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156 lines
5.1 KiB
Diff
156 lines
5.1 KiB
Diff
From 940b863512662c2da10729fbb6d57fe072c9b887 Mon Sep 17 00:00:00 2001
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From: Erik Sejr <erik@eriks.ssimicro.com>
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Date: Tue, 7 Jun 2016 20:58:17 -0400
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Subject: [PATCH] Add ads1015 overlay
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See: https://github.com/raspberrypi/linux/pull/1520
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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/ads1015-overlay.dts | 98 ++++++++++++++++++++++++++
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3 files changed, 121 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/ads1015-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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@@ -13,6 +13,7 @@ ifeq ($(CONFIG_ARCH_BCM2835),y)
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endif
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dtbo-$(RPI_DT_OVERLAYS) += adau1977-adc.dtbo
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+dtbo-$(RPI_DT_OVERLAYS) += ads1015.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += at86rf233.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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@@ -168,6 +168,28 @@ Load: dtoverlay=adau1977-adc
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Params: <None>
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+Name: ads1015
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+Info: Overlay for activation of Texas Instruments ADS1015 ADC over I2C
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+Load: dtoverlay=ads1015,<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. (default=true)
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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=4 sets 1600 sps)
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+ cha_gain Set the gain of the Programmable Gain
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+ Amplifier for this channel. (default=2 sets the
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+ full scale of the channel to 2.048 Volts)
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+
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+ Channel (ch) 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/ads1015.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/ads1015-overlay.dts
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@@ -0,0 +1,98 @@
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+/*
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+ * 2016 - Erik Sejr
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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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+ /* ----------- ADS1015 ------------ */
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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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+ ads1015: ads1015 {
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+ compatible = "ti,ads1015";
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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/ads1015";
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ channel_a: channel_a {
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+ reg = <4>;
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+ ti,gain = <2>;
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+ ti,datarate = <4>;
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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/ads1015";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ channel_b: channel_b {
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+ reg = <5>;
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+ ti,gain = <2>;
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+ ti,datarate = <4>;
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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/ads1015";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ channel_c: channel_c {
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+ reg = <6>;
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+ ti,gain = <2>;
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+ ti,datarate = <4>;
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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/ads1015";
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ channel_d: channel_d {
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+ reg = <7>;
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+ ti,gain = <2>;
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+ ti,datarate = <4>;
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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 = <&ads1015>,"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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+};
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