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| author | Phil Edworthy | 2018-12-03 12:13:09 +0100 |
|---|---|---|
| committer | Stephen Boyd | 2019-02-06 19:33:10 +0100 |
| commit | 60b8f0ddf1a927ef02141a6610fd52575134f821 (patch) | |
| tree | 60ea4fd636e291ff196d984885d2690571c9021b /drivers/clk/clk-devres.c | |
| parent | clk: Add comment about __of_clk_get_by_name() error values (diff) | |
| download | kernel-qcow2-linux-60b8f0ddf1a927ef02141a6610fd52575134f821.tar.gz kernel-qcow2-linux-60b8f0ddf1a927ef02141a6610fd52575134f821.tar.xz kernel-qcow2-linux-60b8f0ddf1a927ef02141a6610fd52575134f821.zip | |
clk: Add (devm_)clk_get_optional() functions
This adds clk_get_optional() and devm_clk_get_optional() functions to get
optional clocks.
They behave the same as (devm_)clk_get() except where there is no clock
producer. In this case, instead of returning -ENOENT, the function
returns NULL. This makes error checking simpler and allows
clk_prepare_enable, etc to be called on the returned reference
without additional checks.
Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Russell King <linux@armlinux.org.uk>
[sboyd@kernel.org: Document in devres.txt]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/clk-devres.c')
| -rw-r--r-- | drivers/clk/clk-devres.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index c9a86156ced8..daa1fc8fba53 100644 --- a/drivers/clk/clk-devres.c +++ b/drivers/clk/clk-devres.c @@ -29,6 +29,17 @@ struct clk *devm_clk_get(struct device *dev, const char *id) } EXPORT_SYMBOL(devm_clk_get); +struct clk *devm_clk_get_optional(struct device *dev, const char *id) +{ + struct clk *clk = devm_clk_get(dev, id); + + if (clk == ERR_PTR(-ENOENT)) + return NULL; + + return clk; +} +EXPORT_SYMBOL(devm_clk_get_optional); + struct clk_bulk_devres { struct clk_bulk_data *clks; int num_clks; |