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Message-ID: <CAMuHMdU6LhvnZ5FE_3BxyH7reVi69Rjcircquk=jYZ6-j3cqug@mail.gmail.com>
Date: Mon, 14 Aug 2023 15:12:24 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Jonathan Cameron <jic23@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Peter Rosin <peda@...ntia.se>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Daniel Scally <djrscally@...il.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
Andi Shyti <andi.shyti@...nel.org>,
Wolfram Sang <wsa@...nel.org>,
Geert Uytterhoeven <geert+renesas@...der.be>,
"linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org"
<linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v7 0/4] Extend device_get_match_data() to struct bus_type
Hi Biju,
On Fri, Aug 11, 2023 at 4:46 PM Biju Das <biju.das.jz@...renesas.com> wrote:
> > Subject: Re: [PATCH v7 0/4] Extend device_get_match_data() to struct
> > bus_type
> >
> > On Fri, Aug 11, 2023 at 01:27:36PM +0000, Biju Das wrote:
> > > > On Thu, Aug 10, 2023 at 09:05:10AM +0000, Biju Das wrote:
> >
> > ...
> >
> > > > I'm good with this approach, but make sure you checked the whole
> > > > kernel source tree for a such.
> > >
> > > Checking against 16 is too short I guess??
> > >
> > > drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h has 18 enums.
> >
> > So, what does prevent us from moving that tables to use pointers?
>
> I think that will lead to ABI breakage(client->name vs id->name)
>
> match = device_get_match_data(&client->dev);
> if (match) {
> chip_type = (uintptr_t)match;
> name = client->name;
> } else if (id) {
> chip_type = (enum inv_devices)
> id->driver_data;
> name = id->name;
> } else {
> return -ENOSYS;
> }
I don't consider that part of the ABI, as e.g. converting from board files
to DT would change the name.
In addition, using id->name breaks multiple instances of the same device.
I applaud more unification ;-)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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