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<title>Codec Interface</title> | ||
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<note> | ||
<title>Suspended</title> | ||
<para>A V4L2 codec can compress, decompress, transform, or otherwise | ||
convert video data from one format into another format, in memory. Typically | ||
such devices are memory-to-memory devices (i.e. devices with the | ||
<constant>V4L2_CAP_VIDEO_M2M</constant> or <constant>V4L2_CAP_VIDEO_M2M_MPLANE</constant> | ||
capability set). | ||
</para> | ||
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<para>This interface has been be suspended from the V4L2 API | ||
implemented in Linux 2.6 until we have more experience with codec | ||
device interfaces.</para> | ||
</note> | ||
<para>A memory-to-memory video node acts just like a normal video node, but it | ||
supports both output (sending frames from memory to the codec hardware) and | ||
capture (receiving the processed frames from the codec hardware into memory) | ||
stream I/O. An application will have to setup the stream | ||
I/O for both sides and finally call &VIDIOC-STREAMON; for both capture and output | ||
to start the codec.</para> | ||
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<para>A V4L2 codec can compress, decompress, transform, or otherwise | ||
convert video data from one format into another format, in memory. | ||
Applications send data to be converted to the driver through a | ||
&func-write; call, and receive the converted data through a | ||
&func-read; call. For efficiency a driver may also support streaming | ||
I/O.</para> | ||
<para>Video compression codecs use the MPEG controls to setup their codec parameters | ||
(note that the MPEG controls actually support many more codecs than just MPEG). | ||
See <xref linkend="mpeg-controls"></xref>.</para> | ||
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<para>[to do]</para> | ||
<para>Memory-to-memory devices can often be used as a shared resource: you can | ||
open the video node multiple times, each application setting up their own codec properties | ||
that are local to the file handle, and each can use it independently from the others. | ||
The driver will arbitrate access to the codec and reprogram it whenever another file | ||
handler gets access. This is different from the usual video node behavior where the video properties | ||
are global to the device (i.e. changing something through one file handle is visible | ||
through another file handle).</para> |
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Wolfson Arizona class audio SoCs | ||
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These devices are audio SoCs with extensive digital capabilites and a range | ||
of analogue I/O. | ||
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Required properties: | ||
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- compatible : one of the following chip-specific strings: | ||
"wlf,wm5102" | ||
"wlf,wm5110" | ||
- reg : I2C slave address when connected using I2C, chip select number when | ||
using SPI. | ||
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- interrupts : The interrupt line the /IRQ signal for the device is | ||
connected to. | ||
- interrupt-controller : Arizona class devices contain interrupt controllers | ||
and may provide interrupt services to other devices. | ||
- interrupt-parent : The parent interrupt controller. | ||
- #interrupt-cells: the number of cells to describe an IRQ, this should be 2. | ||
The first cell is the IRQ number. | ||
The second cell is the flags, encoded as the trigger masks from | ||
Documentation/devicetree/bindings/interrupts.txt | ||
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- gpio-controller : Indicates this device is a GPIO controller. | ||
- #gpio-cells : Must be 2. The first cell is the pin number and the | ||
second cell is used to specify optional parameters (currently unused). | ||
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- AVDD1-supply, DBVDD1-supply, DBVDD2-supply, DBVDD3-supply, CPVDD-supply, | ||
SPKVDDL-supply, SPKVDDR-supply : power supplies for the device, as covered | ||
in Documentation/devicetree/bindings/regulator/regulator.txt | ||
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Optional properties: | ||
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- wlf,reset : GPIO specifier for the GPIO controlling /RESET | ||
- wlf,ldoena : GPIO specifier for the GPIO controlling LDOENA | ||
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- wlf,gpio-defaults : A list of GPIO configuration register values. If | ||
absent, no configuration of these registers is performed. If any | ||
entry has a value that is out of range for a 16 bit register then | ||
the chip default will be used. If present exactly five values must | ||
be specified. | ||
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Example: | ||
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codec: wm5102@1a { | ||
compatible = "wlf,wm5102"; | ||
reg = <0x1a>; | ||
