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Commit 7723d70b authored by David Lechner's avatar David Lechner Committed by Sekhar Nori
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ARM: da850-lego-ev3: Add device tree node for sound 



This adds a device tree node for sound on LEGO MINDSTORMS EV3. The EV3
uses one of the SoC PWMs connected to an amplifier to create sound from
a speaker.

The PWM is passed through a low-pass filter, so it is actually possible
to do PCM playback, but there is no existing driver, so just using
pwm-beeper for now, since it is also a compatible mode of operation.

Signed-off-by: default avatarDavid Lechner <david@lechnology.com>
Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
parent 8a81ff17

arch/arm/boot/dts/da850-lego-ev3.dts

+31 −0
Original line number Diff line number Diff line
@@ -123,6 +123,14 @@ 
		pinctrl-0 = <&system_power_pin>;

	};



	sound {

		compatible = "pwm-beeper";

		pinctrl-names = "default";

		pinctrl-0 = <&ehrpwm0b_pins>;

		pwms = <&ehrpwm0 1 1000000 0>;

		amp-supply = <&amp>;

	};



	/*

	 * This is a 5V current limiting regulator that is shared by USB,

	 * the sensor (input) ports, the motor (output) ports and the A/DC.
@@ -152,6 +160,18 @@ 
		regulator-boot-on;

		vin-supply = <&vcc5v>;

	};



	/*

	 * This is the amplifier for the speaker.

	 */

	amp: regulator3 {

		pinctrl-names = "default";

		pinctrl-0 = <&amp_pins>;

		compatible = "regulator-fixed";

		regulator-name = "amp";

		gpio = <&gpio 111 GPIO_ACTIVE_HIGH>;

		enable-active-high;

	};

};



&pmx_core {
@@ -208,6 +228,13 @@ 
			0x4c 0x00008000 0x0000f000

		>;

	};



	amp_pins: pinmux_amp_pins {

		pinctrl-single,bits = <

			/* GP6[15] */

			0x34 0x00000008 0x0000000f

		>;

	};

};



&pinconf {
@@ -316,6 +343,10 @@ 
	};

};



&ehrpwm0 {

	status = "okay";

};



&gpio {

	status = "okay";

};