ASoC: dt-bindings: add mclk provider support to stm32 sai

add mclk provider support to stm32 sai

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
index 3a3fc50..3f4467f 100644 (file)
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
@@ -31,7 +31,11 @@ SAI subnodes required properties:
   - reg: Base address and size of SAI sub-block register set.
   - clocks: Must contain one phandle and clock specifier pair
        for sai_ck which feeds the internal clock generator.
+       If the SAI shares a master clock, with another SAI set as MCLK
+       clock provider, SAI provider phandle must be specified here.
   - clock-names: Must contain "sai_ck".
+       Must also contain "MCLK", if SAI shares a master clock,
+       with a SAI set as MCLK clock provider.
   - dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt
   - dma-names: identifier string for each DMA request line
        "tx": if sai sub-block is configured as playback DAI
@@ -51,6 +55,9 @@ SAI subnodes Optional properties:
        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
+   - #clock-cells: should be 0. This property must be present if the SAI device
+       is a master clock provider, according to clocks bindings, described in
+       Documentation/devicetree/bindings/clock/clock-bindings.txt.
 
 The device node should contain one 'port' child node with one child 'endpoint'
 node, according to the bindings defined in Documentation/devicetree/bindings/