metag: init common clk and use "core" clk

If the common clock framework is enabled, call of_clk_init(NULL) in
time_init() to register device tree clocks with the clock framework.

After this time_init() calls a new function init_metag_clocks(), which
looks for a clock named "core" in the node compatible with "img,meta"
(usually the root node). If found the get_core_freq machine callback is
overridden to obtain the core clock frequency using that clock.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: devicetree-discuss@lists.ozlabs.org

1 files changed, 12 insertions, 2 deletions

diff --git a/arch/metag/kernel/time.c b/arch/metag/kernel/time.c
index 17dc107..f1c8c53 100644
--- a/arch/metag/kernel/time.c
+++ b/arch/metag/kernel/time.c
@@ -5,11 +5,21 @@
  *
  */
 
-#include <linux/init.h>
-
 #include <clocksource/metag_generic.h>
+#include <linux/clk-provider.h>
+#include <linux/init.h>
+#include <asm/clock.h>
 
 void __init time_init(void)
 {
+#ifdef CONFIG_COMMON_CLK
+	/* Init clocks from device tree */
+	of_clk_init(NULL);
+#endif
+
+	/* Init meta clocks, particularly the core clock */
+	init_metag_clocks();
+
+	/* Set up the timer clock sources */
 	metag_generic_timer_init();
 }