linux-kernel - Re: [PATCH 1/3] iio: dac: ad5686: add support for AD5338R

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Message-ID: <461dc314-87b9-fa40-e407-4bff9a95205b@metafoo.de>
Date:   Wed, 18 Mar 2020 18:30:29 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Michael Auchter <michael.auchter@...com>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc:     linux-pm@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] iio: dac: ad5686: add support for AD5338R

On 3/18/20 4:34 PM, Michael Auchter wrote:
> The AD5338R is a 10-bit DAC with 2 outputs and an internal 2.5V
> reference (enabled by default). The register configuration is nearly
> identical to the AD5696R DAC that's already supported by this driver,
> with the channel selection bits being the only thing different.
> 
> Signed-off-by: Michael Auchter <michael.auchter@...com>

Patch looks good, thanks. I just have one wish, which is to keep 
everything sorted by device ID. This will improve the longterm 
maintainability of the driver. AD5338R should be after AD5311R.

Also consider updating the Kconfig entry.

> ---
>   drivers/iio/dac/ad5686.c     | 13 +++++++++++++
>   drivers/iio/dac/ad5686.h     |  1 +
>   drivers/iio/dac/ad5696-i2c.c |  1 +
>   3 files changed, 15 insertions(+)
> 
> diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
> index e06b29c565b9..bbcac0e44837 100644
> --- a/drivers/iio/dac/ad5686.c
> +++ b/drivers/iio/dac/ad5686.c
> @@ -210,6 +210,12 @@ static struct iio_chan_spec name[] = {				\
>   		AD5868_CHANNEL(0, 0, bits, _shift),		\
>   }
>   
> +#define DECLARE_AD5338R_CHANNELS(name, bits, _shift)		\
> +static struct iio_chan_spec name[] = {				\
> +		AD5868_CHANNEL(0, 1, bits, _shift),		\
> +		AD5868_CHANNEL(1, 8, bits, _shift),		\
> +}
> +
>   #define DECLARE_AD5686_CHANNELS(name, bits, _shift)		\
>   static struct iio_chan_spec name[] = {				\
>   		AD5868_CHANNEL(0, 1, bits, _shift),		\
> @@ -262,6 +268,7 @@ DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
>   DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
>   DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
>   DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
> +DECLARE_AD5338R_CHANNELS(ad5338r_channels, 10, 6); >
>   static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
>   	[ID_AD5310R] = {
> @@ -413,6 +420,12 @@ static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
>   		.num_channels = 4,
>   		.regmap_type = AD5686_REGMAP,
>   	},
> +	[ID_AD5338R] = {
> +		.channels = ad5338r_channels,
> +		.int_vref_mv = 2500,
> +		.num_channels = 2,
> +		.regmap_type = AD5686_REGMAP,
> +	}, >   };
>   
>   int ad5686_probe(struct device *dev,
> diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h
> index 70a779939ddb..02eb196fcf0f 100644
> --- a/drivers/iio/dac/ad5686.h
> +++ b/drivers/iio/dac/ad5686.h
> @@ -77,6 +77,7 @@ enum ad5686_supported_device_ids {
>   	ID_AD5695R,
>   	ID_AD5696,
>   	ID_AD5696R,
> +	ID_AD5338R,
>   };
>   
>   enum ad5686_regmap_type {
> diff --git a/drivers/iio/dac/ad5696-i2c.c b/drivers/iio/dac/ad5696-i2c.c
> index ccf794caef43..f100a5fe4219 100644
> --- a/drivers/iio/dac/ad5696-i2c.c
> +++ b/drivers/iio/dac/ad5696-i2c.c
> @@ -83,6 +83,7 @@ static const struct i2c_device_id ad5686_i2c_id[] = {
>   	{"ad5695r", ID_AD5695R},
>   	{"ad5696", ID_AD5696},
>   	{"ad5696r", ID_AD5696R},
> +	{"ad5338r", ID_AD5338R},
>   	{}
>   };
>   MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
>