From 4528d92a0ea8014a42526215872faf89c7a4c619 Mon Sep 17 00:00:00 2001 From: Erik Sejr Date: Tue, 7 Jun 2016 20:58:17 -0400 Subject: [PATCH] Add ads1015 overlay See: https://github.com/raspberrypi/linux/pull/1520 --- arch/arm/boot/dts/overlays/Makefile | 1 + arch/arm/boot/dts/overlays/README | 22 ++++++ arch/arm/boot/dts/overlays/ads1015-overlay.dts | 98 ++++++++++++++++++++++++++ 3 files changed, 121 insertions(+) create mode 100644 arch/arm/boot/dts/overlays/ads1015-overlay.dts --- a/arch/arm/boot/dts/overlays/Makefile +++ b/arch/arm/boot/dts/overlays/Makefile @@ -13,6 +13,7 @@ ifeq ($(CONFIG_ARCH_BCM2835),y) endif dtbo-$(RPI_DT_OVERLAYS) += adau1977-adc.dtbo +dtbo-$(RPI_DT_OVERLAYS) += ads1015.dtbo dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -168,6 +168,28 @@ Load: dtoverlay=adau1977-adc Params: +Name: ads1015 +Info: Overlay for activation of Texas Instruments ADS1015 ADC over I2C +Load: dtoverlay=ads1015,= +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. (default=true) + 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=4 sets 1600 sps) + cha_gain Set the gain of the Programmable Gain + Amplifier for this channel. (default=2 sets the + full scale of the channel to 2.048 Volts) + + Channel (ch) 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/ads1015.pdf + + Name: ads7846 Info: ADS7846 Touch controller Load: dtoverlay=ads7846,= --- /dev/null +++ b/arch/arm/boot/dts/overlays/ads1015-overlay.dts @@ -0,0 +1,98 @@ +/* + * 2016 - Erik Sejr + */ +/dts-v1/; +/plugin/; + +/ { + compatible = "brcm,bcm2708"; + /* ----------- ADS1015 ------------ */ + fragment@0 { + target = <&i2c_arm>; + __overlay__ { + #address-cells = <1>; + #size-cells = <0>; + status = "okay"; + ads1015: ads1015 { + compatible = "ti,ads1015"; + status = "okay"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0x48>; + }; + }; + }; + + fragment@1 { + target-path = "i2c_arm/ads1015"; + __overlay__ { + #address-cells = <1>; + #size-cells = <0>; + channel_a: channel_a { + reg = <4>; + ti,gain = <2>; + ti,datarate = <4>; + }; + }; + }; + + fragment@2 { + target-path = "i2c_arm/ads1015"; + __dormant__ { + #address-cells = <1>; + #size-cells = <0>; + channel_b: channel_b { + reg = <5>; + ti,gain = <2>; + ti,datarate = <4>; + }; + }; + }; + + fragment@3 { + target-path = "i2c_arm/ads1015"; + __dormant__ { + #address-cells = <1>; + #size-cells = <0>; + channel_c: channel_c { + reg = <6>; + ti,gain = <2>; + ti,datarate = <4>; + }; + }; + }; + + fragment@4 { + target-path = "i2c_arm/ads1015"; + __dormant__ { + #address-cells = <1>; + #size-cells = <0>; + channel_d: channel_d { + reg = <7>; + ti,gain = <2>; + ti,datarate = <4>; + }; + }; + }; + + __overrides__ { + addr = <&ads1015>,"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"; + }; + +};