| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 387/599] staging:iio:adc:ad7280a: Fix handing of device address bit reversing. | Date | Tue, 5 Apr 2022 09:31:21 +0200 |
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From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[ Upstream commit f281e4ddbbc0b60f061bc18a2834e9363ba85f9f ]
The bit reversal was wrong for bits 1 and 3 of the 5 bits. Result is driver failure to probe if you have more than 2 daisy-chained devices. Discovered via QEMU based device emulation.
Fixes tag is for when this moved from a macro to a function, but it was broken before that.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Fixes: 065a7c0b1fec ("Staging: iio: adc: ad7280a.c: Fixed Macro argument reuse") Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com> Link: https://lore.kernel.org/r/20220206190328.333093-2-jic23@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/staging/iio/adc/ad7280a.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c index fef0055b8990..20183b2ea127 100644 --- a/drivers/staging/iio/adc/ad7280a.c +++ b/drivers/staging/iio/adc/ad7280a.c @@ -107,9 +107,9 @@ static unsigned int ad7280a_devaddr(unsigned int addr) { return ((addr & 0x1) << 4) | - ((addr & 0x2) << 3) | + ((addr & 0x2) << 2) | (addr & 0x4) | - ((addr & 0x8) >> 3) | + ((addr & 0x8) >> 2) | ((addr & 0x10) >> 4); } -- 2.34.1
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