linux-kernel - Re: [PATCH] iio: adc: ad7124: Enable internal reference

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Date:   Sat, 16 Nov 2019 16:26:41 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mircea Caprioru <mircea.caprioru@...log.com>
Cc:     <Michael.Hennerich@...log.com>, <stefan.popa@...log.com>,
        <lars@...afoo.de>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
Subject: Re: [PATCH] iio: adc: ad7124: Enable internal reference

On Thu, 14 Nov 2019 11:24:26 +0200
Mircea Caprioru <mircea.caprioru@...log.com> wrote:

> When the internal reference was selected by a channel it was not enabled.
> This patch fixes that and enables it.
> 
> Signed-off-by: Mircea Caprioru <mircea.caprioru@...log.com>

Probably want to clearly mark this as a fix in the patch title and
give a fixes tag here.

Seems like it would be awfully broken without this!

Jonathan

> ---
>  drivers/iio/adc/ad7124.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
> index edc6f1cc90b2..3f03abf100b5 100644
> --- a/drivers/iio/adc/ad7124.c
> +++ b/drivers/iio/adc/ad7124.c
> @@ -39,6 +39,8 @@
>  #define AD7124_STATUS_POR_FLAG_MSK	BIT(4)
>  
>  /* AD7124_ADC_CONTROL */
> +#define AD7124_ADC_CTRL_REF_EN_MSK	BIT(8)
> +#define AD7124_ADC_CTRL_REF_EN(x)	FIELD_PREP(AD7124_ADC_CTRL_REF_EN_MSK, x)
>  #define AD7124_ADC_CTRL_PWR_MSK	GENMASK(7, 6)
>  #define AD7124_ADC_CTRL_PWR(x)		FIELD_PREP(AD7124_ADC_CTRL_PWR_MSK, x)
>  #define AD7124_ADC_CTRL_MODE_MSK	GENMASK(5, 2)
> @@ -424,7 +426,10 @@ static int ad7124_init_channel_vref(struct ad7124_state *st,
>  		break;
>  	case AD7124_INT_REF:
>  		st->channel_config[channel_number].vref_mv = 2500;
> -		break;
> +		st->adc_control &= ~AD7124_ADC_CTRL_REF_EN_MSK;
> +		st->adc_control |= AD7124_ADC_CTRL_REF_EN(1);
> +		return ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL,
> +				      2, st->adc_control);
>  	default:
>  		dev_err(&st->sd.spi->dev, "Invalid reference %d\n", refsel);
>  		return -EINVAL;