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Date: Sun, 7 Apr 2019 11:54:15 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Beniamin Bia <beniamin.bia@...log.com>
Cc: <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
<knaack.h@....de>, <pmeerw@...erw.net>,
<gregkh@...uxfoundation.org>, <linux-iio@...r.kernel.org>,
<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
<mark.rutland@....com>, <robh+dt@...nel.org>,
<devicetree@...r.kernel.org>, <biabeniamin@...look.com>,
Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: Re: [PATCH 2/3] iio: adc: ad7616: Add support for AD7616 ADC
On Tue, 2 Apr 2019 16:18:40 +0300
Beniamin Bia <beniamin.bia@...log.com> wrote:
> The AD7616 is a 12-bit ADC with 16 channels.
>
> The AD7616 can be configured to work in hardware mode by controlling it via
> gpio pins and read data via spi. No support for software mode yet, but it
> is a work in progress.
>
> This device requires a reset in order to update oversampling, so chip info
> has got a new attribute to mark this.
>
> The current assumption that this driver makes for AD7616, is that it's
> working in Hardware Mode with Serial, Burst and Sequencer modes activated.
> To activate them, following pins must be pulled high:
> -SER/PAR
> -SEQEN
> And following must be pulled low:
> -WR/BURST
> -DB4/SEQEN
>
> Datasheets:
> Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7616.pdf
>
> Signed-off-by: Beniamin Bia <beniamin.bia@...log.com>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Looks good to me. One thing to look at in future is making it completely
clear what the various people in the signed-off-by list did. It may
be that you would ideally have a co-authored-by tag in here? The
usecases for that have only be clarified very recently so I won't
worry too much this time.
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/iio/adc/ad7606.c | 46 ++++++++++++++++++++++++++++++++++++
> drivers/iio/adc/ad7606.h | 9 ++++---
> drivers/iio/adc/ad7606_spi.c | 2 ++
> 3 files changed, 54 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
> index 6b87ed410c93..24c70c3cefb4 100644
> --- a/drivers/iio/adc/ad7606.c
> +++ b/drivers/iio/adc/ad7606.c
> @@ -39,6 +39,10 @@ static const unsigned int ad7606_oversampling_avail[7] = {
> 1, 2, 4, 8, 16, 32, 64,
> };
>
> +static const unsigned int ad7616_oversampling_avail[8] = {
> + 1, 2, 4, 8, 16, 32, 64, 128,
> +};
> +
> static int ad7606_reset(struct ad7606_state *st)
> {
> if (st->gpio_reset) {
> @@ -220,6 +224,11 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> mutex_lock(&st->lock);
> gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
> st->gpio_os->info, values);
> +
> + /* AD7616 requires a reset to update value */
> + if (st->chip_info->os_req_reset)
> + ad7606_reset(st);
> +
> st->oversampling = st->oversampling_avail[i];
> mutex_unlock(&st->lock);
>
> @@ -314,6 +323,36 @@ static const struct iio_chan_spec ad7606_channels[] = {
> AD7606_CHANNEL(7),
> };
>
> +/*
> + * The current assumption that this driver makes for AD7616, is that it's
> + * working in Hardware Mode with Serial, Burst and Sequencer modes activated.
> + * To activate them, following pins must be pulled high:
> + * -SER/PAR
> + * -SEQEN
> + * And following pins must be pulled low:
> + * -WR/BURST
> + * -DB4/SER1W
> + */
> +static const struct iio_chan_spec ad7616_channels[] = {
> + IIO_CHAN_SOFT_TIMESTAMP(16),
> + AD7606_CHANNEL(0),
> + AD7606_CHANNEL(1),
> + AD7606_CHANNEL(2),
> + AD7606_CHANNEL(3),
> + AD7606_CHANNEL(4),
> + AD7606_CHANNEL(5),
> + AD7606_CHANNEL(6),
> + AD7606_CHANNEL(7),
> + AD7606_CHANNEL(8),
> + AD7606_CHANNEL(9),
> + AD7606_CHANNEL(10),
> + AD7606_CHANNEL(11),
> + AD7606_CHANNEL(12),
> + AD7606_CHANNEL(13),
> + AD7606_CHANNEL(14),
> + AD7606_CHANNEL(15),
> +};
> +
> static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
> /* More devices added in future */
> [ID_AD7605_4] = {
> @@ -338,6 +377,13 @@ static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
> .oversampling_avail = ad7606_oversampling_avail,
> .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
> },
> + [ID_AD7616] = {
> + .channels = ad7616_channels,
> + .num_channels = 17,
> + .oversampling_avail = ad7616_oversampling_avail,
> + .oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
> + .os_req_reset = true,
> + },
> };
>
> static int ad7606_request_gpios(struct ad7606_state *st)
> diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
> index 8c91bd427c4e..f9ef52131e74 100644
> --- a/drivers/iio/adc/ad7606.h
> +++ b/drivers/iio/adc/ad7606.h
> @@ -15,12 +15,14 @@
> * @oversampling_avail pointer to the array which stores the available
> * oversampling ratios.
> * @oversampling_num number of elements stored in oversampling_avail array
> + * @os_req_reset some devices require a reset to update oversampling
> */
> struct ad7606_chip_info {
> const struct iio_chan_spec *channels;
> unsigned int num_channels;
> const unsigned int *oversampling_avail;
> unsigned int oversampling_num;
> + bool os_req_reset;
> };
>
> /**
> @@ -76,9 +78,9 @@ struct ad7606_state {
> /*
> * DMA (thus cache coherency maintenance) requires the
> * transfer buffers to live in their own cache lines.
> - * 8 * 16-bit samples + 64-bit timestamp
> + * 16 * 16-bit samples + 64-bit timestamp
> */
> - unsigned short data[12] ____cacheline_aligned;
> + unsigned short data[20] ____cacheline_aligned;
> };
>
> /**
> @@ -98,7 +100,8 @@ enum ad7606_supported_device_ids {
> ID_AD7605_4,
> ID_AD7606_8,
> ID_AD7606_6,
> - ID_AD7606_4
> + ID_AD7606_4,
> + ID_AD7616,
> };
>
> #ifdef CONFIG_PM_SLEEP
> diff --git a/drivers/iio/adc/ad7606_spi.c b/drivers/iio/adc/ad7606_spi.c
> index 4fd0ec36a086..b7faef69a58f 100644
> --- a/drivers/iio/adc/ad7606_spi.c
> +++ b/drivers/iio/adc/ad7606_spi.c
> @@ -53,6 +53,7 @@ static const struct spi_device_id ad7606_id_table[] = {
> { "ad7606-4", ID_AD7606_4 },
> { "ad7606-6", ID_AD7606_6 },
> { "ad7606-8", ID_AD7606_8 },
> + { "ad7616", ID_AD7616 },
> {}
> };
> MODULE_DEVICE_TABLE(spi, ad7606_id_table);
> @@ -62,6 +63,7 @@ static const struct of_device_id ad7606_of_match[] = {
> { .compatible = "adi,ad7606-4" },
> { .compatible = "adi,ad7606-6" },
> { .compatible = "adi,ad7606-8" },
> + { .compatible = "adi,ad7616" },
> { },
> };
> MODULE_DEVICE_TABLE(of, ad7606_of_match);
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