From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com>,
Wolfram Sang <wsa@the-dreams.de>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Serge Semin <fancer.lancer@gmail.com>,
Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org, linux-mips@vger.kernel.org,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 08/11] i2c: designware: Convert driver to using regmap API
Date: Wed, 27 May 2020 19:03:37 +0300 [thread overview]
Message-ID: <20200527160337.GL1634618@smile.fi.intel.com> (raw)
In-Reply-To: <20200527153046.6172-9-Sergey.Semin@baikalelectronics.ru>
On Wed, May 27, 2020 at 06:30:43PM +0300, Serge Semin wrote:
> Seeing the DW I2C driver is using flags-based accessors with two
> conditional clauses it would be better to replace them with the regmap
> API IO methods and to initialize the regmap object with read/write
> callbacks specific to the controller registers map implementation. This
> will be also handy for the drivers with non-standard registers mapping
> (like an embedded into the Baikal-T1 System Controller DW I2C block, which
> glue-driver is a part of this series).
>
> As before the driver tries to detect the mapping setup at probe stage and
> creates a regmap object accordingly, which will be used by the rest of the
> code to correctly access the controller registers. In two places it was
> appropriate to convert the hand-written read-modify-write and
> read-poll-loop design patterns to the corresponding regmap API
> ready-to-use methods.
>
> Note the regmap IO methods return value is checked only at the probe
> stage. The rest of the code won't do this because basically we have
> MMIO-based regmap so non of the read/write methods can fail (this also
> won't be needed for the Baikal-T1-specific I2C controller).
...
> + struct regmap_config map_cfg = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> + .disable_locking = true,
> + .reg_read = dw_reg_read,
> + .reg_write = dw_reg_write,
> + .max_register = DW_IC_COMP_TYPE
Perhaps leave comma here as well.
> + };
...
> + /*
> + * Note we'll check the return value of the regmap IO accessors only
> + * at the probe stage. The rest of the code won't do this because
> + * basically we have MMIO-based regmap so non of the read/write methods
> + * can fail.
> + */
> + dev->map = devm_regmap_init(dev->dev, NULL, dev, &map_cfg);
> + if (IS_ERR(dev->map)) {
> + dev_err(dev->dev, "Failed to init the registers map\n");
> + return PTR_ERR(dev->map);
> + }
> +
> return 0;
return PTR_ERR_OR_ZERO(dev->map);
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-05-27 16:03 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 15:30 [PATCH v5 00/11] i2c: designeware: Add Baikal-T1 System I2C support Serge Semin
2020-05-27 15:30 ` [PATCH v5 01/11] dt-bindings: i2c: Convert DW I2C binding to DT schema Serge Semin
2020-05-27 15:30 ` [PATCH v5 02/11] dt-bindings: i2c: Discard i2c-slave flag from the DW I2C example Serge Semin
2020-05-27 15:33 ` Serge Semin
2020-05-29 18:13 ` Rob Herring
2020-05-29 18:22 ` Serge Semin
2020-05-29 18:42 ` Andy Shevchenko
2020-05-29 18:45 ` Serge Semin
2020-05-29 18:58 ` Serge Semin
2020-06-08 23:46 ` Rob Herring
2020-05-27 15:30 ` [PATCH v5 03/11] dt-bindings: i2c: dw: Add Baikal-T1 SoC I2C controller Serge Semin
2020-05-27 15:35 ` Serge Semin
2020-05-27 15:30 ` [PATCH v5 04/11] i2c: designware: Use `-y` to build multi-object modules Serge Semin
2020-05-27 15:30 ` [PATCH v5 05/11] i2c: designware: slave: Set DW I2C core module dependency Serge Semin
2020-05-27 15:30 ` [PATCH v5 06/11] i2c: designware: Add Baytrail sem config DW I2C platform dependency Serge Semin
2020-05-27 15:55 ` Andy Shevchenko
2020-05-27 16:05 ` Serge Semin
2020-05-27 16:44 ` Andy Shevchenko
2020-05-27 15:30 ` [PATCH v5 07/11] i2c: designware: Discard Cherry Trail model flag Serge Semin
2020-05-27 15:57 ` Andy Shevchenko
2020-05-27 16:07 ` Serge Semin
2020-05-27 15:30 ` [PATCH v5 08/11] i2c: designware: Convert driver to using regmap API Serge Semin
2020-05-27 16:03 ` Andy Shevchenko [this message]
2020-05-27 16:09 ` Serge Semin
2020-05-27 15:30 ` [PATCH v5 09/11] i2c: designware: Retrieve quirk flags as early as possible Serge Semin
2020-05-27 15:30 ` [PATCH v5 10/11] i2c: designware: Move reg-space remapping into a dedicated function Serge Semin
2020-05-27 15:30 ` [PATCH v5 11/11] i2c: designware: Add Baikal-T1 System I2C support Serge Semin
2020-05-27 16:05 ` Andy Shevchenko
2020-05-27 16:10 ` Serge Semin
2020-05-27 16:08 ` [PATCH v5 00/11] i2c: designeware: " Andy Shevchenko
2020-05-27 16:15 ` Serge Semin
Reply instructions:
You may reply publicly 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=20200527160337.GL1634618@smile.fi.intel.com \
--to=andriy.shevchenko@linux.intel.com \
--cc=Alexey.Malahov@baikalelectronics.ru \
--cc=Sergey.Semin@baikalelectronics.ru \
--cc=devicetree@vger.kernel.org \
--cc=fancer.lancer@gmail.com \
--cc=jarkko.nikula@linux.intel.com \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=mika.westerberg@linux.intel.com \
--cc=robh+dt@kernel.org \
--cc=tsbogend@alpha.franken.de \
--cc=wsa@the-dreams.de \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).