Add overlay for ads1115 ADCs (#1864)

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index c8825365a4129b0098abf2002e1dcd936ea1ec8c..c890e5ddb0e2eec982597a851023b539d318d6ce 100644 (file)
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -4,6 +4,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
        adau1977-adc.dtbo \
        adau7002-simple.dtbo \
        ads1015.dtbo \
+       ads1115.dtbo \
        ads7846.dtbo \
        akkordion-iqdacplus.dtbo \
        allo-piano-dac-pcm512x-audio.dtbo \

diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 788e9e3b23f37d4c44b94b60ff2b72e2f0dbeeac..970c9c9b5c74467a3014a77039fa765d8f8c4e6f 100644 (file)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -196,6 +196,28 @@ Params: addr                    I2C bus address of device. Set based on how the
         http://www.ti.com/lit/ds/symlink/ads1015.pdf
 
 
+Name:   ads1115
+Info:   Texas Instruments ADS1115 ADC
+Load:   dtoverlay=ads1115,<param>[=<val>]
+Params: addr                    I2C bus address of device. Set based on how the
+                                addr pin is wired. (default=0x48 assumes addr
+                                is pulled to GND)
+        cha_enable              Enable virtual channel a.
+        cha_cfg                 Set the configuration for virtual channel a.
+                                (default=4 configures this channel for the
+                                voltage at A0 with respect to GND)
+        cha_datarate            Set the datarate (samples/sec) for this channel.
+                                (default=7 sets 860 sps)
+        cha_gain                Set the gain of the Programmable Gain
+                                Amplifier for this channel. (Default 1 sets the
+                                full scale of the channel to 4.096 Volts)
+
+        Channel parameters can be set for each enabled channel.
+        A maximum of 4 channels can be enabled (letters a thru d).
+        For more information refer to the device datasheet at:
+        http://www.ti.com/lit/ds/symlink/ads1115.pdf
+
+
 Name:   ads7846
 Info:   ADS7846 Touch controller
 Load:   dtoverlay=ads7846,<param>=<val>

diff --git a/arch/arm/boot/dts/overlays/ads1115-overlay.dts b/arch/arm/boot/dts/overlays/ads1115-overlay.dts
new file mode 100644 (file)
index 0000000..7c16a1a
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/ads1115-overlay.dts
@@ -0,0 +1,103 @@
+/*
+ * TI ADS1115 multi-channel ADC overlay
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+       compatible = "brcm,bcm2708";
+
+       fragment@0 {
+               target = <&i2c_arm>;
+               __overlay__ {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       status = "okay";
+
+                       ads1115: ads1115 {
+                               compatible = "ti,ads1115";
+                               status = "okay";
+                               #address-cells = <1>;
+                               #size-cells = <0>;
+                               reg = <0x48>;
+                       };
+               };
+       };
+
+       fragment@1 {
+               target-path = "i2c_arm/ads1115";
+               __dormant__ {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel_a: channel_a {
+                               reg = <4>;
+                               ti,gain = <1>;
+                               ti,datarate = <7>;
+                       };
+               };
+       };
+
+       fragment@2 {
+               target-path = "i2c_arm/ads1115";
+               __dormant__ {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel_b: channel_b {
+                               reg = <5>;
+                               ti,gain = <1>;
+                               ti,datarate = <7>;
+                       };
+               };
+       };
+
+       fragment@3 {
+               target-path = "i2c_arm/ads1115";
+               __dormant__ {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel_c: channel_c {
+                               reg = <6>;
+                               ti,gain = <1>;
+                               ti,datarate = <7>;
+                       };
+               };
+       };
+
+       fragment@4 {
+               target-path = "i2c_arm/ads1115";
+               __dormant__ {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel_d: channel_d {
+                               reg = <7>;
+                               ti,gain = <1>;
+                               ti,datarate = <7>;
+                       };
+               };
+       };
+
+       __overrides__ {
+               addr =            <&ads1115>,"reg:0";
+               cha_enable =      <0>,"=1";
+               cha_cfg =         <&channel_a>,"reg:0";
+               cha_gain =        <&channel_a>,"ti,gain:0";
+               cha_datarate =    <&channel_a>,"ti,datarate:0";
+               chb_enable =      <0>,"=2";
+               chb_cfg =         <&channel_b>,"reg:0";
+               chb_gain =        <&channel_b>,"ti,gain:0";
+               chb_datarate =    <&channel_b>,"ti,datarate:0";
+               chc_enable =      <0>,"=3";
+               chc_cfg =         <&channel_c>,"reg:0";
+               chc_gain =        <&channel_c>,"ti,gain:0";
+               chc_datarate =    <&channel_c>,"ti,datarate:0";
+               chd_enable =      <0>,"=4";
+               chd_cfg =         <&channel_d>,"reg:0";
+               chd_gain =        <&channel_d>,"ti,gain:0";
+               chd_datarate =    <&channel_d>,"ti,datarate:0";
+       };
+};