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| author | Phil Edworthy <phil.edworthy@renesas.com> | 2018-12-03 12:13:09 +0100 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2019-02-06 19:33:10 +0100 |
| commit | 60b8f0ddf1a927ef02141a6610fd52575134f821 (patch) | |
| tree | 60ea4fd636e291ff196d984885d2690571c9021b /Documentation/driver-model | |
| parent | clk: Add comment about __of_clk_get_by_name() error values (diff) | |
| download | linux-60b8f0ddf1a927ef02141a6610fd52575134f821.tar.xz 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 'Documentation/driver-model')
| -rw-r--r-- | Documentation/driver-model/devres.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index b277cafce71e..83f38c0439cd 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -242,6 +242,7 @@ certainly invest a bit more effort into libata core layer). CLOCK devm_clk_get() + devm_clk_get_optional() devm_clk_put() devm_clk_hw_register() devm_of_clk_add_hw_provider() |