linux-kernel - Re: [PATCH v2 08/12] i2c: designware: Introduce platform drivers glue layer interface

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Date:   Thu, 21 May 2020 05:37:35 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        <linux-mips@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Hans de Goede <hdegoede@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v2 08/12] i2c: designware: Introduce platform drivers
 glue layer interface

On Wed, May 20, 2020 at 03:46:11PM +0300, Jarkko Nikula wrote:
> Hi
> 
> On 5/10/20 12:50 PM, Serge Semin wrote:
> > Seeing the DW I2C platform driver is getting overcomplicated with a lot of
> > vendor-specific configs let's introduce a glue-layer interface so new
> > platforms which equipped with Synopsys Designware APB I2C IP-core would
> > be able to handle their peculiarities in the dedicated objects.
> > 
> Comment to this patch and patches 9/12 and 12/12:
> 
> Currently i2c-designware-platdrv.c is about 500 lines of code so I don't
> think it's too overcomplicated. But I feel we have already too many Kconfig
> options and source modules for i2c-designware and obviously would like to
> push back a little from adding more.
> 
> I don't think i2c-designware-platdrv.c becomes yet too complicated if Baikal
> related code is added there, perhaps under #ifdef CONFIG_OF like MSCC Ocelot
> code is currently.

Well, it's up to you to decide, what solution is more suitable for you to
maintain. My idea of detaching the MSCC and Baikal-T1 code to the dedicated
source files was to eventually move the whole i2c-designware-* set of files
into a dedicated directory drivers/i2c/buses/dw as it's done for some others
Synopsys DesignWare controllers: drivers/pci/controller/dwc/, drivers/usb/dwc2,
drivers/usb/dwc3, drivers/net/ethernet/synopsys/ . If you think, that it's too
early for Dw I2C code to live in a dedicated directory, fine with me. I can
merge the MSCC and Baikal-T1 code back into the i2c-designware-platdrv.c .
So what's your final word in this matter?

-Sergey

> 
> -- 
> Jarkko