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

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Date:   Sun, 21 Jul 2019 11:09:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Ben Dooks <ben.dooks@...ethink.co.uk>
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

On Sun, Jul 21, 2019 at 5:45 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> 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:
> > > So, what shall we do?
> > >
> > > Drop the board-file support? Or, keep it
> > > in case somebody is still using their board-files
> > > in downstream?
>>
> > 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.
>
> 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...

Adding Ben Dooks to Cc.

I suspect this driver is completely obsolete and should be removed.

For some reason, it's not an SPI controller driver like all the other
files in that directory, but implements low-level access to the state
of a particular SPI device.

However, there should not really be a low-level driver for it that
just exports the pins to user space. It should either be a gpiolib
driver to let other drivers talk to the pins, or a high-level driver that
exposes the intended functionality (watchdog, regulator, ...)
to those respective subsystems.

       Arnd