ASoC: samsung: i2s: Add clk provider DT binding documentation

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@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sylwester Nawrocki 2015-01-14 19:42:38 +01:00 committed by Mark Brown
parent ecb400cabb
commit 0d40c61279
2 changed files with 30 additions and 0 deletions

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@ -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>;

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@ -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 */