Re: [PATCH] iio: dac: ad5686: Add support for AD5674R/AD5679R

From: Jonathan Cameron
Date: Sat Jan 12 2019 - 13:57:57 EST

On Wed, 9 Jan 2019 11:14:16 +0200
Mircea Caprioru <mircea.caprioru@xxxxxxxxxx> wrote:

> The AD5674R/AD5679R are low power, 16-channel, 12-/16-bit buffered voltage
> output digital-to-analog converters (DACs). They include a 2.5 V internal
> reference (enabled by default).
>
> These devices are very similar to AD5684R/AD5686R, except that they have 16
> channels.
>
> Signed-off-by: Mircea Caprioru <mircea.caprioru@xxxxxxxxxx>
Looks good to me.

One comment inline, but just ignore it ;)

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
> drivers/iio/dac/Kconfig | 6 +++---
> drivers/iio/dac/ad5686-spi.c | 7 ++++--
> drivers/iio/dac/ad5686.c | 42 ++++++++++++++++++++++++++++++++++--
> drivers/iio/dac/ad5686.h | 2 ++
> 4 files changed, 50 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
> index 851b61eaf3da..f28daf67db6a 100644
> --- a/drivers/iio/dac/Kconfig
> +++ b/drivers/iio/dac/Kconfig
> @@ -148,9 +148,9 @@ config AD5686_SPI
> depends on SPI
> select AD5686
> help
> - Say yes here to build support for Analog Devices AD5672R, AD5676,
> - AD5676R, AD5684, AD5684R, AD5684R, AD5685R, AD5686, AD5686R.
> - Voltage Output Digital to Analog Converter.
> + Say yes here to build support for Analog Devices AD5672R, AD5674R,
> + AD5676, AD5676R, AD5679R, AD5684, AD5684R, AD5684R, AD5685R, AD5686,
> + AD5686R Voltage Output Digital to Analog Converter.
>
> To compile this driver as a module, choose M here: the
> module will be called ad5686.
> diff --git a/drivers/iio/dac/ad5686-spi.c b/drivers/iio/dac/ad5686-spi.c
> index 665fa6bd9ced..4d857c8da2d2 100644
> --- a/drivers/iio/dac/ad5686-spi.c
> +++ b/drivers/iio/dac/ad5686-spi.c
> @@ -1,7 +1,8 @@
> // SPDX-License-Identifier: GPL-2.0+
> /*
> - * AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R,
> - * AD5684, AD5684R, AD5685R, AD5686, AD5686R
> + * AD5672R, AD5674R, AD5676, AD5676R, AD5679R,
> + * AD5681R, AD5682R, AD5683, AD5683R, AD5684,
> + * AD5684R, AD5685R, AD5686, AD5686R
This goes to show that listing the parts supported by the driver at the top
is more trouble than it's worth. The nice id tables tell us the same
thing and have much less churn ;)

oh well. I don't really care obviously.

