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clk: Support for clock parents and rates assigned from device tree

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This patch adds helper functions to configure clock parents and rates
as specified through 'assigned-clock-parents', 'assigned-clock-rates'
DT properties for a clock provider or clock consumer device.
The helpers are now being called by the bus code for the platform, I2C
and SPI busses, before the driver probing and also in the clock core
after registration of a clock provider.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Sylwester Nawrocki
2014-06-18 17:29:32 +02:00
committed by Mike Turquette
parent 09575693a2
commit 86be408bfb
8 changed files with 227 additions and 2 deletions
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12
drivers/clk/clk.c
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@@ -10,6 +10,7 @@
*/
#include <linux/clk-private.h>
#include <linux/clk/clk-conf.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
@@ -2382,6 +2383,7 @@ int of_clk_add_provider(struct device_node *np,
void *data)
{
struct of_clk_provider *cp;
int ret;
cp = kzalloc(sizeof(struct of_clk_provider), GFP_KERNEL);
if (!cp)
@@ -2396,7 +2398,11 @@ int of_clk_add_provider(struct device_node *np,
mutex_unlock(&of_clk_mutex);
pr_debug("Added clock from %s\n", np->full_name);
return 0;
ret = of_clk_set_defaults(np, true);
if (ret < 0)
of_clk_del_provider(np);
return ret;
}
EXPORT_SYMBOL_GPL(of_clk_add_provider);
@@ -2573,7 +2579,10 @@ void __init of_clk_init(const struct of_device_id *matches)
list_for_each_entry_safe(clk_provider, next,
&clk_provider_list, node) {
if (force || parent_ready(clk_provider->np)) {
clk_provider->clk_init_cb(clk_provider->np);
of_clk_set_defaults(clk_provider->np, true);
list_del(&clk_provider->node);
kfree(clk_provider);
is_init_done = true;
@@ -2588,7 +2597,6 @@ void __init of_clk_init(const struct of_device_id *matches)
*/
if (!is_init_done)
force = true;
}
}
#endif