux/clk.h b/include/linux/clk.h > index 0e078bd..74be656 100644 > --- a/include/linux/clk.h > +++ b/include/linux/clk.h > @@ -278,4 +278,6 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id); > int clk_add_alias(const char *alias, const char *alias_dev_name, char *id, > struct device *dev); > > +int clk_ext(struct clk *clk, unsigned int op, unsigned long param); > + > #endif
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