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Groups > linux.kernel > #1593013
| From | Geert Uytterhoeven <geert@linux-m68k.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls |
| Date | 2017-03-06 10:20 +0100 |
| Message-ID | <thWYa-64J-29@gated-at.bofh.it> (permalink) |
| References | (4 earlier) <th1nc-5Qy-21@gated-at.bofh.it> <thjWO-2Ic-23@gated-at.bofh.it> <thmhX-4Cv-1@gated-at.bofh.it> <thWEO-5Iw-13@gated-at.bofh.it> <thWEP-5Iw-27@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi Uwe,
On Mon, Mar 6, 2017 at 9:58 AM, Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
> On Mon, Mar 06, 2017 at 09:49:39AM +0100, Geert Uytterhoeven wrote:
>> > Given that mctrl-gpio can be useful on legacy platforms, a device could
>> > silently run without cts-gpio even there.
>>
>> On platforms were CONFIG_GPIOLIB=n, this is not true, so the issue is moot.
>>
>> All serial drivers using (optional) mctrl-gpio have this in Kconfig:
>>
>> select SERIAL_MCTRL_GPIO if GPIOLIB
>>
>> So they will use mctrl-gpio when GPIOLIB is enabled.
>> If GPIOPLIB is disabled, no flow control GPIOs are expected, and the
>> driver should not break that case.
>
> So it all boils down to the question: Is GPIOLIB=n enough to assume no
> gpio is needed?
>
> I'd say it is not.
How does the platform register these GPIOs when GPIOPLIB is not enabled by
the platform, and gpiod_add_lookup_table() is thus not available?
Please show me an example.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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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[PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Richard Genoud <richard.genoud@gmail.com> - 2017-03-03 15:40 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-03 20:00 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2017-03-03 20:20 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-03 20:40 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2017-03-03 20:50 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-04 16:40 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2017-03-04 19:10 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-06 10:00 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2017-03-06 10:00 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-06 10:20 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2017-03-06 10:40 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2017-03-06 11:10 +0100
Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL calls Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-06 11:10 +0100
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