interrupts = <347>; | ||
#interrupt-cells = <2>; | ||
interrupt-parent = <&gic>; | ||
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gpio-controller; | ||
#gpio-cells = <2>; | ||
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wlf,gpio-defaults = < | ||
0x00000000, /* AIF1TXLRCLK */ | ||
0xffffffff, | ||
0xffffffff, | ||
0xffffffff, | ||
0xffffffff, | ||
>; | ||
}; |
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Analog Devices ADAU1701 | ||
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Required properties: | ||
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- compatible: Should contain "adi,adau1701" | ||
- reg: The i2c address. Value depends on the state of ADDR0 | ||
and ADDR1, as wired in hardware. | ||
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Optional properties: | ||
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- reset-gpio: A GPIO spec to define which pin is connected to the | ||
chip's !RESET pin. If specified, the driver will | ||
assert a hardware reset at probe time. | ||
- adi,pll-mode-gpios: An array of two GPIO specs to describe the GPIOs | ||
the ADAU's PLL config pins are connected to. | ||
The state of the pins are set according to the | ||
configured clock divider on ASoC side before the | ||
firmware is loaded. | ||
- adi,pin-config: An array of 12 numerical values selecting one of the | ||
pin configurations as described in the datasheet, | ||
table 53. Note that the value of this property has | ||
to be prefixed with '/bits/ 8'. | ||
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Examples: | ||
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i2c_bus { | ||
adau1701@34 { | ||
compatible = "adi,adau1701"; | ||
reg = <0x34>; | ||
reset-gpio = <&gpio 23 0>; | ||
adi,pll-mode-gpios = <&gpio 24 0 &gpio 25 0>; | ||
adi,pin-config = /bits/ 8 <0x4 0x7 0x5 0x5 0x4 0x4 | ||
0x4 0x4 0x4 0x4 0x4 0x4>; | ||
}; | ||
}; |
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Documentation/devicetree/bindings/sound/imx-audio-wm8962.txt
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Freescale i.MX audio complex with WM8962 codec | ||
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Required properties: | ||
- compatible : "fsl,imx-audio-wm8962" | ||
- model : The user-visible name of this sound complex | ||
- ssi-controller : The phandle of the i.MX SSI controller | ||
- audio-codec : The phandle of the WM8962 audio codec | ||
- audio-routing : A list of the connections between audio components. | ||
Each entry is a pair of strings, the first being the connection's sink, | ||
the second being the connection's source. Valid names could be power | ||
supplies, WM8962 pins, and the jacks on the board: | ||
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Power supplies: | ||
* Mic Bias | ||
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Board connectors: | ||
* Mic Jack | ||
* Headphone Jack | ||
* Ext Spk | ||
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- mux-int-port : The internal port of the i.MX audio muxer (AUDMUX) | ||
- mux-ext-port : The external port of the i.MX audio muxer | ||
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Note: The AUDMUX port numbering should start at 1, which is consistent with | ||
hardware manual. | ||
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Example: | ||
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sound { | ||
compatible = "fsl,imx6q-sabresd-wm8962", | ||
"fsl,imx-audio-wm8962"; | ||
model = "wm8962-audio"; | ||
ssi-controller = <&ssi2>; | ||
audio-codec = <&codec>; | ||
audio-routing = | ||
"Headphone Jack", "HPOUTL", | ||
"Headphone Jack", "HPOUTR", | ||
"Ext Spk", "SPKOUTL", | ||
"Ext Spk", "SPKOUTR", | ||
"MICBIAS", "AMIC", | ||
"IN3R", "MICBIAS", | ||
"DMIC", "MICBIAS", | ||
"DMICDAT", "DMIC"; | ||
mux-int-port = <2>; | ||
mux-ext-port = <3>; | ||
}; |
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71 changes: 71 additions & 0 deletions
71
Documentation/devicetree/bindings/sound/nvidia,tegra-audio-rt5640.txt
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NVIDIA Tegra audio complex, with RT5640 CODEC | ||
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Required properties: | ||
- compatible : "nvidia,tegra-audio-rt5640" | ||
- clocks : Must contain an entry for each entry in clock-names. | ||
- clock-names : Must include the following entries: | ||
"pll_a" (The Tegra clock of that name), | ||
"pll_a_out0" (The Tegra clock of that name), | ||
"mclk" (The Tegra cdev1/extern1 clock, which feeds the CODEC's mclk) | ||
- nvidia,model : The user-visible name of this sound complex. | ||
- nvidia,audio-routing : A list of the connections between audio components. | ||
Each entry is a pair of strings, the first being the connection's sink, | ||
the second being the connection's source. Valid names for sources and | ||
sinks are the RT5640's pins, and the jacks on the board: | ||
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RT5640 pins: | ||
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* DMIC1 | ||
* DMIC2 | ||
