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clk: fixed-rate: Convert into a module platform driver

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Adds support for fixed-rate 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:
Ricardo Ribalda Delgado 2016-07-05 18:23:34 +02:00 committed by Stephen Boyd
parent 971451b3b1
commit 435779fe13
1 changed files with 64 additions and 7 deletions
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71
drivers/clk/clk-fixed-rate.c
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@ -15,6 +15,7 @@
#include <linux/io.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/platform_device.h>
/*
* DOC: basic fixed-rate clock that cannot gate
@ -157,18 +158,16 @@ void clk_hw_unregister_fixed_rate(struct clk_hw *hw)
EXPORT_SYMBOL_GPL(clk_hw_unregister_fixed_rate);
#ifdef CONFIG_OF
/**
* of_fixed_clk_setup() - Setup function for simple fixed rate clock
*/
void of_fixed_clk_setup(struct device_node *node)
static struct clk *_of_fixed_clk_setup(struct device_node *node)
{
struct clk *clk;
const char *clk_name = node->name;
u32 rate;
u32 accuracy = 0;
int ret;
if (of_property_read_u32(node, "clock-frequency", &rate))
return;
return ERR_PTR(-EIO);
of_property_read_u32(node, "clock-accuracy", &accuracy);
@ -176,9 +175,67 @@ void of_fixed_clk_setup(struct device_node *node)
clk = clk_register_fixed_rate_with_accuracy(NULL, clk_name, NULL,
0, rate, accuracy);
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_clk_setup() - Setup function for simple fixed rate clock
*/
void of_fixed_clk_setup(struct device_node *node)
{
_of_fixed_clk_setup(node);
}
EXPORT_SYMBOL_GPL(of_fixed_clk_setup);
CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup);
static int of_fixed_clk_remove(struct platform_device *pdev)
{
struct clk *clk = platform_get_drvdata(pdev);
clk_unregister_fixed_rate(clk);
return 0;
}
static int of_fixed_clk_probe(struct platform_device *pdev)
{
struct clk *clk;
/*
* This function is not executed when of_fixed_clk_setup
* succeeded.
*/
clk = _of_fixed_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_clk_ids[] = {
{ .compatible = "fixed-clock" },
{ }
};
MODULE_DEVICE_TABLE(of, of_fixed_clk_ids);
static struct platform_driver of_fixed_clk_driver = {
.driver = {
.name = "of_fixed_clk",
.of_match_table = of_fixed_clk_ids,
},
.probe = of_fixed_clk_probe,
.remove = of_fixed_clk_remove,
};
builtin_platform_driver(of_fixed_clk_driver);
#endif