linux-kernel - Re: [PATCH v4 3/3] iio: imu: st_lsm6dsx: add i3c basic support for LSM6DSO and LSM6DSR

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Date:   Fri, 12 Jul 2019 18:14:29 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     linux-iio@...r.kernel.org, linux-i3c@...ts.infradead.org,
        linux-kernel@...r.kernel.org, lorenzo@...nel.org,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        bbrezillon@...nel.org, Joao.Pinto@...opsys.com
Subject: Re: [PATCH v4 3/3] iio: imu: st_lsm6dsx: add i3c basic support for
 LSM6DSO and LSM6DSR

On Fri, 12 Jul 2019 13:53:30 +0200
Vitor Soares <Vitor.Soares@...opsys.com> wrote:

> For today the st_lsm6dsx driver support LSM6DSO and LSM6DSR sensor only in
> spi and i2c mode.
> 
> The LSM6DSO and LSM6DSR are also i3c capable so lets give i3c support to
> them.
> 
> Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
> Acked-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
> Changes in v4:
>   Remove hw_id variable
> 
> Changes in v3:
>   Remove unnecessary st_lsm6dsx_i3c_data table used to hold device name
>   Use st_lsm6dsx_probe new form
> 
> Changes in v2:
>   Add support for LSM6DSR
>   Set pm_ops to st_lsm6dsx_pm_ops
> 
>  drivers/iio/imu/st_lsm6dsx/Kconfig          |  8 +++-
>  drivers/iio/imu/st_lsm6dsx/Makefile         |  1 +
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c | 58 +++++++++++++++++++++++++++++
>  3 files changed, 66 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/Kconfig b/drivers/iio/imu/st_lsm6dsx/Kconfig
> index 9e59297..6b5a73c 100644
> --- a/drivers/iio/imu/st_lsm6dsx/Kconfig
> +++ b/drivers/iio/imu/st_lsm6dsx/Kconfig
> @@ -1,11 +1,12 @@
>  
>  config IIO_ST_LSM6DSX
>  	tristate "ST_LSM6DSx driver for STM 6-axis IMU MEMS sensors"
> -	depends on (I2C || SPI)
> +	depends on (I2C || SPI || I3C)
>  	select IIO_BUFFER
>  	select IIO_KFIFO_BUF
>  	select IIO_ST_LSM6DSX_I2C if (I2C)
>  	select IIO_ST_LSM6DSX_SPI if (SPI_MASTER)
> +	select IIO_ST_LSM6DSX_I3C if (I3C)
>  	help
>  	  Say yes here to build support for STMicroelectronics LSM6DSx imu
>  	  sensor. Supported devices: lsm6ds3, lsm6ds3h, lsm6dsl, lsm6dsm,
> @@ -23,3 +24,8 @@ config IIO_ST_LSM6DSX_SPI
>  	tristate
>  	depends on IIO_ST_LSM6DSX
>  	select REGMAP_SPI
> +
> +config IIO_ST_LSM6DSX_I3C
> +	tristate
> +	depends on IIO_ST_LSM6DSX
> +	select REGMAP_I3C
> diff --git a/drivers/iio/imu/st_lsm6dsx/Makefile b/drivers/iio/imu/st_lsm6dsx/Makefile
> index e5f733c..c676965 100644
> --- a/drivers/iio/imu/st_lsm6dsx/Makefile
> +++ b/drivers/iio/imu/st_lsm6dsx/Makefile
> @@ -4,3 +4,4 @@ st_lsm6dsx-y := st_lsm6dsx_core.o st_lsm6dsx_buffer.o \
>  obj-$(CONFIG_IIO_ST_LSM6DSX) += st_lsm6dsx.o
>  obj-$(CONFIG_IIO_ST_LSM6DSX_I2C) += st_lsm6dsx_i2c.o
>  obj-$(CONFIG_IIO_ST_LSM6DSX_SPI) += st_lsm6dsx_spi.o
> +obj-$(CONFIG_IIO_ST_LSM6DSX_I3C) += st_lsm6dsx_i3c.o
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c
> new file mode 100644
> index 0000000..2e89524
> --- /dev/null
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
> + *
> + * Author: Vitor Soares <vitor.soares@...opsys.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i3c/device.h>
> +#include <linux/i3c/master.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +
> +#include "st_lsm6dsx.h"
> +
> +static const struct i3c_device_id st_lsm6dsx_i3c_ids[] = {
> +	I3C_DEVICE(0x0104, 0x006C, (void *)ST_LSM6DSO_ID),
> +	I3C_DEVICE(0x0104, 0x006B, (void *)ST_LSM6DSR_ID),

I think you need an uintptr_t cast here:

	I3C_DEVICE(0x0104, 0x006C, (void *)(uintptr_t)ST_LSM6DSO_ID),
	I3C_DEVICE(0x0104, 0x006B, (void *)(uintptr_t)ST_LSM6DSR_ID),

otherwise gcc might complain that the integer and pointer do not have
the same size (on 64-bit architectures).

> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(i3c, st_lsm6dsx_i3c_ids);
> +
> +static const struct regmap_config st_lsm6dsx_i3c_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};

This can be moved ...

> +
> +static int st_lsm6dsx_i3c_probe(struct i3c_device *i3cdev)
> +{

... here without the static and const qualifiers:

	struct regmap_config regmap_config = {
		.reg_bits = 8,
		.val_bits = 8,
	};

> +	const struct i3c_device_id *id = i3c_device_match_id(i3cdev,
> +							    st_lsm6dsx_i3c_ids);
> +	struct regmap *regmap;
> +
> +	regmap = devm_regmap_init_i3c(i3cdev, &st_lsm6dsx_i3c_regmap_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&i3cdev->dev, "Failed to register i3c regmap %d\n",
> +			(int)PTR_ERR(regmap));
> +		return PTR_ERR(regmap);
> +	}
> +
> +	return st_lsm6dsx_probe(&i3cdev->dev, 0, (int)id->data, regmap);

uintptr_t cast here.

> +}
> +
> +static struct i3c_driver st_lsm6dsx_driver = {
> +	.driver = {
> +		.name = "st_lsm6dsx_i3c",
> +		.pm = &st_lsm6dsx_pm_ops,
> +	},
> +	.probe = st_lsm6dsx_i3c_probe,
> +	.id_table = st_lsm6dsx_i3c_ids,
> +};
> +module_i3c_driver(st_lsm6dsx_driver);
> +
> +MODULE_AUTHOR("Vitor Soares <vitor.soares@...opsys.com>");
> +MODULE_DESCRIPTION("STMicroelectronics st_lsm6dsx i3c driver");
> +MODULE_LICENSE("GPL v2");