ad7771-mcasp08.dtsi

#include "bone/black.h"

// pinout option 1 (conflicts with HDMI audio):
//
//	ad7771	mcasp	muxmode	pin
//	------	-----	-------	---------------
//	dclk	clk	0	P9_31
//	drdy	fs	0	P9_29
//	dout0	d0	0	P9_30
//	dout1	d1	0	P9_41b
//	dout2	d2	2	P9_42b or P9_28
//	dout3	d3	2	P9_27  or P9_25
//
// pinout option 2 (conflicts with HDMI entirely):
//
//	ad7771	mcasp	muxmode	pin
//	------	-----	-------	--------------
//	dclk	clk	3	P8_37
//	drdy	fs	3	P8_38
//	dout0	d0	3	P8_36
//	dout1	d1	3	P8_31
//	dout2	d2	4	P8_34 or P8_35
//	dout3	d3	4	P8_33 or P8_32

// note: P9.41 and P9.42 both connect to two processor pins each, which
// cape-universal calls P9_41/42 and P9_91/92 respectively.
USES_PIN(P8_37);
USES_PIN(P8_38);
USES_PIN(P8_36);
USES_PIN(P8_31);
USES_PIN(P8_34);
USES_PIN(P8_33);

&mcasp0 {
	status = "okay";

	#sound-dai-cells = <0>;  // XXX this ought to be in the base dts

	pinctrl-names = "default";
	pinctrl-0 = <&asp0_pins>;

	// data pins (0 = unused, 1 = tx, 2 = rx)
	serial-dir = <2 2 2 2>;

	// data slots (= channels per pin)
	tdm-slots = <2>;

	// dma fifo levels
	tx-num-evt = <32>;
	rx-num-evt = <32>;
};

&am33xx_pinmux {
	asp0_pins: asp0 {
		pinctrl-single,pins = <
			PIN_PULLUP( P8_37,  3 )  // clk
			PIN_PULLDN( P8_38,  3 )  // fs
			PIN_PULLDN( P8_36,  3 )  // d0
			PIN_PULLDN( P8_31, 	3 )  // d1
			PIN_PULLDN( P8_34, 	4 )  // d2
			PIN_PULLDN( P8_33,  4 )  // d3

		>;
	};
};

/ {
	ad7771_dai: ad7771-dai {
#if 0
		// XXX driver is not in rcn's kernel tree
		compatible = "linux,tdm-audio";
		#sound-dai-cells = <0>;

		capture {
			input-widget-name = "From AD7771";
			channels = <8>;
			rates = <128000>;
			samplebits = <32>;
		};
#else
		// XXX this codec driver accept basically any format and
		// configuration, so it's up to userspace to make sure to
		// select the correct samplerate, format, and number of channels
		compatible = "linux,spdif-dir";
		#sound-dai-cells = <0>;
#endif
	};

	ad7771-card {
		compatible = "simple-audio-card";
		simple-audio-card,name = "AD7771";

		simple-audio-card,dai-link@0 {
			format = "dsp_a";
			bitclock-inversion;
			frame-master = <&ad7771_tx_master>;
			bitclock-master = <&ad7771_tx_master>;

			cpu {
				sound-dai = <&mcasp0>;
				dai-tdm-slot-width = <32>;
				dai-tdm-slot-num = <2>;
			};

			ad7771_tx_master: codec {
				sound-dai = <&ad7771_dai>;
				// is any clock spec needed?
			};
		};
	};
};