* MICBIAS1 | ||
* IN1P | ||
* IN1R | ||
* IN2P | ||
* IN2R | ||
* HPOL | ||
* HPOR | ||
* LOUTL | ||
* LOUTR | ||
* MONOP | ||
* MONON | ||
* SPOLP | ||
* SPOLN | ||
* SPORP | ||
* SPORN | ||
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Board connectors: | ||
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* Headphones | ||
* Speakers | ||
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- nvidia,i2s-controller : The phandle of the Tegra I2S controller that's | ||
connected to the CODEC. | ||
- nvidia,audio-codec : The phandle of the RT5640 audio codec. This binding | ||
assumes that AIF1 on the CODEC is connected to Tegra. | ||
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Optional properties: | ||
- nvidia,hp-det-gpios : The GPIO that detects headphones are plugged in | ||
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Example: | ||
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sound { | ||
compatible = "nvidia,tegra-audio-rt5640-dalmore", | ||
"nvidia,tegra-audio-rt5640"; | ||
nvidia,model = "NVIDIA Tegra Dalmore"; | ||
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nvidia,audio-routing = | ||
"Headphones", "HPOR", | ||
"Headphones", "HPOL", | ||
"Speakers", "SPORP", | ||
"Speakers", "SPORN", | ||
"Speakers", "SPOLP", | ||
"Speakers", "SPOLN"; | ||
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nvidia,i2s-controller = <&tegra_i2s1>; | ||
nvidia,audio-codec = <&rt5640>; | ||
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nvidia,hp-det-gpios = <&gpio 143 0>; /* GPIO PR7 */ | ||
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clocks = <&tegra_car 216>, <&tegra_car 217>, <&tegra_car 120>; | ||
clock-names = "pll_a", "pll_a_out0", "mclk"; | ||
}; |
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RT5640 audio CODEC | ||
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This device supports I2C only. | ||
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Required properties: | ||
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- compatible : "realtek,rt5640". | ||
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- reg : The I2C address of the device. | ||
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- interrupts : The CODEC's interrupt output. | ||
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Optional properties: | ||
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- realtek,in1-differential | ||
- realtek,in2-differential | ||
Boolean. Indicate MIC1/2 input are differential, rather than single-ended. | ||
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- realtek,ldo1-en-gpios : The GPIO that controls the CODEC's LDO1_EN pin. | ||
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Example: | ||
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rt5640 { | ||
compatible = "realtek,rt5640"; | ||
reg = <0x1c>; | ||
interrupt-parent = <&gpio>; | ||
interrupts = <TEGRA_GPIO(W, 3) GPIO_ACTIVE_HIGH>; | ||
realtek,ldo1-en-gpios = | ||
<&gpio TEGRA_GPIO(V, 3) GPIO_ACTIVE_HIGH>; | ||
}; |
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10 changes: 10 additions & 0 deletions
10
Documentation/devicetree/bindings/sound/spdif-receiver.txt
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Device-Tree bindings for dummy spdif receiver | ||
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Required properties: | ||
- compatible: should be "linux,spdif-dir". | ||
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Example node: | ||
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codec: spdif-receiver { | ||
compatible = "linux,spdif-dir"; | ||
}; |
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Documentation/devicetree/bindings/sound/spdif-transmitter.txt
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Device-Tree bindings for dummy spdif transmitter | ||
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Required properties: | ||
- compatible: should be "linux,spdif-dit". | ||
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Example node: | ||
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codec: spdif-transmitter { | ||
compatible = "linux,spdif-dit"; | ||
}; |
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SSM2518 audio amplifier | ||
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This device supports I2C only. | ||
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Required properties: | ||
- compatible : Must be "adi,ssm2518" | ||
- reg : the I2C address of the device. This will either be 0x34 (ADDR pin low) | ||
or 0x35 (ADDR pin high) | ||
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Optional properties: | ||
- gpios : GPIO connected to the nSD pin. If the property is not present it is | ||
assumed that the nSD pin is hardwired to always on. | ||
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Example: | ||
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ssm2518: ssm2518@34 { | ||
compatible = "adi,ssm2518"; | ||
reg = <0x34>; | ||
gpios = <&gpio 5 0>; | ||
}; |
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