As stated in SiL9022/24 datasheet, master clock is not required for I2S.
Make mclk property optional in DT bindings.

Fixes: 3f18021f43a3 ("dt-bindings: display: sii902x: Add HDMI audio bindings")

Signed-off-by: Olivier Moysan <olivier.moy...@st.com>
---
 Documentation/devicetree/bindings/display/bridge/sii902x.txt | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/sii902x.txt 
b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
index 2df44b7d3821..6e14e087c0d0 100644
--- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
+++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
@@ -26,9 +26,8 @@ Optional properties:
        - clocks: phandle and clock specifier for each clock listed in
            the clock-names property
        - clock-names: "mclk"
-          Describes SII902x MCLK input. MCLK is used to produce
-          HDMI audio CTS values. This property is required if
-          "#sound-dai-cells"-property is present. This property follows
+          Describes SII902x MCLK input. MCLK can be used to produce
+          HDMI audio CTS values. This property follows
           Documentation/devicetree/bindings/clock/clock-bindings.txt
           consumer binding.
 
-- 
2.7.4

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