linux-toradex.git/drivers/iio/dac, branch master

Merge 7.3-rc6 into char-misc-next

2026-10-05T07:34:50+00:00

This resolves a number of merge conflicts between the branches, and we
pick up the fixes in 7.3-rc6 that we need for testing.

Signed-off-by: Greg Kroah-Hartman

iio: dac: ad5758: Fix the offset calculation

2026-09-28T16:07:37+00:00

The offset is a count of DAC codes, so the microamp or microvolt units
of min and max cancel out and the final division by 1000 is wrong. For
the +-20 mA range the driver reports -32 instead of -32768. For the
+-5 V and +-10 V ranges min * (1 << 16) also overflows int, and the
reported offset is 0.

Drop the division and do the multiplication in 64 bits.

Fixes: 28d1a7ac2a0d ("iio: dac: Add AD5758 support")
Signed-off-by: Arka Mondal 
Reviewed-by: Nuno Sá 
Signed-off-by: Jonathan Cameron

iio: dac: ad5758: Reject out-of-range raw values

2026-09-28T16:07:37+00:00

ad5758_write_raw() passes the value from userspace straight to
ad5758_spi_reg_write(), which keeps only the low 16 bits. Writing -1
to the raw attribute gives full-scale output, and 65536 gives code 0.

Return -EINVAL for values outside 0 to U16_MAX, as ad5755 does.

Fixes: 28d1a7ac2a0d ("iio: dac: Add AD5758 support")
Signed-off-by: Arka Mondal 
Reviewed-by: Nuno Sá 
Signed-off-by: Jonathan Cameron

iio: dac: ad5758: Fix alignment for DMA safety

2026-09-28T16:07:37+00:00

ad5758_spi_reg_read() reads into st->d32[2] with spi_sync_transfer(),
but d32 is not marked __aligned(IIO_DMA_MINALIGN), so it can share a
cacheline with the fields before it. When DMA is not cache coherent,
the cache invalidation after the read can discard CPU writes to those
fields.

Mark d32 __aligned(IIO_DMA_MINALIGN). It is the last member of the
struct, so nothing comes after it.

Fixes: 28d1a7ac2a0d ("iio: dac: Add AD5758 support")
Signed-off-by: Arka Mondal 
Reviewed-by: Nuno Sá 
Signed-off-by: Jonathan Cameron

iio: dac: add support for Microchip MCP48FEB02

2026-09-28T16:07:36+00:00

This is the IIO driver for Microchip MCP48FxBy1/2/4/8 series of buffered
voltage output Digital-to-Analog Converters with nonvolatile or volatile
memory and an SPI Interface.

The families support up to 8 output channels.

The devices can be 8-bit, 10-bit and 12-bit.

Signed-off-by: Ariana Lazar 
Signed-off-by: Jonathan Cameron

iio: dac: mcp47feb02: refactor MCP47FEB02 I2C driver into two modules

2026-09-28T16:07:36+00:00

Prepare the driver for the bus-specific code by refactoring into separate
files. The renamed file will contain the common DAC functionality shared by
the MCP47FxBy1/2/4/8 I2C and MCP48FxBy1/2/4/8 SPI drivers. The MCP47FEB02
driver was refactored into two modules: mcp47feb02-core.c and
mcp47feb02-i2c.c in order to prepare the support for SPI MCP48FxBy1/2/4/8
DAC family on top of the current implementation.

Signed-off-by: Ariana Lazar 
Signed-off-by: Jonathan Cameron

iio: dac: mcp47feb02: protect EEPROM store sequence with mutex

2026-09-28T16:07:36+00:00

Move the mutex lock into store_eeprom_store() to prevent race conditions
when reading volatile registers and writing them to the EEPROM.

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Closes: https://lore.kernel.org/all/20260819125128.970911F000E9@smtp.kernel.org/
Reported-by: Sashiko 
Signed-off-by: Ariana Lazar 
Reviewed-by: Joshua Crofts 
Signed-off-by: Jonathan Cameron

iio: dac: mcp47feb02: Avoid unjustified probe error on missing label

2026-09-28T16:07:36+00:00

Fix unjustified probe error on missing optional 'label' property by
replacing dev_err_probe() with dev_warn_probe(). Correct %pfw usage by
passing the child fwnode handle directly in the error message. Besides the
probe warning a read error is returned at the attempt of reading a null
label.

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Reported-by: sashiko-bot@kernel.org
Closes: https://lore.kernel.org/all/20260804134616.1D8A21F00A3E@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Ariana Lazar 
Signed-off-by: Jonathan Cameron

iio: dac: mcp4821: reject devices without match data

2026-09-28T16:07:34+00:00

A device bound through driver_override need not match an entry in the
driver tables. In that case spi_get_device_match_data() returns NULL,
but mcp4821_probe() dereferences the result while configuring the IIO
device.

Reject devices without match data before using the chip information.

Fixes: cdf3ecb0d8d0 ("iio: dac: driver for MCP4821")
Signed-off-by: Jiale Yao 
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron

iio: dac: ad5755: validate SPI match data

2026-09-28T16:07:34+00:00

A device bound through driver_override need not match an entry in the
driver tables. In that case spi_get_device_match_data() returns NULL,
but ad5755_probe() stores and later dereferences the result.

Validate the match data before it is used.

Fixes: 62d3fb9dcc09 ("iio: dac: ad5755: make use of of_device_id table")
Signed-off-by: Jiale Yao 
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron