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ARM: da850-lego-ev3: Add device tree node for sound

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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: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
David Lechner 2017-02-07 13:22:09 -06:00 committed by Sekhar Nori
parent 8a81ff173c
commit 7723d70beb
1 changed files with 31 additions and 0 deletions
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31
arch/arm/boot/dts/da850-lego-ev3.dts
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@ -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";
};