> * Digital to analog converters driver
> *
> * Copyright 2018 Analog Devices Inc.
> @@ -102,8 +103,10 @@ static int ad5686_spi_remove(struct spi_device *spi)
> static const struct spi_device_id ad5686_spi_id[] = {
> {"ad5310r", ID_AD5310R},
> {"ad5672r", ID_AD5672R},
> + {"ad5674r", ID_AD5674R},
> {"ad5676", ID_AD5676},
> {"ad5676r", ID_AD5676R},
> + {"ad5679r", ID_AD5679R},
> {"ad5681r", ID_AD5681R},
> {"ad5682r", ID_AD5682R},
> {"ad5683", ID_AD5683},
> diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
> index a332b93ca2c4..6dd2759b9092 100644
> --- a/drivers/iio/dac/ad5686.c
> +++ b/drivers/iio/dac/ad5686.c
> @@ -71,7 +71,7 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
> int ret;
> struct ad5686_state *st = iio_priv(indio_dev);
> unsigned int val, ref_bit_msk;
> - u8 shift;
> + u8 shift, address = 0;
>
> ret = strtobool(buf, &readin);
> if (ret)
> @@ -94,6 +94,9 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
> case AD5686_REGMAP:
> shift = 0;
> ref_bit_msk = 0;
> + /* AD5674R/AD5679R have 16 channels and 2 powerdown registers */
> + if (chan->channel > 0x7)
> + address = 0x8;
> break;
> case AD5693_REGMAP:
> shift = 13;
> @@ -107,7 +110,8 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
> if (!st->use_internal_vref)
> val |= ref_bit_msk;
>
> - ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0, val);
> + ret = st->write(st, AD5686_CMD_POWERDOWN_DAC,
> + address, val >> (address * 2));
>
> return ret ? ret : len;
> }
> @@ -226,10 +230,32 @@ static struct iio_chan_spec name[] = { \
> AD5868_CHANNEL(7, 7, bits, _shift), \
> }
>
> +#define DECLARE_AD5679_CHANNELS(name, bits, _shift) \
> +static struct iio_chan_spec name[] = { \
> + AD5868_CHANNEL(0, 0, bits, _shift), \
> + AD5868_CHANNEL(1, 1, bits, _shift), \
> + AD5868_CHANNEL(2, 2, bits, _shift), \
> + AD5868_CHANNEL(3, 3, bits, _shift), \
> + AD5868_CHANNEL(4, 4, bits, _shift), \
> + AD5868_CHANNEL(5, 5, bits, _shift), \
> + AD5868_CHANNEL(6, 6, bits, _shift), \
> + AD5868_CHANNEL(7, 7, bits, _shift), \
> + AD5868_CHANNEL(8, 8, bits, _shift), \
> + AD5868_CHANNEL(9, 9, bits, _shift), \
> + AD5868_CHANNEL(10, 10, bits, _shift), \
> + AD5868_CHANNEL(11, 11, bits, _shift), \
> + AD5868_CHANNEL(12, 12, bits, _shift), \
> + AD5868_CHANNEL(13, 13, bits, _shift), \
> + AD5868_CHANNEL(14, 14, bits, _shift), \
> + AD5868_CHANNEL(15, 15, bits, _shift), \
> +}
> +
> DECLARE_AD5693_CHANNELS(ad5310r_channels, 10, 2);
> DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
> DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
> +DECLARE_AD5679_CHANNELS(ad5674r_channels, 12, 4);
> DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
> +DECLARE_AD5679_CHANNELS(ad5679r_channels, 16, 0);
> DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
> DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
> DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
> @@ -262,6 +288,12 @@ static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
> .num_channels = 8,
> .regmap_type = AD5686_REGMAP,
> },
> + [ID_AD5674R] = {
> + .channels = ad5674r_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 16,
> + .regmap_type = AD5686_REGMAP,
> + },
> [ID_AD5675R] = {
> .channels = ad5676_channels,
> .int_vref_mv = 2500,
> @@ -279,6 +311,12 @@ static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
> .num_channels = 8,
> .regmap_type = AD5686_REGMAP,
> },
> + [ID_AD5679R] = {
> + .channels = ad5679r_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 16,
> + .regmap_type = AD5686_REGMAP,
> + },
> [ID_AD5681R] = {
> .channels = ad5691r_channels,
> .int_vref_mv = 2500,
> diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h
> index 19f6917d4738..4c3e171ce0cc 100644
> --- a/drivers/iio/dac/ad5686.h
> +++ b/drivers/iio/dac/ad5686.h
> @@ -54,9 +54,11 @@ enum ad5686_supported_device_ids {
> ID_AD5311R,
> ID_AD5671R,
> ID_AD5672R,
> + ID_AD5674R,
> ID_AD5675R,
> ID_AD5676,
> ID_AD5676R,
> + ID_AD5679R,
> ID_AD5681R,
> ID_AD5682R,
> ID_AD5683,