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Date:   Sun, 25 Nov 2018 09:56:38 +0000
From:   Jonathan Cameron <jic23@kernel.org>
To:     Matheus Tavares <matheus.bernardino@usp.br>
Cc:     Lars-Peter Clausen <lars@metafoo.de>,
        Michael Hennerich <Michael.Hennerich@analog.com>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>, linux-iio@vger.kernel.org,
        devel@driverdev.osuosl.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Alexandru Ardelean <alexandru.ardelean@analog.com>,
        kernel-usp@googlegroups.com, victorcolombo@gmail.com
Subject: Re: [PATCH v3 7/7] staging:iio:ad2s90: Move out of staging
Message-ID: <20181125095638.68e5205a@archlinux>
In-Reply-To: <20181124002312.6923-8-matheus.bernardino@usp.br>
References: <20181124002312.6923-1-matheus.bernardino@usp.br>
        <20181124002312.6923-8-matheus.bernardino@usp.br>
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On Fri, 23 Nov 2018 22:23:12 -0200
Matheus Tavares <matheus.bernardino@usp.br> wrote:

> Move ad2s90 resolver driver out of staging to the main tree.
> 
> Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
> Signed-off-by: Victor Colombo <victorcolombo@gmail.com>
Hi.

One totally trivial comment inline, but if you want to clean
that up, do it after we have moved this out of staging
(unless respinning for some other reason).

However, I would like to let this sit on the mailing list for
a little longer to let others comment and perhaps to pick up
a review of the DT binding doc (which looks fine to me, but
I am forever missing issues in those!)

Good work and I'll probably pick this up later in the week.

Thanks,

Jonathan
> ---
> Changes in v3:
>  - none
> 
> Changes in v2:
>  - Disabled git move detection, to see the whole code, as Jonathan
>  suggested
> 
>  drivers/iio/resolver/Kconfig          |  10 ++
>  drivers/iio/resolver/Makefile         |   1 +
>  drivers/iio/resolver/ad2s90.c         | 131 ++++++++++++++++++++++++++
>  drivers/staging/iio/resolver/Kconfig  |  10 --
>  drivers/staging/iio/resolver/Makefile |   1 -
>  drivers/staging/iio/resolver/ad2s90.c | 131 --------------------------
>  6 files changed, 142 insertions(+), 142 deletions(-)
>  create mode 100644 drivers/iio/resolver/ad2s90.c
>  delete mode 100644 drivers/staging/iio/resolver/ad2s90.c
> 
> diff --git a/drivers/iio/resolver/Kconfig b/drivers/iio/resolver/Kconfig
> index 2ced9f22aa70..786801be54f6 100644
> --- a/drivers/iio/resolver/Kconfig
> +++ b/drivers/iio/resolver/Kconfig
> @@ -3,6 +3,16 @@
>  #
>  menu "Resolver to digital converters"
>  
> +config AD2S90
> +	tristate "Analog Devices ad2s90 driver"
> +	depends on SPI
> +	help
> +	  Say yes here to build support for Analog Devices spi resolver
> +	  to digital converters, ad2s90, provides direct access via sysfs.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called ad2s90.
> +
>  config AD2S1200
>  	tristate "Analog Devices ad2s1200/ad2s1205 driver"
>  	depends on SPI
> diff --git a/drivers/iio/resolver/Makefile b/drivers/iio/resolver/Makefile
> index 4e1dccae07e7..398d82d50028 100644
> --- a/drivers/iio/resolver/Makefile
> +++ b/drivers/iio/resolver/Makefile
> @@ -2,4 +2,5 @@
>  # Makefile for Resolver/Synchro drivers
>  #
>  
> +obj-$(CONFIG_AD2S90) += ad2s90.o
>  obj-$(CONFIG_AD2S1200) += ad2s1200.o
> diff --git a/drivers/iio/resolver/ad2s90.c b/drivers/iio/resolver/ad2s90.c
> new file mode 100644
> index 000000000000..a41f5cb10da5
> --- /dev/null
> +++ b/drivers/iio/resolver/ad2s90.c
> @@ -0,0 +1,131 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ad2s90.c simple support for the ADI Resolver to Digital Converters: AD2S90
> + *
> + * Copyright (c) 2010-2010 Analog Devices Inc.
> + */
> +#include <linux/types.h>
> +#include <linux/mutex.h>
> +#include <linux/device.h>
> +#include <linux/spi/spi.h>
> +#include <linux/slab.h>
> +#include <linux/sysfs.h>
> +#include <linux/module.h>

We are into the truely trivial realms now - alphabetical order preferred
for includes.

> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +/*
> + * Although chip's max frequency is 2Mhz, it needs 600ns between CS and the
> + * first falling edge of SCLK, so frequency should be at most 1 / (2 * 6e-7)
> + */
> +#define AD2S90_MAX_SPI_FREQ_HZ  830000
> +
> +struct ad2s90_state {
> +	struct mutex lock; /* lock to protect rx buffer */
> +	struct spi_device *sdev;
> +	u8 rx[2] ____cacheline_aligned;
> +};
> +
> +static int ad2s90_read_raw(struct iio_dev *indio_dev,
> +			   struct iio_chan_spec const *chan,
> +			   int *val,
> +			   int *val2,
> +			   long m)
> +{
> +	int ret;
> +	struct ad2s90_state *st = iio_priv(indio_dev);
> +
> +	if (chan->type != IIO_ANGL)
> +		return -EINVAL;
> +
> +	switch (m) {
> +	case IIO_CHAN_INFO_SCALE:
> +		/* 2 * Pi / 2^12 */
> +		*val = 6283; /* mV */
> +		*val2 = 12;
> +		return IIO_VAL_FRACTIONAL_LOG2;
> +	case IIO_CHAN_INFO_RAW:
> +		mutex_lock(&st->lock);
> +		ret = spi_read(st->sdev, st->rx, 2);
> +		if (ret < 0) {
> +			mutex_unlock(&st->lock);
> +			return ret;
> +		}
> +		*val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
> +
> +		mutex_unlock(&st->lock);
> +
> +		return IIO_VAL_INT;
> +	default:
> +		break;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const struct iio_info ad2s90_info = {
> +	.read_raw = ad2s90_read_raw,
> +};
> +
> +static const struct iio_chan_spec ad2s90_chan = {
> +	.type = IIO_ANGL,
> +	.indexed = 1,
> +	.channel = 0,
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> +};
> +
> +static int ad2s90_probe(struct spi_device *spi)
> +{
> +	struct iio_dev *indio_dev;
> +	struct ad2s90_state *st;
> +
> +	if (spi->max_speed_hz > AD2S90_MAX_SPI_FREQ_HZ) {
> +		dev_err(&spi->dev, "SPI CLK, %d Hz exceeds %d Hz\n",
> +			spi->max_speed_hz, AD2S90_MAX_SPI_FREQ_HZ);
> +		return -EINVAL;
> +	}
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +	st = iio_priv(indio_dev);
> +	spi_set_drvdata(spi, indio_dev);
> +
> +	mutex_init(&st->lock);
> +	st->sdev = spi;
> +	indio_dev->dev.parent = &spi->dev;
> +	indio_dev->info = &ad2s90_info;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->channels = &ad2s90_chan;
> +	indio_dev->num_channels = 1;
> +	indio_dev->name = spi_get_device_id(spi)->name;
> +
> +	return devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> +}
> +
> +static const struct of_device_id ad2s90_of_match[] = {
> +	{ .compatible = "adi,ad2s90", },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, ad2s90_of_match);
> +
> +static const struct spi_device_id ad2s90_id[] = {
> +	{ "ad2s90" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(spi, ad2s90_id);
> +
> +static struct spi_driver ad2s90_driver = {
> +	.driver = {
> +		.name = "ad2s90",
> +		.of_match_table = ad2s90_of_match,
> +	},
> +	.probe = ad2s90_probe,
> +	.id_table = ad2s90_id,
> +};
> +module_spi_driver(ad2s90_driver);
> +
> +MODULE_AUTHOR("Graff Yang <graff.yang@gmail.com>");
> +MODULE_DESCRIPTION("Analog Devices AD2S90 Resolver to Digital SPI driver");
> +MODULE_LICENSE("GPL v2");
...