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: 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>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index ad2ac94fede8..fabbfe1a9253 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -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;