[PATCH v3 2/2] Binding: atmel-ssc: add option to choose clock

[voice.shen@atmel.com (Bo Shen)]

Add the option to choose clock on which pin input to SSC (as slave).
Default is on TK pin to SSC, add "atmel,clk-from-rk-pin" option to
specify the clock is on RK pin to SSC.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
---
Changes in v3:
  - None
Series-changes: 2
  - using "-" replace "_" in binding document

 Documentation/devicetree/bindings/misc/atmel-ssc.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/misc/atmel-ssc.txt b/Documentation/devicetree/bindings/misc/atmel-ssc.txt
index a45ae08..5c1e14e 100644
--- a/Documentation/devicetree/bindings/misc/atmel-ssc.txt
+++ b/Documentation/devicetree/bindings/misc/atmel-ssc.txt
@@ -14,6 +14,14 @@ Required properties for devices compatible with "atmel,at91sam9g45-ssc":
   See Documentation/devicetree/bindings/dma/atmel-dma.txt for details.
 - dma-names: Must be "tx", "rx".
 
+Optional properties:
+  - atmel,clk-from-rk-pin: bool property.
+     - When SSC works in slave mode, according to the hardware design, the
+       clock can get from TK pin, and also can get from RK pin. So, add
+       this parameter to choose where the clock from.
+     - By default the clock is from TK pin, if the clock from RK pin, this
+       property is needed.
+
 Examples:
 - PDC transfer:
 ssc0: ssc at fffbc000 {
-- 
1.8.5.2