linux-kernel - Re: [PATCH] iio: adc: ad7124: fix mask used for setting AIN_BUFP & AIN

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Date:   Sat, 15 Jan 2022 20:54:06 +0200
From:   Cosmin Tanislav <demonsingur@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     cosmin.tanislav@...log.com, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: ad7124: fix mask used for setting AIN_BUFP &
 AIN_BUFM bits



On 1/15/22 20:56, Jonathan Cameron wrote:
> On Wed, 12 Jan 2022 22:00:36 +0200
> Cosmin Tanislav <demonsingur@...il.com> wrote:
> 
>> According to page 90 of the datasheet [1], AIN_BUFP is bit 6 and
>> AIN_BUFM is bit 5 of the CONFIG_0 -> CONFIG_7 registers.
>>
>> Fix the mask used for setting these bits.
>>
>> [1]: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7124-8.pdf
>>
>> Fixes: 0eaecea6e487 ("iio: adc: ad7124: Add buffered input support")
>> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
> Curious that didn't cause problems anyone noticed before. Ah well.
> 

I only noticed it because I'm writing a driver for a similar device,
it was not even reported by anyone.

> Applied to the fixes-togreg branch of iio.git and marked for stable.
> 
> Note that branch will probably be rebased after rc1 as I have some
> other things that need rc1 which will be in same pull request.
> 
> Jonathan
> 
>> ---
>>   drivers/iio/adc/ad7124.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
>> index e45c600fccc0..18c154afbd7a 100644
>> --- a/drivers/iio/adc/ad7124.c
>> +++ b/drivers/iio/adc/ad7124.c
>> @@ -76,7 +76,7 @@
>>   #define AD7124_CONFIG_REF_SEL(x)	FIELD_PREP(AD7124_CONFIG_REF_SEL_MSK, x)
>>   #define AD7124_CONFIG_PGA_MSK		GENMASK(2, 0)
>>   #define AD7124_CONFIG_PGA(x)		FIELD_PREP(AD7124_CONFIG_PGA_MSK, x)
>> -#define AD7124_CONFIG_IN_BUFF_MSK	GENMASK(7, 6)
>> +#define AD7124_CONFIG_IN_BUFF_MSK	GENMASK(6, 5)
>>   #define AD7124_CONFIG_IN_BUFF(x)	FIELD_PREP(AD7124_CONFIG_IN_BUFF_MSK, x)
>>   
>>   /* AD7124_FILTER_X */
>