ASoC: sti: add binding for ASoC driver

STMicroelectronics sti ASoC cards

The sti ASoC Sound Card can be used, for all sti SoCs using internal sti-sas

codec or external codecs.

sti sound drivers allows to expose sti SoC audio interface through the

generic ASoC simple card. For details about sound card declaration please refer to

Documentation/devicetree/bindings/sound/simple-card.txt.

1) sti-uniperiph-dai: audio dai device.

---------------------------------------

Required properties:

  - compatible: "st,sti-uni-player" or "st,sti-uni-reader"

  - st,syscfg: phandle to boot-device system configuration registers

  - clock-names: name of the clocks listed in clocks property in the same order

  - reg: CPU DAI IP Base address and size entries, listed  in same

	 order than the CPU_DAI properties.

  - reg-names: names of the mapped memory regions listed in regs property in

	       the same order.

  - interrupts: CPU_DAI interrupt line, listed in the same order than the

		CPU_DAI properties.

  - dma: CPU_DAI DMA controller phandle and DMA request line, listed in the same

	 order than the CPU_DAI properties.

  - dma-names: identifier string for each DMA request line in the dmas property.

	"tx" for "st,sti-uni-player" compatibility

	"rx" for "st,sti-uni-reader" compatibility

  - version: IP version integrated in SOC.

  - dai-name: DAI name that describes the IP.

Required properties ("st,sti-uni-player" compatibility only):

  - clocks: CPU_DAI IP clock source, listed in the same order than the

	    CPU_DAI properties.

  - uniperiph-id: internal SOC IP instance ID.

  - IP mode: IP working mode depending on associated codec.

	"HDMI" connected to HDMI codec IP and IEC HDMI formats.

	"SPDIF"connected to SPDIF codec and support SPDIF formats.

	"PCM"  PCM standard mode for I2S or TDM bus.

Optional properties:

  - pinctrl-0: defined for CPU_DAI@1 and CPU_DAI@4 to describe I2S PIOs for

	       external codecs connection.

  - pinctrl-names: should contain only one value - "default".

Example:

	sti_uni_player2: sti-uni-player@2 {

		compatible = "st,sti-uni-player";

		status = "okay";

		#sound-dai-cells = <0>;

		st,syscfg = <&syscfg_core>;

		clocks = <&clk_s_d0_flexgen CLK_PCM_2>;

		reg = <0x8D82000 0x158>;

		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;

		dmas = <&fdma0 4 0 1>;

		dai-name = "Uni Player #1 (DAC)";

		dma-names = "tx";

		uniperiph-id = <2>;

		version = <5>;

		mode = "PCM";

	};

	sti_uni_player3: sti-uni-player@3 {

		compatible = "st,sti-uni-player";

		status = "okay";

		#sound-dai-cells = <0>;

		st,syscfg = <&syscfg_core>;

		clocks = <&clk_s_d0_flexgen CLK_SPDIFF>;

		reg = <0x8D85000 0x158>;

		interrupts = <GIC_SPI 89 IRQ_TYPE_NONE>;

		dmas = <&fdma0 7 0 1>;

		dma-names = "tx";

		dai-name = "Uni Player #1 (PIO)";

		uniperiph-id = <3>;

		version = <5>;

		mode = "SPDIF";

	};

	sti_uni_reader1: sti-uni-reader@1 {

		compatible = "st,sti-uni-reader";

		status = "disabled";

		#sound-dai-cells = <0>;

		st,syscfg = <&syscfg_core>;

		reg = <0x8D84000 0x158>;

		interrupts = <GIC_SPI 88 IRQ_TYPE_NONE>;

		dmas = <&fdma0 6 0 1>;

		dma-names = "rx";

		dai-name = "Uni Reader #1 (HDMI RX)";

		version = <3>;

	};

2) sti-sas-codec: internal audio codec IPs driver

-------------------------------------------------

Required properties:

  - compatible: "st,sti<chip>-sas-codec" .

	Should be chip "st,stih416-sas-codec" or "st,stih407-sas-codec"

  - st,syscfg: phandle to boot-device system configuration registers.

  - pinctrl-0: SPDIF PIO description.

  - pinctrl-names: should contain only one value - "default".

Example:

	sti_sas_codec: sti-sas-codec {

		compatible = "st,stih407-sas-codec";

		#sound-dai-cells = <1>;

		st,reg_audio = <&syscfg_core>;

		pinctrl-names = "default";

		pinctrl-0 = <&pinctrl_spdif_out >;

	};

Example of audio card declaration:

	sound {

		compatible = "simple-audio-card";

		simple-audio-card,name = "sti audio card";

		status = "okay";

		simple-audio-card,dai-link@0 {

			/* DAC */

			format = "i2s";

			dai-tdm-slot-width = <32>;

			cpu {

				sound-dai = <&sti_uni_player2>;

			};

			codec {

				sound-dai = <&sti_sasg_codec 1>;

			};

		};

		simple-audio-card,dai-link@1 {

			/* SPDIF */

			format = "left_j";

			cpu {

				sound-dai = <&sti_uni_player3>;

			};

			codec {

				sound-dai = <&sti_sasg_codec 0>;

			};

		};

	};