[PATCH v2 0/2] iio: dac: mcp47a1: add support for new device
From: Joshua Crofts
Date: Mon Jul 27 2026 - 14:31:59 EST
This patch series adds support for the MCP47A1 DAC.
The Microchip MCP47A1 is a volatile 6-bit Digital-to-Analog converter
which communicates via I2C. It is a low-power, low-cost DAC commonly
used in embedded systems.
Reasons for adding a new driver:
- Existing Microchip DACs use a more complicated set of commands
whereas the MCP47A1 communicates via SMBus using only one command.
- The closest Microchip DAC already in the tree - the MCP4725 - uses
an EEPROM while the MCP47A1 is volatile, meaning that altering
the driver of the former would worsen the code flow.
- The MCP47A1 maps cleanly to a standard regmap.
The driver was tested on a Raspberry Pi 4 using a breakout board with
the MCP47A1.
The datasheet can be viewed here:
https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/25154A.pdf
Signed-off-by: Joshua Crofts <joshua.crofts1@xxxxxxxxx>
---
Changes in v2:
- dt-bindings: add slave address enum to dt-binding
- dt-bindings: remove unnecessary example
- move driver from regmap to i2c_smbus_* functions to reduce overhead
- remove read test on probe as it's too unstable
- add 20us delay on startup
- style changes
- remove excess mailing list entry from MAINTAINERS
- Link to v1: https://lore.kernel.org/r/20260721-mcp47a1-add-support-v1-0-da045a2567e3@xxxxxxxxx
---
Joshua Crofts (2):
dt-bindings: iio: dac: add support for mcp47a1
iio: dac: mcp47a1: add support for new device
.../bindings/iio/dac/microchip,mcp47a1.yaml | 50 ++++++
MAINTAINERS | 6 +
drivers/iio/dac/Kconfig | 10 ++
drivers/iio/dac/Makefile | 1 +
drivers/iio/dac/mcp47a1.c | 169 +++++++++++++++++++++
5 files changed, 236 insertions(+)
---
base-commit: 0506462caaecb179708657142575823177c83783
change-id: 20260711-mcp47a1-add-support-3af1248f13a5
Best regards,
--
Kind regards,
Joshua Crofts