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c0046867f3
Configuration for ads1015 gain and datarate is possible via devicetree or platform data. This is a followup patch to previous ads1015 patches on Jean Delvares tree. Signed-off-by: Dirk Eibach <eibach@gdsys.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
74 lines
1.6 KiB
Plaintext
74 lines
1.6 KiB
Plaintext
ADS1015 (I2C)
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This device is a 12-bit A-D converter with 4 inputs.
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The inputs can be used single ended or in certain differential combinations.
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For configuration all possible combinations are mapped to 8 channels:
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0: Voltage over AIN0 and AIN1.
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1: Voltage over AIN0 and AIN3.
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2: Voltage over AIN1 and AIN3.
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3: Voltage over AIN2 and AIN3.
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4: Voltage over AIN0 and GND.
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5: Voltage over AIN1 and GND.
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6: Voltage over AIN2 and GND.
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7: Voltage over AIN3 and GND.
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Each channel can be configured individually:
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- pga is the programmable gain amplifier (values are full scale)
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0: +/- 6.144 V
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1: +/- 4.096 V
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2: +/- 2.048 V (default)
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3: +/- 1.024 V
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4: +/- 0.512 V
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5: +/- 0.256 V
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- data_rate in samples per second
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0: 128
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1: 250
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2: 490
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3: 920
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4: 1600 (default)
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5: 2400
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6: 3300
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1) The /ads1015 node
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Required properties:
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- compatible : must be "ti,ads1015"
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- reg : I2C bus address of the device
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- #address-cells : must be <1>
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- #size-cells : must be <0>
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The node contains child nodes for each channel that the platform uses.
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Example ADS1015 node:
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ads1015@49 {
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compatible = "ti,ads1015";
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reg = <0x49>;
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#address-cells = <1>;
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#size-cells = <0>;
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[ child node definitions... ]
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}
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2) channel nodes
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Required properties:
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- reg : the channel number
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Optional properties:
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- ti,gain : the programmable gain amplifier setting
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- ti,datarate : the converter data rate
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Example ADS1015 channel node:
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channel@4 {
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reg = <4>;
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ti,gain = <3>;
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ti,datarate = <5>;
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};
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