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From: Andrea Merello <andrea.merello@gmail.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Rob Herring <robh+dt@kernel.org>,
	Matt Ranostay <matt.ranostay@konsulko.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-iio <linux-iio@vger.kernel.org>,
	Andrea Merello <andrea.merello@iit.it>
Subject: Re: [PATCH 2/4] iio: imu: add Bosch Sensortec BNO055 core driver
Date: Mon, 19 Jul 2021 09:12:56 +0200	[thread overview]
Message-ID: <CAN8YU5M6S11Bbe3LW74RCD3zqL6xQ+ZF5JtzMKSMMn7pxLL27g@mail.gmail.com> (raw)
In-Reply-To: <YPF97IvnlUDtIHar@smile.fi.intel.com>

Just few inline comments; implicitly OK for others.

Il giorno ven 16 lug 2021 alle ore 14:39 Andy Shevchenko
<andy.shevchenko@gmail.com> ha scritto:
>
>
> > > Useless parentheses. If the LEN is a plain number, use decimal, if
> > > it's limited by register width, use the form of (BIT(x) - 1). In such
> > > a case it's easy to see how many bits are used for it.
> >
> > It's byte number, defined by how many 8-bits registers make up the
> > UID. I'll go for a decimal and I'll drop the parentheses.
>
> 15 seems the right one then?

Isn't it 16? From my understanding of the datasheet registers involved
are from 0x50 to 0x5F.

>
> > > > +       if (res && res != -ERESTARTSYS) {
> > >
> > > Shouldn't RESTARTSYS be handled on a regmap level?
> >
> > Can you please elaborate on this?
>
> I meant if you need to take care about this it seems to me that it has to be
> thought of on regmap level. I.o.w. what is the rationale behind this additional
> check?

The regmap_bus write() and read() implementations wait for an
interruptible completion, which is completed when a response from the
IMU is received. In practice by hitting Ctrl-C at the "right" moment I
got my kernel log polluted with dev_err() telling me the regmap
operation failed, but in this specific case there was nothing wrong:
it's just being aborted. Still, in all other error case I would like
to know. This is the rationale behind this check. The ERESTARTSYS
error have anyway to actually propagate in order to notify the caller
that the read/write just didn't complete.

If you mean move the check+dev_err() in bno055_sl.c regmap_bus read()
and write() ops, that is fine; my original point for putting it where
it is now, was because I was wondering whether this has to be common
to the (not yet here) I2C support code.

> ...
>
> > > Sounds like NIH hex2bin().
> >
> > Indeed.. I've failed to find out this helper. Looking at the code it
> > seems it wouldn't work as drop-in replacement here, because of spaces
> > in the HEX string. But I might just decide to format the HEX string
> > without spaces in order to being able to use hex2bin().
>
> I'm not even sure why it's in ASCII instead being directly binary file.

That was almost a coin-flip for me. Just, being a few bytes, I decided
to make them printable: If I load this driver for the 1st time, and
start poking around in it's sysfs, cat-ting random stuff to give a
look, I would just find a HEX line more friendly that a binary chunk
on my console.

.. But If you think it's better, I'll go for binary without any hesitation..

>
> > > IIO core should do this, besides the fact that it must use sysfs_emit().
> > > Ditto for the similar.
> >
> > Ok for sysfs_emit(), thanks. But what do you mean with "IIO core
> > should do this"? Can you please elaborate?
>
> I believe that IIO has a generic method to print tables via sysfs. AFAIR it is
> done via "_avail".

Ah, do you refer to the read_avail() operation in iio_info?
I'll try to go with it; I wasn't aware of that, thank you.

  reply	other threads:[~2021-07-19  7:13 UTC|newest]

