86 lines
2.0 KiB
Diff
86 lines
2.0 KiB
Diff
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From 7723d70bebd749ef24fef19db52d827c7fd7f858 Mon Sep 17 00:00:00 2001
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From: David Lechner <david@lechnology.com>
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Date: Tue, 7 Feb 2017 13:22:09 -0600
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Subject: 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
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uses one of the SoC PWMs connected to an amplifier to create sound from
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a speaker.
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The PWM is passed through a low-pass filter, so it is actually possible
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to do PCM playback, but there is no existing driver, so just using
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pwm-beeper for now, since it is also a compatible mode of operation.
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Signed-off-by: David Lechner <david@lechnology.com>
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Signed-off-by: Sekhar Nori <nsekhar@ti.com>
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---
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arch/arm/boot/dts/da850-lego-ev3.dts | 31 +++++++++++++++++++++++++++++++
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1 file changed, 31 insertions(+)
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diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts
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index 0309537..c20580a 100644
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--- a/arch/arm/boot/dts/da850-lego-ev3.dts
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+++ b/arch/arm/boot/dts/da850-lego-ev3.dts
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@@ -123,6 +123,14 @@
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pinctrl-0 = <&system_power_pin>;
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};
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+ sound {
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+ compatible = "pwm-beeper";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&ehrpwm0b_pins>;
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+ pwms = <&ehrpwm0 1 1000000 0>;
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+ amp-supply = <&>;
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+ };
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+
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/*
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* This is a 5V current limiting regulator that is shared by USB,
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* the sensor (input) ports, the motor (output) ports and the A/DC.
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@@ -152,6 +160,18 @@
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regulator-boot-on;
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vin-supply = <&vcc5v>;
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};
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+
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+ /*
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+ * This is the amplifier for the speaker.
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+ */
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+ amp: regulator3 {
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&_pins>;
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+ compatible = "regulator-fixed";
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+ regulator-name = "amp";
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+ gpio = <&gpio 111 GPIO_ACTIVE_HIGH>;
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+ enable-active-high;
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+ };
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};
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&pmx_core {
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@@ -208,6 +228,13 @@
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0x4c 0x00008000 0x0000f000
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>;
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};
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+
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+ amp_pins: pinmux_amp_pins {
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+ pinctrl-single,bits = <
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+ /* GP6[15] */
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+ 0x34 0x00000008 0x0000000f
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+ >;
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+ };
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};
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&pinconf {
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@@ -316,6 +343,10 @@
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};
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};
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+&ehrpwm0 {
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+ status = "okay";
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+};
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+
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&gpio {
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status = "okay";
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};
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--
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cgit v1.1
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