linux-kernel - Re: [PATCH v2 07/12] i2c: designware: Move Baytrail sem config to the platform if-clause

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Date:   Thu, 21 May 2020 05:22:15 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        <linux-mips@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Max Staudt <max@...as.org>, Stefan Roese <sr@...x.de>,
        <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/12] i2c: designware: Move Baytrail sem config to
 the platform if-clause

On Wed, May 20, 2020 at 03:16:14PM +0300, Jarkko Nikula wrote:
> On 5/10/20 12:50 PM, Serge Semin wrote:
> > Currently Intel Baytrail I2C semaphore is a feature of the DW APB I2C
> > platform driver. It's a bit confusing to see it's config in the menu at
> > some separated place with no reference to the platform code. Lets move the
> > config definition under the if-I2C_DESIGNWARE_PLATFORM clause. By doing so
> > the config menu will display the feature right below the DW I2C platform
> > driver item and will indent it to the right so signifying its belonging.
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Paul Burton <paulburton@...nel.org>
> > Cc: Ralf Baechle <ralf@...ux-mips.org>
> > Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > Cc: Wolfram Sang <wsa@...-dreams.de>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Frank Rowand <frowand.list@...il.com>
> > Cc: linux-mips@...r.kernel.org
> > Cc: devicetree@...r.kernel.org
> > ---
> >   drivers/i2c/busses/Kconfig | 30 +++++++++++++++++-------------
> >   1 file changed, 17 insertions(+), 13 deletions(-)
> > 
> > diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> > index 368aa64e9266..ed6927c4c540 100644
> > --- a/drivers/i2c/busses/Kconfig
> > +++ b/drivers/i2c/busses/Kconfig
> > @@ -530,8 +530,8 @@ config I2C_DESIGNWARE_CORE
> >   config I2C_DESIGNWARE_PLATFORM
> >   	tristate "Synopsys DesignWare Platform"
> > -	select I2C_DESIGNWARE_CORE
> >   	depends on (ACPI && COMMON_CLK) || !ACPI
> > +	select I2C_DESIGNWARE_CORE
> >   	help
> >   	  If you say yes to this option, support will be included for the
> >   	  Synopsys DesignWare I2C adapter.
> > @@ -539,6 +539,22 @@ config I2C_DESIGNWARE_PLATFORM
> >   	  This driver can also be built as a module.  If so, the module
> >   	  will be called i2c-designware-platform.
> > +if I2C_DESIGNWARE_PLATFORM
> > +
> > +config I2C_DESIGNWARE_BAYTRAIL
> > +	bool "Intel Baytrail I2C semaphore support"
> > +	depends on ACPI
> > +	depends on (I2C_DESIGNWARE_PLATFORM=m && IOSF_MBI) || \
> > +		   (I2C_DESIGNWARE_PLATFORM=y && IOSF_MBI=y)
> > +	help
> > +	  This driver enables managed host access to the PMIC I2C bus on select
> > +	  Intel BayTrail platforms using the X-Powers AXP288 PMIC. It allows
> > +	  the host to request uninterrupted access to the PMIC's I2C bus from
> > +	  the platform firmware controlling it. You should say Y if running on
> > +	  a BayTrail system using the AXP288.
> > +
> > +endif # I2C_DESIGNWARE_PLATFORM
> > +
> 
> Is the added "if I2C_DESIGNWARE_PLATFORM" needed here? Should the "depends
> on" be enough?

The idea was to add if-endif clause here for features possibly added sometime
in future. But using normal "depends on I2C_DESIGNWARE_PLATFORM" shall make
the config depicted as an indented sub-config as well. Would you like me to
remove the if-clause and use the depends on operator instead?

-Sergey

> 
> Jarkko