Add S/PDIF IEC6958 protocol support to STM32 SAI bindings.

Signed-off-by: olivier moysan <olivier.moy...@st.com>
---
 Documentation/devicetree/bindings/sound/st,stm32-sai.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt 
b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
index b1acc1a..f301cdf 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
@@ -45,6 +45,12 @@ SAI subnodes Optional properties:
        This property sets SAI sub-block as slave of another SAI sub-block.
        Must contain the phandle and index of the sai sub-block providing
        the synchronization.
+  - st,iec60958: support S/PDIF IEC6958 protocol for playback
+       IEC60958 protocol is not available for capture.
+       By default, custom protocol is assumed, meaning that protocol is
+       configured according to protocol defined in related DAI link node,
+       such as i2s, left justified, right justified, dsp and pdm protocols.
+       Note: ac97 protocol is not supported by SAI driver
 
 The device node should contain one 'port' child node with one child 'endpoint'
 node, according to the bindings defined in Documentation/devicetree/bindings/
-- 
1.9.1

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