linux-kernel - Re: [PATCH v3 3/3] iio: imu: st_lsm6dsx: add i3c basic support for LSM6DSO and LSM6DSR

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Date:   Wed, 10 Jul 2019 21:44:05 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     linux-iio@...r.kernel.org, linux-i3c@...ts.infradead.org,
        linux-kernel@...r.kernel.org, broonie@...nel.org,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        bbrezillon@...rnel.org, Joao.Pinto@...opsys.com
Subject: Re: [PATCH v3 3/3] iio: imu: st_lsm6dsx: add i3c basic support for
 LSM6DSO and LSM6DSR

> 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.

Hi Vitor,

just few comments inline.

Regards,
Lorenzo

> 
> Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
> Acked-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
> 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 | 61 +++++++++++++++++++++++++++++
>  3 files changed, 69 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c
> 

[...]

> 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..f683754
> --- /dev/null
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c
> @@ -0,0 +1,61 @@
> +// 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[];
> +

why do we need this? I guess you can just move st_lsm6dsx_i3c_ids definition here

> +static const struct regmap_config st_lsm6dsx_i3c_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +};
> +
> +static int st_lsm6dsx_i3c_probe(struct i3c_device *i3cdev)
> +{
> +	const struct i3c_device_id *id = i3c_device_match_id(i3cdev,
> +							    st_lsm6dsx_i3c_ids);

i3c_device_match_id can theoretically fail so is it better to check
return value here? (maybe I am too paranoid :))

> +	struct regmap *regmap;
> +	int hw_id = (int)id->data;

I guess we do not need this since we use it just in st_lsm6dsx_probe(),
we can just do:

return st_lsm6dsx_probe(&i3cdev->dev, 0, (int)id->data, 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, hw_id, regmap);
> +}
> +
> +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),
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(i3c, st_lsm6dsx_i3c_ids);
> +
> +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");
> -- 
> 2.7.4
> 

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