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clk: add of_clk_init and CLK_OF_DECLARE macro 

This add barebox versions of of_clk_init for parsing and registering
clock providers from DT. Also, a macro CLK_OF_DECLARE is added, that
allows to put init callbacks into its own section that can be linked
in the binary.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sebastian Hesselbarth 2013-11-09 14:24:19 +01:00 committed by Sascha Hauer
parent fa1a406f72
commit feb1e38b43
2 changed files with 51 additions and 0 deletions
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37
drivers/clk/clk.c
View File

@ -271,6 +271,10 @@ struct of_clk_provider {
void *data;
};
extern struct of_device_id __clk_of_table_start[];
const struct of_device_id __clk_of_table_sentinel
__attribute__ ((unused,section (".__clk_of_table_end")));
static LIST_HEAD(of_clk_providers);
struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
@ -355,6 +359,39 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
return clk;
}
/**
* of_clk_init() - Scan and init clock providers from the DT
* @root: parent of the first level to probe or NULL for the root of the tree
* @matches: array of compatible values and init functions for providers.
*
* This function scans the device tree for matching clock providers and
* calls their initialization functions
*
* Returns 0 on success, < 0 on failure.
*/
int of_clk_init(struct device_node *root, const struct of_device_id *matches)
{
const struct of_device_id *match;
int rc;
if (!root)
root = of_find_node_by_path("/");
if (!root)
return -EINVAL;
if (!matches)
matches = __clk_of_table_start;
for_each_matching_node_and_match(root, matches, &match) {
of_clk_init_cb_t clk_init_cb = (of_clk_init_cb_t)match->data;
rc = clk_init_cb(root);
if (rc)
pr_err("%s: failed to init clock for %s: %d\n",
__func__, root->full_name, rc);
}
return 0;
}
#endif
static void dump_one(struct clk *clk, int verbose, int indent)

14
include/linux/clk.h
View File

@ -12,6 +12,7 @@
#define __LINUX_CLK_H
#include <linux/err.h>
#include <linux/stringify.h>
struct device_d;
@ -278,6 +279,11 @@ void clk_dump(int verbose);
struct device_node;
struct of_phandle_args;
#define CLK_OF_DECLARE(name, compat, fn) \
const struct of_device_id __clk_of_table_##name \
__attribute__ ((unused,section (".__clk_of_table_" __stringify(name)))) \
= { .compatible = compat, .data = (u32)fn }
#if defined(CONFIG_OFTREE) && defined(CONFIG_COMMON_CLK_OF_PROVIDER)
int of_clk_add_provider(struct device_node *np,
struct clk *(*clk_src_get)(struct of_phandle_args *args,
@ -285,6 +291,8 @@ int of_clk_add_provider(struct device_node *np,
void *data);
void of_clk_del_provider(struct device_node *np);
typedef int (*of_clk_init_cb_t)(struct device_node *);
struct clk_onecell_data {
struct clk **clks;
unsigned int clk_num;
@ -295,6 +303,7 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec, void *data);
struct clk *of_clk_get(struct device_node *np, int index);
struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
int of_clk_init(struct device_node *root, const struct of_device_id *matches);
#else
static inline struct clk *of_clk_get(struct device_node *np, int index)
{
@ -305,6 +314,11 @@ static inline struct clk *of_clk_get_by_name(struct device_node *np,
{
return ERR_PTR(-ENOENT);
}
static inline int of_clk_init(struct device_node *root,
const struct of_device_id *matches)
{
return 0;
}
#endif
#endif