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clk: composite: allow fixed rates & fixed dividers 

The composite clock assumes that any clock implementing the .recalc_rate
callback will also implement .round_rate and .set_rate.  This is not
always true; the basic fixed-rate clock will only implement .recalc_rate
and a fixed-divider clock may choose to implement .recalc_rate and
.round_rate but not .set_rate.

Fix this by conditionally registering .round_rate and .set_rate
callbacks based on the rate_ops passed in to clk_composite_register.

Signed-off-by: Mike Turquette <mturquette@linaro.org>
Cc: Prashant Gaikwad <pgaikwad@nvidia.com>
Tested-by: Emilio López <emilio@elopez.com.ar>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
This commit is contained in:
Mike Turquette 2013-04-11 11:31:37 -07:00
parent d3a1c7be83
commit f363e21593
1 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/clk/clk-composite.c
View File

@ -150,17 +150,26 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
}
if (rate_hw && rate_ops) {
if (!rate_ops->recalc_rate || !rate_ops->round_rate ||
!rate_ops->set_rate) {
if (!rate_ops->recalc_rate) {
clk = ERR_PTR(-EINVAL);
goto err;
}
/* .round_rate is a prerequisite for .set_rate */
if (rate_ops->round_rate) {
clk_composite_ops->round_rate = clk_composite_round_rate;
if (rate_ops->set_rate) {
clk_composite_ops->set_rate = clk_composite_set_rate;
}
} else {
WARN(rate_ops->set_rate,
"%s: missing round_rate op is required\n",
__func__);
}
composite->rate_hw = rate_hw;
composite->rate_ops = rate_ops;
clk_composite_ops->recalc_rate = clk_composite_recalc_rate;
clk_composite_ops->round_rate = clk_composite_round_rate;
clk_composite_ops->set_rate = clk_composite_set_rate;
}
if (gate_hw && gate_ops) {