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Commit 435779fe authored by Ricardo Ribalda Delgado's avatar Ricardo Ribalda Delgado Committed by Stephen Boyd
Browse files

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



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: default avatarRicardo 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: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 971451b3

drivers/clk/clk-fixed-rate.c

+64 −7
Original line number Diff line number Diff line
@@ -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