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iio: adc: ad4080: enable address ascension for chip identification

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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: b66cddc8be ("iio: adc: ad4080: fix chip identification")
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
This commit is contained in:
Antoniu Miclaus 2026-09-22 14:09:58 +03:00 committed by Jonathan Cameron
parent 062c44e537
commit c051d08d98
1 changed files with 2 additions and 1 deletions
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3
drivers/iio/adc/ad4080.c
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@ -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;