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15 14:17 [PATCH 0/4] Add support for Bosch BNO055 IMU Andrea Merello
2021-07-15 14:17 ` [PATCH 1/4] iio: add modifiers for linear acceleration Andrea Merello
2021-07-17 14:32   ` Jonathan Cameron
2021-07-15 14:17 ` [PATCH 2/4] iio: imu: add Bosch Sensortec BNO055 core driver Andrea Merello
2021-07-15 16:49   ` Andy Shevchenko
2021-07-16  9:19     ` Andrea Merello
2021-07-16 12:39       ` Andy Shevchenko
2021-07-19  7:12         ` Andrea Merello [this message]
2021-07-19 10:33         ` Andrea Merello
2021-07-19  9:02     ` Andrea Merello
2021-07-19 11:48       ` Andy Shevchenko
2021-07-19 13:13         ` Andrea Merello
2021-07-16  7:24   ` Alexandru Ardelean
2021-07-16  9:49     ` Andrea Merello
2021-07-17 15:32   ` Jonathan Cameron
2021-07-19  8:30     ` Andrea Merello
2021-07-24 17:08       ` Jonathan Cameron
2021-07-26 14:36         ` Andrea Merello
2021-07-31 18:01           ` Jonathan Cameron
2021-08-04 10:06             ` Andrea Merello
2021-08-04 16:50               ` Jonathan Cameron
2021-08-04 19:27                 ` Andy Shevchenko
2021-07-15 14:17 ` [PATCH 3/4] dt-bindings: iio: imu: add bosch BNO055 serdev driver bindings Andrea Merello
2021-07-17 15:39   ` Jonathan Cameron
2021-07-19  8:44     ` Andrea Merello
2021-07-15 14:17 ` [PATCH 4/4] iio: imu: add BNO055 serdev driver Andrea Merello
2021-07-15 17:08   ` kernel test robot
2021-07-15 18:14   ` kernel test robot
2021-07-17 15:50   ` Jonathan Cameron
2021-07-19  8:49     ` Andrea Merello
2021-07-19 11:55       ` Andy Shevchenko
2021-07-19 12:59         ` Andrea Merello
2021-07-19 14:15           ` Andy Shevchenko
2021-07-19 15:07             ` Andrea Merello
2021-10-28 10:18 ` [v2 00/10] Add support for Bosch BNO055 IMU Andrea Merello
2021-10-28 10:18   ` [v2 01/10] utils_macro: introduce find_closest_unsorted() Andrea Merello
2021-10-28 10:25     ` Andy Shevchenko
2021-11-08 11:05       ` Andrea Merello
2021-10-28 10:18   ` [v2 02/10] iio: document linear acceleration modifiers Andrea Merello
2021-10-28 10:31     ` Andy Shevchenko
2021-11-09  7:48       ` Andrea Merello
2021-10-28 10:40     ` Jonathan Cameron
2021-11-09  8:00       ` Andrea Merello
2021-11-09 17:00         ` Jonathan Cameron
2021-10-28 10:18   ` [v2 03/10] iio: document euler angles modifiers Andrea Merello
2021-10-28 10:33     ` Andy Shevchenko
2021-10-28 10:41     ` Jonathan Cameron
2021-11-09  8:15       ` Andrea Merello
2021-11-09 17:03         ` Jonathan Cameron
2021-10-28 10:18   ` [v2 04/10] iio: add modifiers for linear acceleration Andrea Merello
2021-10-28 10:45     ` Jonathan Cameron
2021-11-09  9:58       ` Andrea Merello
2021-11-09 17:05         ` Jonathan Cameron
2021-10-28 10:18   ` [v2 05/10] iio: add modifers for pitch, yaw, roll Andrea Merello
2021-10-28 10:47     ` Jonathan Cameron
2021-10-28 10:18   ` [v2 06/10] iio: document bno055 private sysfs attributes Andrea Merello
2021-10-28 11:04     ` Jonathan Cameron
2021-11-09 10:22       ` Andrea Merello
2021-11-14 16:20         ` Jonathan Cameron
2022-01-04 11:42           ` Andrea Merello
2022-01-15 15:27             ` Jonathan Cameron
2022-01-17  9:37               ` Andrea Merello
2021-10-28 10:18   ` [v2 07/10] iio: imu: add Bosch Sensortec BNO055 core driver Andrea Merello
2021-10-28 13:31     ` Jonathan Cameron
2021-11-09 11:52       ` Andrea Merello
2021-11-14 16:33         ` Jonathan Cameron
2021-10-28 10:18   ` [v2 08/10] dt-bindings: iio: imu: add documentation for Bosch BNO055 bindings Andrea Merello
2021-10-28 12:25     ` Rob Herring
2021-10-28 10:18   ` [v2 09/10] iio: imu: add BNO055 serdev driver Andrea Merello
2021-10-28 12:31     ` Jonathan Cameron
2021-11-09 15:33       ` Andrea Merello
2021-11-14 16:37         ` Jonathan Cameron
2021-10-29  7:09     ` kernel test robot
2021-10-29 12:59     ` kernel test robot
2021-10-28 10:18   ` [v2 10/10] iio: imu: add BNO055 I2C driver Andrea Merello
2021-10-28 11:10     ` Jonathan Cameron
2021-11-11 10:12       ` Andrea Merello
2021-11-14 16:38         ` Jonathan Cameron
2021-10-28 22:04     ` Randy Dunlap
2021-11-09 11:56       ` Andrea Merello
2021-11-09 15:47         ` Randy Dunlap
2021-11-09 18:21           ` Joe Perches
2021-11-09 19:11             ` Randy Dunlap
2021-11-09 20:46               ` Joe Perches
2021-11-09 21:20                 ` Randy Dunlap
2021-10-29 13:30     ` kernel test robot
2021-10-28 10:35   ` [v2 00/10] Add support for Bosch BNO055 IMU Jonathan Cameron
2021-10-28 10:33     ` Andy Shevchenko

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