diff options
| author | Emilio López <emilio@elopez.com.ar> | 2013-09-15 04:37:59 +0400 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2013-11-10 14:39:07 +0400 |
| commit | 107f3198fd2c5902b9cc54c86a0c86f815c173e2 (patch) | |
| tree | 60dc1d889efaf68e77b6c18126a99fcc9ae6eff9 /drivers/clk/clk-composite.c | |
| parent | 272b98c6455f00884f0350f775c5342358ebb73f (diff) | |
| download | linux-107f3198fd2c5902b9cc54c86a0c86f815c173e2.tar.xz | |
clk: composite: .determine_rate support
This commit adds .determine_rate support to the composite clock. It will
use the .determine_rate callback from the rate component if available,
and fall back on the mux component otherwise. This allows composite
clocks to enjoy the benefits of automatic clock reparenting.
Signed-off-by: Emilio López <emilio@elopez.com.ar>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Diffstat (limited to 'drivers/clk/clk-composite.c')
| -rw-r--r-- | drivers/clk/clk-composite.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c index a33f46f20a41..753d0b784762 100644 --- a/drivers/clk/clk-composite.c +++ b/drivers/clk/clk-composite.c @@ -55,6 +55,30 @@ static unsigned long clk_composite_recalc_rate(struct clk_hw *hw, return rate_ops->recalc_rate(rate_hw, parent_rate); } +static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *best_parent_rate, + struct clk **best_parent_p) +{ + struct clk_composite *composite = to_clk_composite(hw); + const struct clk_ops *rate_ops = composite->rate_ops; + const struct clk_ops *mux_ops = composite->mux_ops; + struct clk_hw *rate_hw = composite->rate_hw; + struct clk_hw *mux_hw = composite->mux_hw; + + if (rate_hw && rate_ops && rate_ops->determine_rate) { + rate_hw->clk = hw->clk; + return rate_ops->determine_rate(rate_hw, rate, best_parent_rate, + best_parent_p); + } else if (mux_hw && mux_ops && mux_ops->determine_rate) { + mux_hw->clk = hw->clk; + return mux_ops->determine_rate(rate_hw, rate, best_parent_rate, + best_parent_p); + } else { + pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n"); + return 0; + } +} + static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) { @@ -147,6 +171,8 @@ struct clk *clk_register_composite(struct device *dev, const char *name, composite->mux_ops = mux_ops; clk_composite_ops->get_parent = clk_composite_get_parent; clk_composite_ops->set_parent = clk_composite_set_parent; + if (mux_ops->determine_rate) + clk_composite_ops->determine_rate = clk_composite_determine_rate; } if (rate_hw && rate_ops) { @@ -170,6 +196,8 @@ struct clk *clk_register_composite(struct device *dev, const char *name, composite->rate_hw = rate_hw; composite->rate_ops = rate_ops; clk_composite_ops->recalc_rate = clk_composite_recalc_rate; + if (rate_ops->determine_rate) + clk_composite_ops->determine_rate = clk_composite_determine_rate; } if (gate_hw && gate_ops) { |