diff options
| author | Stephen Boyd <sboyd@codeaurora.org> | 2014-09-05 15:47:25 -0700 |
|---|---|---|
| committer | Andrey Konovalov <andrey.konovalov@linaro.org> | 2015-01-13 17:56:44 +0300 |
| commit | 200bb9ea0dea68ff59fbb15e797c1d036419fb86 (patch) | |
| tree | 66a146b442d8970abeb090c92460ae88210dc60e /include | |
| parent | 7ab71a60ee0ccba3a42538f2c67ad786a4d43831 (diff) | |
clk: Add safe switch hook
Sometimes clocks can't accept their parent source turning off
while the source is reprogrammed to a different rate. Most
notably some CPU clocks require a way to switch away from the
current PLL they're running on, reprogram that PLL to a new rate,
and then switch back to the PLL with the new rate once they're
done. Add a hook that drivers can implement allowing them to
return a 'safe parent' that they can switch their parent to while
the upstream source is reprogrammed.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/clk-private.h | 2 | ||||
| -rw-r--r-- | include/linux/clk-provider.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/clk-private.h b/include/linux/clk-private.h index 0ca5f6046920..681c6e0aa42c 100644 --- a/include/linux/clk-private.h +++ b/include/linux/clk-private.h @@ -38,8 +38,10 @@ struct clk { struct clk **parents; u8 num_parents; u8 new_parent_index; + u8 safe_parent_index; unsigned long rate; unsigned long new_rate; + struct clk *safe_parent; struct clk *new_parent; struct clk *new_child; unsigned long flags; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 01d02c7fb6bf..0f792e720546 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -179,6 +179,7 @@ struct clk_ops { struct clk_hw **best_parent_hw); int (*set_parent)(struct clk_hw *hw, u8 index); u8 (*get_parent)(struct clk_hw *hw); + struct clk *(*get_safe_parent)(struct clk_hw *hw); int (*set_rate)(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate); int (*set_rate_and_parent)(struct clk_hw *hw, |