ASoC: stm32: Add synchronization to SAI bindings

Add synchronization configuration to STM32 SAI bindings.
This patch also adds peripheral clock which is required
to access synchronization register.

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

1 files changed, 11 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
index f1c5ae59e7c9..1f9cd7095337 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
@@ -10,13 +10,21 @@ Required properties:
   - reg: Base address and size of SAI common register set.
   - clocks: Must contain phandle and clock specifier pairs for each entry
         in clock-names.
-  - clock-names: Must contain "x8k" and "x11k"
+  - clock-names: Must contain "pclk" "x8k" and "x11k"
+        "pclk": Clock which feeds the peripheral bus interface.
+                Mandatory for "st,stm32h7-sai" compatible.
+                Not used for "st,stm32f4-sai" compatible.
         "x8k": SAI parent clock for sampling rates multiple of 8kHz.
         "x11k": SAI parent clock for sampling rates multiple of 11.025kHz.
   - interrupts: cpu DAI interrupt line shared by SAI sub-blocks
 
 Optional properties:
   - resets: Reference to a reset controller asserting the SAI
+  - st,sync: specify synchronization mode.
+        By default SAI sub-block is in asynchronous mode.
+        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.
 
 SAI subnodes:
 Two subnodes corresponding to SAI sub-block instances A et B can be defined.
@@ -52,8 +60,8 @@ sai1: sai1@40015800 {
         #size-cells = <1>;
         ranges = <0 0x40015800 0x400>;
         reg = <0x40015800 0x4>;
-        clocks = <&rcc PLL1_Q>, <&rcc PLL2_P>;
-        clock-names = "x8k", "x11k";
+        clocks = <&rcc SAI1_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
+        clock-names = "pclk", "x8k", "x11k";
         interrupts = <87>;
 
         sai1a: audio-controller@40015804 {