From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Serge Semin <fancer.lancer@gmail.com>,
Jarkko Nikula <jarkko.nikula@linux.intel.com>,
Wolfram Sang <wsa@the-dreams.de>,
Rob Herring <robh+dt@kernel.org>,
Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
<linux-mips@vger.kernel.org>,
linux-i2c <linux-i2c@vger.kernel.org>,
devicetree <devicetree@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 03/12] dt-bindings: i2c: Discard i2c-slave flag from the DW I2C example
Date: Wed, 27 May 2020 15:07:16 +0300 [thread overview]
Message-ID: <20200527120716.4dke6psqpw726wrd@mobilestation> (raw)
In-Reply-To: <CAHp75VdHC+fZNgc5oFbgYaNDebudDROcM_peRzOZpTVy55+tJg@mail.gmail.com>
On Wed, May 27, 2020 at 12:30:04PM +0300, Andy Shevchenko wrote:
> On Wed, May 27, 2020 at 1:00 AM Serge Semin
> <Sergey.Semin@baikalelectronics.ru> wrote:
> >
> > dtc currently doesn't support I2C_OWN_SLAVE_ADDRESS flag set in the
> > i2c "reg" property. If it is the compiler will print a warning:
>
> Shouldn't be dtc whatever tools fixed?
See the first patch in the series.
>
> > Warning (i2c_bus_reg): /example-2/i2c@1120000/eeprom@64: I2C bus unit address format error, expected "40000064"
> > Warning (i2c_bus_reg): /example-2/i2c@1120000/eeprom@64:reg: I2C address must be less than 10-bits, got "0x40000064"
> >
> > In order to silence dtc up let's discard the flag from the DW I2C DT
> > binding example for now. Just revert this commit when dtc is fixed.
>
> Doesn't sound like a good idea. If user happens in between of these
> ping-pong change, how they will know this subtle issue?
As I see it, there are three ways we can follow.
1) Apply the patch and revert when dtc is fixed.
2) Apply the patch, but add a comment above the property, that we need
to get the 0x40000064 address back when dtc is dixed.
3) Leave this ugly warning be until dtc is fixed.
In a comment to v2 Rob mentioned a solution like 1). Personally I am ok with
either, though I'd like to see a Rob's final comment about this.
-Sergey
>
> --
> With Best Regards,
> Andy Shevchenko
next prev parent reply other threads:[~2020-05-27 12:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 21:55 [PATCH v3 00/12] i2c: designeware: Add Baikal-T1 System I2C support Serge Semin
2020-05-26 21:55 ` [PATCH v3 01/12] scripts/dtc: check: Add 10bit/slave i2c reg flags support Serge Semin
2020-05-27 1:17 ` Rob Herring
2020-05-27 9:46 ` Serge Semin
2020-05-27 11:20 ` Serge Semin
2020-05-26 21:55 ` [PATCH v3 02/12] dt-bindings: i2c: Convert DW I2C binding to DT schema Serge Semin
2020-05-27 1:20 ` Rob Herring
2020-05-26 21:55 ` [PATCH v3 03/12] dt-bindings: i2c: Discard i2c-slave flag from the DW I2C example Serge Semin
2020-05-27 9:30 ` Andy Shevchenko
2020-05-27 12:07 ` Serge Semin [this message]
2020-05-27 13:32 ` Andy Shevchenko
2020-05-26 21:55 ` [PATCH v3 04/12] dt-bindings: i2c: dw: Add Baikal-T1 SoC I2C controller Serge Semin
2020-05-26 21:55 ` [PATCH v3 05/12] i2c: designware: Use `-y` to build multi-object modules Serge Semin
2020-05-26 21:55 ` [PATCH v3 06/12] i2c: designware: slave: Set DW I2C core module dependency Serge Semin
2020-05-26 21:55 ` [PATCH v3 07/12] i2c: designware: Add Baytrail sem config DW I2C platform dependency Serge Semin
2020-05-26 21:55 ` [PATCH v3 08/12] i2c: designware: Discard Cherry Trail model flag Serge Semin
2020-05-26 21:55 ` [PATCH v3 09/12] i2c: designware: Convert driver to using regmap API Serge Semin
2020-05-26 21:55 ` [PATCH v3 10/12] i2c: designware: Retrieve quirk flags as early as possible Serge Semin
2020-05-26 21:55 ` [PATCH v3 11/12] i2c: designware: Move reg-space remapping into a dedicated function Serge Semin
2020-05-27 9:26 ` Andy Shevchenko
2020-05-27 9:50 ` Serge Semin
2020-05-27 10:18 ` Andy Shevchenko
2020-05-26 21:55 ` [PATCH v3 12/12] i2c: designware: Add Baikal-T1 System I2C support Serge Semin
2020-05-27 13:30 ` [PATCH v3 00/12] i2c: designeware: " Andy Shevchenko
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