Linux-i3c Archive on lore.kernel.org
 help / color / Atom feed
From: Vitor Soares <Vitor.Soares@synopsys.com>
To: Boris Brezillon <boris.brezillon@collabora.com>,
	Vitor Soares <Vitor.Soares@synopsys.com>
Cc: "Joao.Pinto@synopsys.com" <Joao.Pinto@synopsys.com>,
	"rafael@kernel.org" <rafael@kernel.org>,
	"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"bbrezillon@kernel.org" <bbrezillon@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-i3c@lists.infradead.org" <linux-i3c@lists.infradead.org>,
	"lorenzo@kernel.org" <lorenzo@kernel.org>
Subject: RE: [PATCH v4 3/3] iio: imu: st_lsm6dsx: add i3c basic support for LSM6DSO and LSM6DSR
Date: Tue, 16 Jul 2019 13:22:25 +0000
Message-ID: <SN6PR12MB2655E375BBEC555BFFBA1B05AECE0@SN6PR12MB2655.namprd12.prod.outlook.com> (raw)
In-Reply-To: <20190712220320.50e7cfff@pc-381.home>

Hi Boris,

From: Boris Brezillon <boris.brezillon@collabora.com>
Date: Fri, Jul 12, 2019 at 21:03:20

> On Fri, 12 Jul 2019 18:40:14 +0000
> Vitor Soares <Vitor.Soares@synopsys.com> wrote:
> 
> > From: Boris Brezillon <boris.brezillon@collabora.com>
> > Date: Fri, Jul 12, 2019 at 17:43:23
> > 
> > > On Fri, 12 Jul 2019 16:28:02 +0000
> > > Vitor Soares <Vitor.Soares@synopsys.com> wrote:
> > >   
> > > > From: Boris Brezillon <boris.brezillon@collabora.com>
> > > > Date: Fri, Jul 12, 2019 at 17:14:29
> > > >   
> > > > > On Fri, 12 Jul 2019 13:53:30 +0200
> > > > > Vitor Soares <Vitor.Soares@synopsys.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@synopsys.com>
> > > > > > Acked-by: Lorenzo Bianconi <lorenzo@kernel.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@synopsys.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).    
> > > > 
> > > > I don't understand this part. Can you provide or point some background?  
> > > 
> > > If you don't do that you'll get the following warning:
> > > 
> > > 	warning: cast to 'void *' from smaller integer type 'int' [-Wint-to-void-pointer-cast]  
> > 
> > I don't get the warning during compilation. Is there any flag to enable 
> > or so?
> 
> Nope, nothing specific to enable, just enable this driver on an arm64
> config. Note that that gcc doesn't seem to complain about this
> int -> void * cast (there's probably some kind of auto-promotion to
> pointer size), but it does complains about the following void * -> int
> cast:
> 
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c: In function ‘st_lsm6dsx_i3c_probe’:
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c:43:43: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>    43 |  return st_lsm6dsx_probe(&i3cdev->dev, 0, (int)id->data, regmap);
>       |     

I fixed the warning by changing:

st_lsm6dsx_probe(&i3cdev->dev, 0, (int)id->data, regmap);

to

st_lsm6dsx_probe(&i3cdev->dev, 0, (int)(uintptr_t)id->data, regmap);

But I wonder if it isn't more save to change the following too:
	I3C_DEVICE(0x0104, 0x006C, (void *)(uintptr_t)ST_LSM6DSO_ID),
	I3C_DEVICE(0x0104, 0x006B, (void *)(uintptr_t)ST_LSM6DSR_ID),

What do you think?

Best regards,
Vitor Soares
_______________________________________________
linux-i3c mailing list
linux-i3c@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-i3c

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-12 11:53 [PATCH v4 0/3] Add ST lsm6dso i3c support Vitor Soares
2019-07-12 11:53 ` [PATCH v4 1/3] regmap: add i3c bus support Vitor Soares
2019-07-12 15:59   ` Boris Brezillon
2019-07-12 16:14     ` Vitor Soares
2019-07-12 11:53 ` [PATCH v4 2/3] i3c: move i3c_device_match_id to device.c and export it Vitor Soares
2019-07-12 16:03   ` Boris Brezillon
2019-07-12 16:21     ` Vitor Soares
2019-07-12 16:34       ` Boris Brezillon
2019-07-12 11:53 ` [PATCH v4 3/3] iio: imu: st_lsm6dsx: add i3c basic support for LSM6DSO and LSM6DSR Vitor Soares
2019-07-12 16:14   ` Boris Brezillon
2019-07-12 16:28     ` Vitor Soares
2019-07-12 16:43       ` Boris Brezillon
2019-07-12 18:40         ` Vitor Soares
2019-07-12 20:03           ` Boris Brezillon
2019-07-16 13:22             ` Vitor Soares [this message]
2019-07-16 13:40               ` Boris Brezillon
2019-07-12 15:58 ` [PATCH v4 0/3] Add ST lsm6dso i3c support Boris Brezillon

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=SN6PR12MB2655E375BBEC555BFFBA1B05AECE0@SN6PR12MB2655.namprd12.prod.outlook.com \
    --to=vitor.soares@synopsys.com \
    --cc=Joao.Pinto@synopsys.com \
    --cc=bbrezillon@kernel.org \
    --cc=boris.brezillon@collabora.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-i3c@lists.infradead.org \
    --cc=linux-iio@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lorenzo@kernel.org \
    --cc=rafael@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-i3c Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-i3c/0 linux-i3c/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-i3c linux-i3c/ https://lore.kernel.org/linux-i3c \
		linux-i3c@lists.infradead.org linux-i3c@archiver.kernel.org
	public-inbox-index linux-i3c


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-i3c


AGPL code for this site: git clone https://public-inbox.org/ public-inbox