summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt')
-rw-r--r--kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt82
1 files changed, 82 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt b/kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt
new file mode 100644
index 000000000..09e0e1859
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/sound/samsung-i2s.txt
@@ -0,0 +1,82 @@
+* Samsung I2S controller
+
+Required SoC Specific Properties:
+
+- compatible : should be one of the following.
+ - samsung,s3c6410-i2s: for 8/16/24bit stereo I2S.
+ - samsung,s5pv210-i2s: for 8/16/24bit multichannel(5.1) I2S with
+ secondary fifo, s/w reset control and internal mux for root clk src.
+ - samsung,exynos5420-i2s: for 8/16/24bit multichannel(5.1) I2S for
+ playback, sterio channel capture, secondary fifo using internal
+ or external dma, s/w reset control, internal mux for root clk src
+ and 7.1 channel TDM support for playback. TDM (Time division multiplexing)
+ is to allow transfer of multiple channel audio data on single data line.
+ - samsung,exynos7-i2s: with all the available features of exynos5 i2s,
+ exynos7 I2S has 7.1 channel TDM support for capture, secondary fifo
+ with only external dma and more no.of root clk sampling frequencies.
+ - samsung,exynos7-i2s1: I2S1 on previous samsung platforms supports
+ stereo channels. exynos7 i2s1 upgraded to 5.1 multichannel with
+ slightly modified bit offsets.
+
+- reg: physical base address of the controller and length of memory mapped
+ region.
+- dmas: list of DMA controller phandle and DMA request line ordered pairs.
+- dma-names: identifier string for each DMA request line in the dmas property.
+ These strings correspond 1:1 with the ordered pairs in dmas.
+- clocks: Handle to iis clock and RCLK source clk.
+- clock-names:
+ i2s0 uses some base clks from CMU and some are from audio subsystem internal
+ clock controller. The clock names for i2s0 should be "iis", "i2s_opclk0" and
+ "i2s_opclk1" as shown in the example below.
+ i2s1 and i2s2 uses clocks from CMU. The clock names for i2s1 and i2s2 should
+ be "iis" and "i2s_opclk0".
+ "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:
+
+- samsung,idma-addr: Internal DMA register base address of the audio
+ sub system(used in secondary sound source).
+- pinctrl-0: Should specify pin control groups used for this controller.
+- pinctrl-names: Should contain only one value - "default".
+
+
+Example:
+
+i2s0: i2s@03830000 {
+ compatible = "samsung,s5pv210-i2s";
+ reg = <0x03830000 0x100>;
+ dmas = <&pdma0 10
+ &pdma0 9
+ &pdma0 8>;
+ dma-names = "tx", "rx", "tx-sec";
+ clocks = <&clock_audss EXYNOS_I2S_BUS>,
+ <&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>;
+};