diff options
| author | Anshul Dalal <anshulusr@gmail.com> | 2023-12-20 20:49:53 +0530 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2023-12-21 17:04:42 +0000 |
| commit | cdf3ecb0d8d0a83c940a8892b3e8aeaf35dc4353 (patch) | |
| tree | b0c4b0389777ab1fd8682e94c2b5a9e72a879901 /drivers/iio/dac/Makefile | |
| parent | 6b626eee66a88b671585c1804667a4fb10a434ef (diff) | |
| download | linux-stable-cdf3ecb0d8d0a83c940a8892b3e8aeaf35dc4353.tar.gz linux-stable-cdf3ecb0d8d0a83c940a8892b3e8aeaf35dc4353.tar.bz2 linux-stable-cdf3ecb0d8d0a83c940a8892b3e8aeaf35dc4353.zip | |
iio: dac: driver for MCP4821
Adds driver for the MCP48xx series of DACs.
Device uses a simplex SPI channel. To set the value of an output channel,
a 16-bit data of following format must be written:
Bit field | Description
15 [MSB] | Channel selection bit
0 -> Channel A
1 -> Channel B
13 | Output Gain Selection bit
0 -> 2x Gain (Vref = 4.096V)
1 -> 1x Gain (Vref = 2.048V)
12 | Output Shutdown Control bit
0 -> Shutdown the selected channel
1 -> Active mode operation
11-0 [LSB]| DAC Input Data bits
Value's big endian representation is taken as input for the
selected DAC channel. For devices with a resolution of less
than 12-bits, only the x most significant bits are considered
where x is the resolution of the device.
Reference: Page#22 [MCP48x2 Datasheet]
Supported devices:
+---------+--------------+-------------+
| Device | Resolution | Channels |
|---------|--------------|-------------|
| MCP4801 | 8-bit | 1 |
| MCP4802 | 8-bit | 2 |
| MCP4811 | 10-bit | 1 |
| MCP4812 | 10-bit | 2 |
| MCP4821 | 12-bit | 1 |
| MCP4822 | 12-bit | 2 |
+---------+--------------+-------------+
Devices tested:
MCP4821 [12-bit single channel]
MCP4802 [8-bit dual channel]
Tested on Raspberry Pi Zero 2W
Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/22244B.pdf #MCP48x1
Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/20002249B.pdf #MCP48x2
Signed-off-by: Anshul Dalal <anshulusr@gmail.com>
Link: https://lore.kernel.org/r/20231220151954.154595-2-anshulusr@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/dac/Makefile')
| -rw-r--r-- | drivers/iio/dac/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 5b2bac900d5a..55bf89739d14 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -42,6 +42,7 @@ obj-$(CONFIG_MAX5522) += max5522.o obj-$(CONFIG_MAX5821) += max5821.o obj-$(CONFIG_MCP4725) += mcp4725.o obj-$(CONFIG_MCP4728) += mcp4728.o +obj-$(CONFIG_MCP4821) += mcp4821.o obj-$(CONFIG_MCP4922) += mcp4922.o obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o obj-$(CONFIG_STM32_DAC) += stm32-dac.o |