The new DT properties required for the I2S device node to be referred
as a clock provider and corresponding clock indices definition is added.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
---
.../devicetree/bindings/sound/samsung-i2s.txt | 22 ++++++++++++++++++++
include/dt-bindings/sound/samsung-i2s.h | 8 +++++++
2 files changed, 30 insertions(+)
create mode 100644 include/dt-bindings/sound/samsung-i2s.h
diff --git a/Documentation/devicetree/bindings/sound/samsung-i2s.txt b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
index d188296..09e0e18 100644
--- a/Documentation/devicetree/bindings/sound/samsung-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
@@ -33,6 +33,25 @@ Required SoC Specific Properties:
"iis" is the i2s bus clock and i2s_opclk0, i2s_opclk1 are sources of the root
clk. i2s0 has internal mux to select the source of root clk and i2s1 and i2s2
doesn't have any such mux.
+- #clock-cells: should be 1, this property must be present if the I2S device
+ is a clock provider in terms of the common clock bindings, described in
+ ../clock/clock-bindings.txt.
+- clock-output-names: from the common clock bindings, names of the CDCLK
+ I2S output clocks, suggested values are "i2s_cdclk0", "i2s_cdclk1",
+ "i2s_cdclk3" for the I2S0, I2S1, I2S2 devices recpectively.
+
+There are following clocks available at the I2S device nodes:
+ CLK_I2S_CDCLK - the CDCLK (CODECLKO) gate clock,
+ CLK_I2S_RCLK_PSR - the RCLK prescaler divider clock (corresponding to the
+ IISPSR register),
+ CLK_I2S_RCLK_SRC - the RCLKSRC mux clock (corresponding to RCLKSRC bit in
+ IISMOD register).
+
+Refer to the SoC datasheet for availability of the above clocks.
+The CLK_I2S_RCLK_PSR and CLK_I2S_RCLK_SRC clocks are usually only available
+in the IIS Multi Audio Interface (I2S0).
+Note: Old DTs may not have the #clock-cells, clock-output-names properties
+and then not use the I2S node as a clock supplier.
Optional SoC Specific Properties:
@@ -41,6 +60,7 @@ Optional SoC Specific Properties:
- pinctrl-0: Should specify pin control groups used for this controller.
- pinctrl-names: Should contain only one value - "default".
+
Example:
i2s0: i2s@03830000 {
@@ -54,6 +74,8 @@ i2s0: i2s@03830000 {
<&clock_audss EXYNOS_I2S_BUS>,
<&clock_audss EXYNOS_SCLK_I2S>;
clock-names = "iis", "i2s_opclk0", "i2s_opclk1";
+ #clock-cells;
+ clock-output-names = "i2s_cdclk0";
samsung,idma-addr = <0x03000000>;
pinctrl-names = "default";
pinctrl-0 = <&i2s0_bus>;
diff --git a/include/dt-bindings/sound/samsung-i2s.h b/include/dt-bindings/sound/samsung-i2s.h
new file mode 100644
index 0000000..0c69818d
--- /dev/null
+++ b/include/dt-bindings/sound/samsung-i2s.h
@@ -0,0 +1,8 @@
+#ifndef _DT_BINDINGS_SAMSUNG_I2S_H
+#define _DT_BINDINGS_SAMSUNG_I2S_H
+
+#define CLK_I2S_CDCLK 0
+#define CLK_I2S_RCLK_SRC 1
+#define CLK_I2S_RCLK_PSR 2
+
+#endif /* _DT_BINDINGS_SAMSUNG_I2S_H */
--
1.7.9.5
--
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