Commit f2f6c255 authored by Prashant Gaikwad's avatar Prashant Gaikwad Committed by Mike Turquette
Browse files

clk: add common of_clk_init() function 



Modify of_clk_init function so that it will determine which
driver to initialize based on device tree instead of each driver
registering to it.

Based on a similar patch for drivers/irqchip by Thomas Petazzoni and
drivers/clocksource by Stephen Warren.

Signed-off-by: default avatarPrashant Gaikwad <pgaikwad@nvidia.com>
Tested-by: default avatarTony Prisk <linux@prisktech.co.nz>
Tested-by: default avatarPawel Moll <pawel.moll@arm.com>
Tested-by: default avatarRob Herring <rob.herring@calxeda.com>
Tested-by: default avatarJosh Cartwright <josh.cartwright@ni.com>
Reviewed-by: default avatarJosh Cartwright <josh.cartwright@ni.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@anandra.org>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
[mturquette@linaro.org: merge conflict from missing CLKSRC_OF_TABLES()]

Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 4cfe54e5

drivers/clk/clk-fixed-rate.c

+1 −0
Original line number Diff line number Diff line
@@ -101,4 +101,5 @@ void of_fixed_clk_setup(struct device_node *node) 
		of_clk_add_provider(node, of_clk_src_simple_get, clk);

}

EXPORT_SYMBOL_GPL(of_fixed_clk_setup);

CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup);

#endif

drivers/clk/clk.c

+9 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/slab.h>

#include <linux/of.h>

#include <linux/device.h>

#include <linux/init.h>



static DEFINE_SPINLOCK(enable_lock);

static DEFINE_MUTEX(prepare_lock);
@@ -1803,6 +1804,11 @@ struct of_clk_provider { 
	void *data;

};



extern struct of_device_id __clk_of_table[];



static const struct of_device_id __clk_of_table_sentinel

	__used __section(__clk_of_table_end);



static LIST_HEAD(of_clk_providers);

static DEFINE_MUTEX(of_clk_lock);
@@ -1931,6 +1937,9 @@ void __init of_clk_init(const struct of_device_id *matches) 
{

	struct device_node *np;



	if (!matches)

		matches = __clk_of_table;



	for_each_matching_node(np, matches) {

		const struct of_device_id *match = of_match_node(matches, np);

		of_clk_init_cb_t clk_init_cb = match->data;

include/asm-generic/vmlinux.lds.h

+10 −0
Original line number Diff line number Diff line
@@ -150,6 +150,15 @@ 
#endif





#ifdef CONFIG_COMMON_CLK

#define CLK_OF_TABLES() . = ALIGN(8);				\

			VMLINUX_SYMBOL(__clk_of_table) = .;	\

			*(__clk_of_table)			\

			*(__clk_of_table_end)

#else

#define CLK_OF_TABLES()

#endif



#define KERNEL_DTB()							\

	STRUCT_ALIGN();							\

	VMLINUX_SYMBOL(__dtb_start) = .;				\
@@ -493,6 +502,7 @@ 
	DEV_DISCARD(init.rodata)					\

	CPU_DISCARD(init.rodata)					\

	MEM_DISCARD(init.rodata)					\

	CLK_OF_TABLES()							\

	KERNEL_DTB()



#define INIT_TEXT							\

include/linux/clk-provider.h

+6 −0
Original line number Diff line number Diff line
@@ -379,7 +379,13 @@ struct clk_onecell_data { 
};

struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);

const char *of_clk_get_parent_name(struct device_node *np, int index);



void of_clk_init(const struct of_device_id *matches);



#define CLK_OF_DECLARE(name, compat, fn)			\

	static const struct of_device_id __clk_of_table_##name	\

		__used __section(__clk_of_table)		\

		= { .compatible = compat, .data = fn };



#endif /* CONFIG_COMMON_CLK */

#endif /* CLK_PROVIDER_H */

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