mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
clk: fixed-factor: Convert into a module platform driver
Adds support for fixed-factor clock providers which have not been enabled via of_clk_init(). This is required by Device trees overlays that introduce clocks providers. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> [sboyd@codeaurora.org: Make new private function static, don't check clk for NULL when unregistering in driver remove] Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
parent
989eafd0b6
commit
971451b3b1
1 changed files with 65 additions and 8 deletions
|
@ -12,6 +12,7 @@
|
|||
#include <linux/slab.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
/*
|
||||
* DOC: basic fixed multiplier and divider clock that cannot gate
|
||||
|
@ -147,27 +148,25 @@ static const struct of_device_id set_rate_parent_matches[] = {
|
|||
{ /* Sentinel */ },
|
||||
};
|
||||
|
||||
/**
|
||||
* of_fixed_factor_clk_setup() - Setup function for simple fixed factor clock
|
||||
*/
|
||||
void __init of_fixed_factor_clk_setup(struct device_node *node)
|
||||
static struct clk *_of_fixed_factor_clk_setup(struct device_node *node)
|
||||
{
|
||||
struct clk *clk;
|
||||
const char *clk_name = node->name;
|
||||
const char *parent_name;
|
||||
unsigned long flags = 0;
|
||||
u32 div, mult;
|
||||
int ret;
|
||||
|
||||
if (of_property_read_u32(node, "clock-div", &div)) {
|
||||
pr_err("%s Fixed factor clock <%s> must have a clock-div property\n",
|
||||
__func__, node->name);
|
||||
return;
|
||||
return ERR_PTR(-EIO);
|
||||
}
|
||||
|
||||
if (of_property_read_u32(node, "clock-mult", &mult)) {
|
||||
pr_err("%s Fixed factor clock <%s> must have a clock-mult property\n",
|
||||
__func__, node->name);
|
||||
return;
|
||||
return ERR_PTR(-EIO);
|
||||
}
|
||||
|
||||
of_property_read_string(node, "clock-output-names", &clk_name);
|
||||
|
@ -178,10 +177,68 @@ void __init of_fixed_factor_clk_setup(struct device_node *node)
|
|||
|
||||
clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
|
||||
mult, div);
|
||||
if (!IS_ERR(clk))
|
||||
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
||||
if (IS_ERR(clk))
|
||||
return clk;
|
||||
|
||||
ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
||||
if (ret) {
|
||||
clk_unregister(clk);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
return clk;
|
||||
}
|
||||
|
||||
/**
|
||||
* of_fixed_factor_clk_setup() - Setup function for simple fixed factor clock
|
||||
*/
|
||||
void __init of_fixed_factor_clk_setup(struct device_node *node)
|
||||
{
|
||||
_of_fixed_factor_clk_setup(node);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_fixed_factor_clk_setup);
|
||||
CLK_OF_DECLARE(fixed_factor_clk, "fixed-factor-clock",
|
||||
of_fixed_factor_clk_setup);
|
||||
|
||||
static int of_fixed_factor_clk_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct clk *clk = platform_get_drvdata(pdev);
|
||||
|
||||
clk_unregister_fixed_factor(clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int of_fixed_factor_clk_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct clk *clk;
|
||||
|
||||
/*
|
||||
* This function is not executed when of_fixed_factor_clk_setup
|
||||
* succeeded.
|
||||
*/
|
||||
clk = _of_fixed_factor_clk_setup(pdev->dev.of_node);
|
||||
if (IS_ERR(clk))
|
||||
return PTR_ERR(clk);
|
||||
|
||||
platform_set_drvdata(pdev, clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id of_fixed_factor_clk_ids[] = {
|
||||
{ .compatible = "fixed-factor-clock" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, of_fixed_factor_clk_ids);
|
||||
|
||||
static struct platform_driver of_fixed_factor_clk_driver = {
|
||||
.driver = {
|
||||
.name = "of_fixed_factor_clk",
|
||||
.of_match_table = of_fixed_factor_clk_ids,
|
||||
},
|
||||
.probe = of_fixed_factor_clk_probe,
|
||||
.remove = of_fixed_factor_clk_remove,
|
||||
};
|
||||
builtin_platform_driver(of_fixed_factor_clk_driver);
|
||||
#endif
|
||||
|
|
Loading…
Reference in a new issue