Re: [PATCH v2 6/8] iio: adc: ad7192: add sequencer support

Jonathan Cameron
2022-03-19T16:04:16Z

On Fri, 18 Mar 2022 18:27:20 +0200
<alexandru.tachici@analog.com> wrote:

> From: Alexandru Tachici <alexandru.tachici@analog.com>
>
> Add sequencer support for AD7192.
>
> Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
> ---
> drivers/iio/adc/ad7192.c | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
> index adff6472e075..e59753c61274 100644
> --- a/drivers/iio/adc/ad7192.c
> +++ b/drivers/iio/adc/ad7192.c
> @@ -58,7 +58,8 @@
> /* Mode Register Bit Designations (AD7192_REG_MODE) */
> #define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */
> #define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */
> -#define AD7192_MODE_DAT_STA BIT(20) /* Status Register transmission */
> +#define AD7192_MODE_STA(x) (((x) & 0x1) << 20) /* Status Register transmission */
> +#define AD7192_MODE_STA_MASK BIT(20) /* Status Register transmission Mask */
> #define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */
> #define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */
> #define AD7192_MODE_ACX BIT(14) /* AC excitation enable(AD7195 only)*/
> @@ -288,12 +289,25 @@ static int ad7192_set_mode(struct ad_sigma_delta *sd,
> return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> }
>
> +static int ad7192_append_status(struct ad_sigma_delta *sd, bool append)
> +{
> + struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
> +
> + st->mode &= ~AD7192_MODE_STA_MASK;
> + st->mode |= AD7192_MODE_STA(append);
> +
Another case where I would prefer the state cache be updated after the write
succeeds unless there is some reason that doesn't make sense.

+ Swash patch 8 into this one so we don't leave a broken driver inbetween.

Thanks,

Jonathan

> + return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> +}
> +
> static const struct ad_sigma_delta_info ad7192_sigma_delta_info = {
> .set_channel = ad7192_set_channel,
> + .append_status = ad7192_append_status,
> .set_mode = ad7192_set_mode,
> .has_registers = true,
> .addr_shift = 3,
> .read_mask = BIT(6),
> + .status_ch_mask = GENMASK(3, 0),
> + .num_slots = 4,
> .irq_flags = IRQF_TRIGGER_FALLING,
> };
>