clk: add clock-indices support

Add a property called clock-indices to allow clock-output-names
to be used where the index used to lookup a clock is not a 1:1
mapping to the array position in the clock-output-names

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/clock-bindings.txt b/Documentation/devicetree/bindings/clock/clock-bindings.txt
index 7c52c29d99fa..700e7aac3717 100644
--- a/Documentation/devicetree/bindings/clock/clock-bindings.txt
+++ b/Documentation/devicetree/bindings/clock/clock-bindings.txt
@@ -44,6 +44,23 @@ For example:
   clocks by index. The names should reflect the clock output signal
   names for the device.
 
+clock-indices:     If the identifyng number for the clocks in the node
+                   is not linear from zero, then the this mapping allows
+                   the mapping of identifiers into the clock-output-names
+                   array.
+
+For example, if we have two clocks <&oscillator 1> and <&oscillator 3>:
+
+        oscillator {
+                compatible = "myclocktype";
+                #clock-cells = <1>;
+                clock-indices = <1>, <3>;
+                clock-output-names = "clka", "clkb";
+        }
+
+        This ensures we do not have any empty nodes in clock-output-names
+
+
 ==Clock consumers==
 
 Required properties: