linux-kernel - Re: [Question] orphan platform data header

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Date:   Sun, 21 Jul 2019 12:44:53 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Question] orphan platform data header

Hi Arnd,

On Sat, Jul 20, 2019 at 10:55 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Sat, Jul 20, 2019 at 5:26 AM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
> >
> > masahiro@...ver:~/ref/linux$ git grep netxbig_led_platform_data
> > drivers/leds/leds-netxbig.c:                          struct
> > netxbig_led_platform_data *pdata,
> > drivers/leds/leds-netxbig.c:                                 struct
> > netxbig_led_platform_data *pdata)
> > drivers/leds/leds-netxbig.c:                      struct
> > netxbig_led_platform_data *pdata)
> > drivers/leds/leds-netxbig.c:    struct netxbig_led_platform_data
> > *pdata = dev_get_platdata(&pdev->dev);
> > include/linux/platform_data/leds-kirkwood-netxbig.h:struct
> > netxbig_led_platform_data {
> >
> >
> >
> > So, what shall we do?
> >
> > Drop the board-file support? Or, keep it
> > in case somebody is still using their board-files
> > in downstream?
>
> Generally speaking, I'd remove the board file support in another
> case like this, but it's worth looking at when it was last used and by
> what.
>
> For this file, all boards got converted to DT, and the old setup
> code removed in commit ebc278f15759 ("ARM: mvebu: remove static
> LED setup for netxbig boards"), four years ago, so it's a fairly
> easy decision to make it DT only.


Thanks.

I see another case, which is difficult
to make a decision.

For example, drivers/spi/spi-tle62x0.c

This driver supports only board-file, but the board-file
is not found in upstream.

Unless I am terribly missing something,
there is no one who passes tle62x0_pdata
to this driver.

$ git grep tle62x0_pdata
drivers/spi/spi-tle62x0.c:      struct tle62x0_pdata *pdata;
include/linux/spi/tle62x0.h:struct tle62x0_pdata {

But, removing board-file support
makes this driver completely useless...


--
Best Regards
Masahiro Yamada