summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt')
-rw-r--r--Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt85
1 files changed, 85 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
new file mode 100644
index 000000000..c483dcec0
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
@@ -0,0 +1,85 @@
+Texas Instruments McASP controller
+
+Required properties:
+- compatible :
+ "ti,dm646x-mcasp-audio" : for DM646x platforms
+ "ti,da830-mcasp-audio" : for both DA830 & DA850 platforms
+ "ti,am33xx-mcasp-audio" : for AM33xx platforms (AM33xx, AM43xx, TI81xx)
+ "ti,dra7-mcasp-audio" : for DRA7xx platforms
+
+- reg : Should contain reg specifiers for the entries in the reg-names property.
+- reg-names : Should contain:
+ * "mpu" for the main registers (required). For compatibility with
+ existing software, it is recommended this is the first entry.
+ * "dat" for separate data port register access (optional).
+- op-mode : I2S/DIT ops mode. 0 for I2S mode. 1 for DIT mode used for S/PDIF,
+ IEC60958-1, and AES-3 formats.
+- tdm-slots : Slots for TDM operation. Indicates number of channels transmitted
+ or received over one serializer.
+- serial-dir : A list of serializer configuration. Each entry is a number
+ indication for serializer pin direction.
+ (0 - INACTIVE, 1 - TX, 2 - RX)
+- dmas: two element list of DMA controller phandles 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. The dma
+ identifiers must be "rx" and "tx".
+
+Optional properties:
+
+- ti,hwmods : Must be "mcasp<n>", n is controller instance starting 0
+- tx-num-evt : FIFO levels.
+- rx-num-evt : FIFO levels.
+- dismod : Specify the drive on TX pin during inactive slots
+ 0 : 3-state
+ 2 : logic low
+ 3 : logic high
+ Defaults to 'logic low' when the property is not present
+- sram-size-playback : size of sram to be allocated during playback
+- sram-size-capture : size of sram to be allocated during capture
+- interrupts : Interrupt numbers for McASP
+- interrupt-names : Known interrupt names are "tx" and "rx"
+- pinctrl-0: Should specify pin control group used for this controller.
+- pinctrl-names: Should contain only one value - "default", for more details
+ please refer to pinctrl-bindings.txt
+- fck_parent : Should contain a valid clock name which will be used as parent
+ for the McASP fck
+- auxclk-fs-ratio: When McASP is bus master indicates the ratio between AUCLK
+ and FS rate if applicable:
+ AUCLK rate = auxclk-fs-ratio * FS rate
+
+Optional GPIO support:
+If any McASP pin need to be used as GPIO then the McASP node must have:
+...
+ gpio-controller
+ #gpio-cells = <2>;
+...
+
+When requesting a GPIO, the first parameter is the PIN index in McASP_P*
+registers.
+For example to request the AXR2 pin of mcasp8:
+function-gpios = <&mcasp8 2 0>;
+
+Or to request the ACLKR pin of mcasp8:
+function-gpios = <&mcasp8 29 0>;
+
+For generic gpio information, please refer to bindings/gpio/gpio.txt
+
+Example:
+
+mcasp0: mcasp0@1d00000 {
+ compatible = "ti,da830-mcasp-audio";
+ reg = <0x100000 0x3000>;
+ reg-names "mpu";
+ interrupts = <82>, <83>;
+ interrupt-names = "tx", "rx";
+ op-mode = <0>; /* MCASP_IIS_MODE */
+ tdm-slots = <2>;
+ serial-dir = <
+ 0 0 0 0 /* 0: INACTIVE, 1: TX, 2: RX */
+ 0 0 0 0
+ 0 0 0 1
+ 2 0 0 0 >;
+ tx-num-evt = <1>;
+ rx-num-evt = <1>;
+};