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clk: Add clk_get_by_name_optional

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This adds a helper function for clk_get_by_name in cases where the clock is
optional. Hopefully this helps point driver writers in the right direction.
Also convert some existing users.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20220115205247.566210-2-seanga2@gmail.com
This commit is contained in:
Sean Anderson 2022-01-15 15:52:47 -05:00
parent a0abea867a
commit e96e2132f9
3 changed files with 29 additions and 4 deletions
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5
drivers/clk/clk_zynq.c
View file

@ -472,8 +472,9 @@ static int zynq_clk_probe(struct udevice *dev)
for (i = 0; i < 2; i++) {
sprintf(name, "gem%d_emio_clk", i);
ret = clk_get_by_name(dev, name, &priv->gem_emio_clk[i]);
if (ret < 0 && ret != -ENODATA) {
ret = clk_get_by_name_optional(dev, name,
&priv->gem_emio_clk[i]);
if (ret) {
dev_err(dev, "failed to get %s clock\n", name);
return ret;
}

4
drivers/rng/meson-rng.c
View file

@ -91,8 +91,8 @@ static int meson_rng_of_to_plat(struct udevice *dev)
return -ENODEV;
/* Get optional "core" clock */
err = clk_get_by_name(dev, "core", &pdata->clk);
if (err && err != -ENODATA)
err = clk_get_by_name_optional(dev, "core", &pdata->clk);
if (err)
return err;
return 0;

24
include/clk.h
View file

@ -287,6 +287,30 @@ static inline int clk_release_all(struct clk *clk, int count)
}
#endif
/**
* clk_get_by_name_optional() - Get/request a optional clock by name.
* @dev: The client device.
* @name: The name of the clock to request, within the client's list of
* clocks.
* @clk: A pointer to a clock struct to initialize.
*
* Behaves the same as clk_get_by_name(), except when there is no clock
* provider. In the latter case, return 0.
*
* Return: 0 if OK, or a negative error code.
*/
static inline int clk_get_by_name_optional(struct udevice *dev,
const char *name, struct clk *clk)
{
int ret;
ret = clk_get_by_name(dev, name, clk);
if (ret == -ENODATA)
return 0;
return ret;
}
/**
* clk_get_by_name_nodev_optional - Get/request an optinonal clock by name
* without a device.