[ARM] pxa: allow clk aliases

We need to support more than one name+device for a struct clk for a
small number of peripherals.  We do this by re-using struct clk alias
to another struct clk - IOW, if we find that the entry we're using is
an alias, we return the aliased entry not the one we found.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/clock.h b/arch/arm/mach-pxa/clock.h
index bc6b77e1592e..83cbfaba485d 100644
--- a/arch/arm/mach-pxa/clock.h
+++ b/arch/arm/mach-pxa/clock.h
@@ -15,6 +15,7 @@ struct clk {
         unsigned int            cken;
         unsigned int            delay;
         unsigned int            enabled;
+        struct clk              *other;
 };
 
 #define INIT_CKEN(_name, _cken, _rate, _delay, _dev)    \
@@ -35,6 +36,17 @@ struct clk {
                 .cken   = CKEN_##_cken,                 \
         }
 
+/*
+ * This is a placeholder to alias one clock device+name pair
+ * to another struct clk.
+ */
+#define INIT_CKOTHER(_name, _other, _dev)               \
+        {                                               \
+                .name   = _name,                        \
+                .dev    = _dev,                         \
+                .other  = _other,                       \
+        }
+
 extern const struct clkops clk_cken_ops;
 
 void clk_cken_enable(struct clk *clk);