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definitions=main-2609220207 On Tue, Sep 22, 2026 at 02:09:58PM +0300, Antoniu Miclaus wrote: > The two byte bulk read at AD4080_REG_PRODUCT_ID_L expects PRODUCT_ID_L > followed by PRODUCT_ID_H. After a software reset the AD408x defaults to > descending address mode, so the second byte comes from CHIP_TYPE (0x03) > instead. CHIP_TYPE reads 0x07 on all AD408x parts, so an AD4080 reports > 0x0750 rather than 0x0050 and every part logs "Unrecognized CHIP_ID". > > Set ADDR_ASC along with SDO_ENABLE before the read. This is the only > multi byte transfer in the driver, so no other access is affected. > > Fixes: b66cddc8be72 ("iio: adc: ad4080: fix chip identification") > Signed-off-by: Antoniu Miclaus > --- You could also just use change AD4080_REG_PRODUCT_ID_L to AD4080_REG_PRODUCT_ID_H (maybe a slight smaller diff). Nut no strong feelings: Reviewed-by: Nuno Sá > drivers/iio/adc/ad4080.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/iio/adc/ad4080.c b/drivers/iio/adc/ad4080.c > index 4843ecdd91a8..4ed82aa42400 100644 > --- a/drivers/iio/adc/ad4080.c > +++ b/drivers/iio/adc/ad4080.c > @@ -710,7 +710,8 @@ static int ad4080_setup_channel(struct ad4080_state *st, unsigned int ch) > return ret; > > ret = regmap_write(st->regmap[ch], AD4080_REG_INTERFACE_CONFIG_A, > - AD4080_INTERFACE_CONFIG_A_SDO_ENABLE); > + AD4080_INTERFACE_CONFIG_A_SDO_ENABLE | > + AD4080_INTERFACE_CONFIG_A_ADDR_ASC); > if (ret) > return ret; > > > base-commit: dceba8e581e3e8f475da0efbd7a73f3d9524ddd2 > -- > 2.43.0 >