linux-kernel - Re: [PATCH v3 2/4] ACPI / scan: Create platform device for fwnodes with multiple i2c devices

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Date:   Tue, 07 Aug 2018 14:49:30 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        John Garry <john.garry@...wei.com>, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v3 2/4] ACPI / scan: Create platform device for fwnodes
 with multiple i2c devices

On Tue, 2018-08-07 at 13:29 +0200, Hans de Goede wrote:
> Hi,
> 
> On 07-08-18 13:19, Andy Shevchenko wrote:
> > On Tue, 2018-08-07 at 10:05 +0200, Hans de Goede wrote:

> > > +	/*
> > > +	 * These devices have multiple I2cSerialBus resources and an
> > > i2c-client
> > > +	 * must be instantiated for each, each with its own
> > > i2c_device_id.
> > > +	 * Normally we only instantiate an i2c-client for the first
> > > resource,
> > > +	 * using the ACPI HID as id. These special cases are handled by
> > > the
> > > +	 * drivers/platform/x86/i2c-multi-instantiate.c driver, which
> > > knows
> > > +	 * which i2c_device_id to use for each resource.
> > > +	 */
> > > +	static const struct acpi_device_id i2c_multi_instantiate_ids[] =
> > > {
> > > +		{"BSG1160", 0},
> > > +		{"", 0},
> > > +	};
> > 
> > Style nits:
> > - can we move it outside of function?
> 
> Sure, but there are 2 existing users of an array of acpi_device_id-s
> combined with an acpi_match_device_ids() call and both have the array
> inside the function, so for consistency it seems better to keep it
> where it is.

Hmm... OK.

> > - is this existing style in the file and / or files in this folder
> > for
> > IDs? (I mean unnecessary 0:s and empty string?
> 
> It seems that all variants one can come up with are already used
> inside
> this single file.

Ah, that's sad.

> I agree that less is more, so I will change this to:
> 
>          static const struct acpi_device_id
> i2c_multi_instantiate_ids[] = {

>                  {"BSG1160", },
>                  {}
>          };

In case if it mimics already existing style, looks quite good to me
(otherwise perhaps comma inside {} can also be removed).

> 
> For v4.

Does it make sense to test v3 on your opinion? Or better to wait for v4?

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy