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clk: add common of_clk_init() function

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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: Prashant Gaikwad <pgaikwad@nvidia.com>
Tested-by: Tony Prisk <linux@prisktech.co.nz>
Tested-by: Pawel Moll <pawel.moll@arm.com>
Tested-by: Rob Herring <rob.herring@calxeda.com>
Tested-by: Josh Cartwright <josh.cartwright@ni.com>
Reviewed-by: Josh Cartwright <josh.cartwright@ni.com>
Acked-by: Maxime Ripard <maxime.ripard@anandra.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
[mturquette@linaro.org: merge conflict from missing CLKSRC_OF_TABLES()]

Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Prashant Gaikwad 2013-01-04 12:30:52 +05:30 committed by Mike Turquette
parent 4cfe54e579
commit f2f6c2556d
4 changed files with 26 additions and 0 deletions
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1
drivers/clk/clk-fixed-rate.c
View File

@ -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

9
drivers/clk/clk.c
View File

@ -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;

10
include/asm-generic/vmlinux.lds.h
View File

@ -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 \

6
include/linux/clk-provider.h
View File

@ -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 */