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Commit c821d301 authored by Peter Rosin's avatar Peter Rosin Committed by Mark Brown
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ASoC: tse850: document axentia,tse850-pcm5142 bindings 



The TSE-850 is an FM Transmitter Station Equipment, designed to generate
baseband signals for FM, mainly the DARC subcarrier, but other signals
are also possible.

Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a85787ed

Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt

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Devicetree bindings for the Axentia TSE-850 audio complex



Required properties:

  - compatible: "axentia,tse850-pcm5142"

  - axentia,ssc-controller: The phandle of the atmel SSC controller used as

    cpu dai.

  - axentia,audio-codec: The phandle of the PCM5142 codec.

  - axentia,add-gpios: gpio specifier that controls the mixer.

  - axentia,loop1-gpios: gpio specifier that controls loop relays on channel 1.

  - axentia,loop2-gpios: gpio specifier that controls loop relays on channel 2.

  - axentia,ana-supply: Regulator that supplies the output amplifier. Must

    support voltages in the 2V - 20V range, in 1V steps.



The schematics explaining the gpios are as follows:



               loop1 relays

   IN1 +---o  +------------+  o---+ OUT1

            \                /

             +              +

             |   /          |

             +--o  +--.     |

             |  add   |     |

             |        V     |

             |      .---.   |

   DAC +----------->|Sum|---+

             |      '---'   |

             |              |

             +              +



   IN2 +---o--+------------+--o---+ OUT2

               loop2 relays



The 'loop1' gpio pin controlls two relays, which are either in loop position,

meaning that input and output are directly connected, or they are in mixer

position, meaning that the signal is passed through the 'Sum' mixer. Similarly

for 'loop2'.



In the above, the 'loop1' relays are inactive, thus feeding IN1 to the mixer

(if 'add' is active) and feeding the mixer output to OUT1. The 'loop2' relays

are active, short-cutting the TSE-850 from channel 2. IN1, IN2, OUT1 and OUT2

are TSE-850 connectors and DAC is the PCB name of the (filtered) output from

the PCM5142 codec.



Example:



	&i2c {

		codec: pcm5142@4c {

			compatible = "ti,pcm5142";



			reg = <0x4c>;



			AVDD-supply = <&reg_3v3>;

			DVDD-supply = <&reg_3v3>;

			CPVDD-supply = <&reg_3v3>;



			clocks = <&sck>;



			pll-in = <3>;

			pll-out = <6>;

		};

	};



	ana: ana-reg {

		compatible = "pwm-regulator";



		regulator-name = "ANA";



		pwms = <&pwm0 2 1000 PWM_POLARITY_INVERTED>;

		pwm-dutycycle-unit = <1000>;

		pwm-dutycycle-range = <100 1000>;



		regulator-min-microvolt = <2000000>;

		regulator-max-microvolt = <20000000>;

		regulator-ramp-delay = <1000>;

	};



	sound {

		compatible = "axentia,tse850-pcm5142";



		axentia,ssc-controller = <&ssc0>;

		axentia,audio-codec = <&codec>;



		axentia,add-gpios = <&pioA 8 GPIO_ACTIVE_LOW>;

		axentia,loop1-gpios = <&pioA 10 GPIO_ACTIVE_LOW>;

		axentia,loop2-gpios = <&pioA 11 GPIO_ACTIVE_LOW>;



		axentia,ana-supply = <&ana>;

	};

MAINTAINERS

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@@ -2317,6 +2317,12 @@ F: include/uapi/linux/ax25.h 
F:	include/net/ax25.h

F:	net/ax25/



AXENTIA ASOC DRIVERS

M:	Peter Rosin <peda@axentia.se>

L:	alsa-devel@alsa-project.org (moderated for non-subscribers)

S:	Maintained

F:	Documentation/devicetree/bindings/sound/axentia,*



AZ6007 DVB DRIVER

M:	Mauro Carvalho Chehab <mchehab@s-opensource.com>

M:	Mauro Carvalho Chehab <mchehab@kernel.org>