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160 lines
4.4 KiB
Diff
160 lines
4.4 KiB
Diff
From 6d5e32067cf3f3169ec15097c175878de365d247 Mon Sep 17 00:00:00 2001
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From: Scott Ellis <scott@jumpnowtek.com>
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Date: Wed, 1 Mar 2017 07:22:24 -0500
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Subject: [PATCH] Add overlay for ads1115 ADCs (#1864)
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 22 ++++++
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arch/arm/boot/dts/overlays/ads1115-overlay.dts | 103 +++++++++++++++++++++++++
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3 files changed, 126 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/ads1115-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -4,6 +4,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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adau1977-adc.dtbo \
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adau7002-simple.dtbo \
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ads1015.dtbo \
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+ ads1115.dtbo \
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ads7846.dtbo \
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akkordion-iqdacplus.dtbo \
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allo-piano-dac-pcm512x-audio.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -196,6 +196,28 @@ Params: addr I2C bus
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http://www.ti.com/lit/ds/symlink/ads1015.pdf
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+Name: ads1115
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+Info: Texas Instruments ADS1115 ADC
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+Load: dtoverlay=ads1115,<param>[=<val>]
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+Params: addr I2C bus address of device. Set based on how the
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+ addr pin is wired. (default=0x48 assumes addr
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+ is pulled to GND)
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+ cha_enable Enable virtual channel a.
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+ cha_cfg Set the configuration for virtual channel a.
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+ (default=4 configures this channel for the
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+ voltage at A0 with respect to GND)
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+ cha_datarate Set the datarate (samples/sec) for this channel.
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+ (default=7 sets 860 sps)
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+ cha_gain Set the gain of the Programmable Gain
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+ Amplifier for this channel. (Default 1 sets the
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+ full scale of the channel to 4.096 Volts)
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+
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+ Channel parameters can be set for each enabled channel.
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+ A maximum of 4 channels can be enabled (letters a thru d).
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+ For more information refer to the device datasheet at:
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+ http://www.ti.com/lit/ds/symlink/ads1115.pdf
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+
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+
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Name: ads7846
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Info: ADS7846 Touch controller
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Load: dtoverlay=ads7846,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/ads1115-overlay.dts
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@@ -0,0 +1,103 @@
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+/*
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+ * TI ADS1115 multi-channel ADC overlay
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&i2c_arm>;
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ ads1115: ads1115 {
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+ compatible = "ti,ads1115";
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ reg = <0x48>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target-path = "i2c_arm/ads1115";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ channel_a: channel_a {
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+ reg = <4>;
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+ ti,gain = <1>;
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+ ti,datarate = <7>;
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+ };
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+ };
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+ };
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+
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+ fragment@2 {
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+ target-path = "i2c_arm/ads1115";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ channel_b: channel_b {
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+ reg = <5>;
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+ ti,gain = <1>;
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+ ti,datarate = <7>;
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+ };
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+ };
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+ };
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+
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+ fragment@3 {
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+ target-path = "i2c_arm/ads1115";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ channel_c: channel_c {
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+ reg = <6>;
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+ ti,gain = <1>;
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+ ti,datarate = <7>;
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+ };
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+ };
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+ };
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+
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+ fragment@4 {
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+ target-path = "i2c_arm/ads1115";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ channel_d: channel_d {
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+ reg = <7>;
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+ ti,gain = <1>;
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+ ti,datarate = <7>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ addr = <&ads1115>,"reg:0";
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+ cha_enable = <0>,"=1";
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+ cha_cfg = <&channel_a>,"reg:0";
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+ cha_gain = <&channel_a>,"ti,gain:0";
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+ cha_datarate = <&channel_a>,"ti,datarate:0";
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+ chb_enable = <0>,"=2";
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+ chb_cfg = <&channel_b>,"reg:0";
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+ chb_gain = <&channel_b>,"ti,gain:0";
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+ chb_datarate = <&channel_b>,"ti,datarate:0";
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+ chc_enable = <0>,"=3";
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+ chc_cfg = <&channel_c>,"reg:0";
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+ chc_gain = <&channel_c>,"ti,gain:0";
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+ chc_datarate = <&channel_c>,"ti,datarate:0";
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+ chd_enable = <0>,"=4";
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+ chd_cfg = <&channel_d>,"reg:0";
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+ chd_gain = <&channel_d>,"ti,gain:0";
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+ chd_datarate = <&channel_d>,"ti,datarate:0";
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+ };
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+};
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