diff options
author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2016-12-05 05:23:20 +0000 |
---|---|---|
committer | Stephen Boyd <sboyd@codeaurora.org> | 2016-12-08 16:37:33 -0800 |
commit | 71a2f11511b4d1dc8b8e326e10ec6533b534ddf1 (patch) | |
tree | e6057334500d72bc2637f811ebcb7d761bb7f135 /drivers/clk/clk-devres.c | |
parent | 16cd77645bddbcee951c63b964f23826dadbfd2e (diff) | |
download | linux-71a2f11511b4d1dc8b8e326e10ec6533b534ddf1.tar.gz linux-71a2f11511b4d1dc8b8e326e10ec6533b534ddf1.tar.bz2 linux-71a2f11511b4d1dc8b8e326e10ec6533b534ddf1.zip |
clk: add devm_get_clk_from_child() API
Some driver is using this type of DT bindings for clock (more detail,
see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt).
sound_soc {
...
cpu {
clocks = <&xxx>;
...
};
codec {
clocks = <&xxx>;
...
};
};
Current driver in this case uses of_clk_get() for each node, but there
is no devm_of_clk_get() today.
OTOH, the problem of having devm_of_clk_get() is that it encourages the
use of of_clk_get() when clk_get() is more desirable.
Thus, this patch adds new devm_get_clk_from_chile() which explicitly
reads as get a clock from a child node of this device.
By this function, we can also use this type of DT bindings
sound_soc {
clocks = <&xxx>, <&xxx>;
clock-names = "cpu", "codec";
clock-ranges;
...
cpu {
...
};
codec {
...
};
};
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[sboyd@codeurora.org: Rename subject to clk + add API]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/clk-devres.c')
-rw-r--r-- | drivers/clk/clk-devres.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index 8f571548870f..3a218c3a06ae 100644 --- a/drivers/clk/clk-devres.c +++ b/drivers/clk/clk-devres.c @@ -53,3 +53,24 @@ void devm_clk_put(struct device *dev, struct clk *clk) WARN_ON(ret); } EXPORT_SYMBOL(devm_clk_put); + +struct clk *devm_get_clk_from_child(struct device *dev, + struct device_node *np, const char *con_id) +{ + struct clk **ptr, *clk; + + ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + clk = of_clk_get_by_name(np, con_id); + if (!IS_ERR(clk)) { + *ptr = clk; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return clk; +} +EXPORT_SYMBOL(devm_get_clk_from_child); |