forked from mirrors/linux
60b8f0ddf1
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>
142 lines
2.7 KiB
C
142 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/clk.h>
|
|
#include <linux/device.h>
|
|
#include <linux/export.h>
|
|
#include <linux/gfp.h>
|
|
|
|
static void devm_clk_release(struct device *dev, void *res)
|
|
{
|
|
clk_put(*(struct clk **)res);
|
|
}
|
|
|
|
struct clk *devm_clk_get(struct device *dev, const char *id)
|
|
{
|
|
struct clk **ptr, *clk;
|
|
|
|
ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
clk = clk_get(dev, id);
|
|
if (!IS_ERR(clk)) {
|
|
*ptr = clk;
|
|
devres_add(dev, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return clk;
|
|
}
|
|
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;
|
|
};
|
|
|
|
static void devm_clk_bulk_release(struct device *dev, void *res)
|
|
{
|
|
struct clk_bulk_devres *devres = res;
|
|
|
|
clk_bulk_put(devres->num_clks, devres->clks);
|
|
}
|
|
|
|
int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
|
|
struct clk_bulk_data *clks)
|
|
{
|
|
struct clk_bulk_devres *devres;
|
|
int ret;
|
|
|
|
devres = devres_alloc(devm_clk_bulk_release,
|
|
sizeof(*devres), GFP_KERNEL);
|
|
if (!devres)
|
|
return -ENOMEM;
|
|
|
|
ret = clk_bulk_get(dev, num_clks, clks);
|
|
if (!ret) {
|
|
devres->clks = clks;
|
|
devres->num_clks = num_clks;
|
|
devres_add(dev, devres);
|
|
} else {
|
|
devres_free(devres);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
|
|
|
|
int __must_check devm_clk_bulk_get_all(struct device *dev,
|
|
struct clk_bulk_data **clks)
|
|
{
|
|
struct clk_bulk_devres *devres;
|
|
int ret;
|
|
|
|
devres = devres_alloc(devm_clk_bulk_release,
|
|
sizeof(*devres), GFP_KERNEL);
|
|
if (!devres)
|
|
return -ENOMEM;
|
|
|
|
ret = clk_bulk_get_all(dev, &devres->clks);
|
|
if (ret > 0) {
|
|
*clks = devres->clks;
|
|
devres->num_clks = ret;
|
|
devres_add(dev, devres);
|
|
} else {
|
|
devres_free(devres);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
|
|
|
|
static int devm_clk_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct clk **c = res;
|
|
if (!c || !*c) {
|
|
WARN_ON(!c || !*c);
|
|
return 0;
|
|
}
|
|
return *c == data;
|
|
}
|
|
|
|
void devm_clk_put(struct device *dev, struct clk *clk)
|
|
{
|
|
int ret;
|
|
|
|
ret = devres_release(dev, devm_clk_release, devm_clk_match, 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);
|