From 7723d70bebd749ef24fef19db52d827c7fd7f858 Mon Sep 17 00:00:00 2001 From: David Lechner Date: Tue, 7 Feb 2017 13:22:09 -0600 Subject: [PATCH] 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: David Lechner Signed-off-by: Sekhar Nori --- arch/arm/boot/dts/da850-lego-ev3.dts | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts index 0309537..c20580a 100644 --- a/arch/arm/boot/dts/da850-lego-ev3.dts +++ b/arch/arm/boot/dts/da850-lego-ev3.dts @@ -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 = <&>; + }; + /* * 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 = <&_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"; }; -- 2.7.4