[PATCH 0/3] A/C and Sound device tree nodes for LEGO MINDSTORMS EV3

[PATCH 0/3] A/C and Sound device tree nodes for LEGO MINDSTORMS EV3

[David Lechner]

This series adds device tree nodes for an analog/digital convert and for sound
on LEGO MINDSTORMS EV3. The device tree bindings for these nodes have been acked
and the drivers used by these nodes have been in linux-next for a couple weeks
now and as far as I know, will be included in mainline v4.11.

This series has been tested on LEGO MINDSTORMS EV3 using next-20170207 merged
with linux-davinci/master.


David Lechner (3):
  ARM: da850-lego-ev3: Add device tree node for A/DC
  ARM: davinci_all_defconfig: Enable TI ADS7950
  ARM: da850-lego-ev3: Add device tree node for sound

 arch/arm/boot/dts/da850-lego-ev3.dts   | 52 ++++++++++++++++++++++++++++++++++
 arch/arm/configs/davinci_all_defconfig |  4 +--
 2 files changed, 53 insertions(+), 3 deletions(-)

-- 
2.7.4

[PATCH 1/3] ARM: da850-lego-ev3: Add device tree node for A/DC

[David Lechner]

This adds a node for the TI ADS7957 analog/digital converter on LEGO
MINDSTORMS EV3 as well as a regulator node that is used by the A/DC node.

Signed-off-by: David Lechner <david@lechnology.com>
---
 arch/arm/boot/dts/da850-lego-ev3.dts | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts
index 112ec92..0309537 100644
--- a/arch/arm/boot/dts/da850-lego-ev3.dts
+++ b/arch/arm/boot/dts/da850-lego-ev3.dts
@@ -139,6 +139,19 @@
 		enable-active-high;
 		regulator-boot-on;
 	};
+
+	/*
+	 * This is a simple voltage divider on VCC5V to provide a 2.5V
+	 * reference signal to the ADC.
+	 */
+	adc_ref: regulator2 {
+		compatible = "regulator-fixed";
+		regulator-name = "adc ref";
+		regulator-min-microvolt = <2500000>;
+		regulator-max-microvolt = <2500000>;
+		regulator-boot-on;
+		vin-supply = <&vcc5v>;
+	};
 };
 
 &pmx_core {
@@ -293,6 +306,14 @@
 			};
 		};
 	};
+
+	adc: adc@3 {
+		compatible = "ti,ads7957";
+		reg = <3>;
+		#io-channel-cells = <1>;
+		spi-max-frequency = <10000000>;
+		vref-supply = <&adc_ref>;
+	};
 };
 
 &gpio {
-- 
2.7.4

[PATCH 2/3] ARM: davinci_all_defconfig: Enable TI ADS7950

[David Lechner]

This enables the TI ADS7950 IIO driver. This is used on LEGO MINDSTORMS
EV3. The other IIO configs removed in this patch are selected by
CONFIG_TI_ADS7950, so they are not actually being desabled.

Signed-off-by: David Lechner <david@lechnology.com>
---
 arch/arm/configs/davinci_all_defconfig | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/arm/configs/davinci_all_defconfig b/arch/arm/configs/davinci_all_defconfig
index c8663ea..0a95fc4 100644
--- a/arch/arm/configs/davinci_all_defconfig
+++ b/arch/arm/configs/davinci_all_defconfig
@@ -204,12 +204,10 @@ CONFIG_MEMORY=y
 CONFIG_TI_AEMIF=m
 CONFIG_DA8XX_DDRCTL=y
 CONFIG_IIO=m
-CONFIG_IIO_BUFFER=y
 CONFIG_IIO_BUFFER_CB=m
-CONFIG_IIO_KFIFO_BUF=m
-CONFIG_IIO_TRIGGER=y
 CONFIG_IIO_SW_DEVICE=m
 CONFIG_IIO_SW_TRIGGER=m
+CONFIG_TI_ADS7950=m
 CONFIG_IIO_HRTIMER_TRIGGER=m
 CONFIG_IIO_SYSFS_TRIGGER=m
 CONFIG_PWM=y
-- 
2.7.4

[PATCH 3/3] ARM: da850-lego-ev3: Add device tree node for sound

[David Lechner]

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>
---
 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 = <&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";
 };
-- 
2.7.4

Re: [PATCH 0/3] A/C and Sound device tree nodes for LEGO MINDSTORMS EV3

[Sekhar Nori]

On Wednesday 08 February 2017 12:52 AM, David Lechner wrote:
> This series adds device tree nodes for an analog/digital convert and for sound
> on LEGO MINDSTORMS EV3. The device tree bindings for these nodes have been acked
> and the drivers used by these nodes have been in linux-next for a couple weeks
> now and as far as I know, will be included in mainline v4.11.
> 
> This series has been tested on LEGO MINDSTORMS EV3 using next-20170207 merged
> with linux-davinci/master.

Looks good to me. Will wait for device tree maintainers. And also for
v4.11-rc1 to come out.

Thanks,
Sekhar
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Re: [PATCH 0/3] A/C and Sound device tree nodes for LEGO MINDSTORMS EV3

[Sekhar Nori]

On Monday 20 February 2017 04:06 PM, Sekhar Nori wrote:
> On Wednesday 08 February 2017 12:52 AM, David Lechner wrote:
>> This series adds device tree nodes for an analog/digital convert and for sound
>> on LEGO MINDSTORMS EV3. The device tree bindings for these nodes have been acked
>> and the drivers used by these nodes have been in linux-next for a couple weeks
>> now and as far as I know, will be included in mainline v4.11.
>>
>> This series has been tested on LEGO MINDSTORMS EV3 using next-20170207 merged
>> with linux-davinci/master.
> 
> Looks good to me. Will wait for device tree maintainers. And also for
> v4.11-rc1 to come out.

Applied now.

Thanks,
Sekhar