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From: Shawn Guo <shawn.guo@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jeffrey Hugo <jhugo@codeaurora.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH] gpiolib: acpi: support override broken GPIO number in ACPI table
Date: Wed, 3 Mar 2021 16:45:09 +0800	[thread overview]
Message-ID: <20210303084508.GA17424@dragon> (raw)
In-Reply-To: <YD9DnWC4ht7AYjb/@smile.fi.intel.com>

On Wed, Mar 03, 2021 at 10:06:53AM +0200, Andy Shevchenko wrote:
> Since the mapping of those wake IRQs is totally platform specific, it needs a
> platform driver. On above mentioned x86 platforms we have a one you may take as
> an example (good or bad it's another story):
> drivers/platform/x86/intel_int0002_vgpio.c.
> 
> I think you will need something like this somewhere in ARM platform
> infrastructure in the Linux kernel.

Well, you have the Virtual GPIO controller defined in ACPI as device
"INT0002", but we do not have such a thing.  I'm not sure it makes much
sense to create a baseless driver.

> 
> That said, I don't see that those numbers are "broken", they have their own
> meaning and specific mapping to the real GPIOs and it's so platform specific,
> that we can't treat it as a quirk.

Those numbers have their own meaning only for Windows.  It's OS specific
rather than platform specific.  Snapdragon platform manual has explicit
numbering of every single GPIO pin.  Those broken numbers in ACPI table
violate the hardware specification and are *broken* to Linux which
implements GPIO driver properly.

Shawn

  reply	other threads:[~2021-03-03 12:58 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-26  3:39 [PATCH] gpiolib: acpi: support override broken GPIO number in ACPI table Shawn Guo
2021-02-26  9:12 ` Andy Shevchenko
2021-02-26  9:39   ` Shawn Guo
2021-02-26 10:57     ` Andy Shevchenko
2021-02-26 11:19       ` Andy Shevchenko
2021-02-27  3:19         ` Shawn Guo
2021-03-01 12:17           ` Andy Shevchenko
2021-03-02  0:27             ` Shawn Guo
2021-03-02 12:21               ` Andy Shevchenko
2021-03-03  5:02                 ` Jeffrey Hugo
2021-03-03  8:06                   ` Andy Shevchenko
2021-03-03  8:45                     ` Shawn Guo [this message]
2021-03-03  9:42                       ` Andy Shevchenko
2021-03-03 17:08                     ` Jeffrey Hugo
2021-03-03  9:43                   ` Shawn Guo
2021-03-03 15:10                     ` Jeffrey Hugo
2021-03-03 15:57                       ` Bjorn Andersson
2021-03-03 17:32                         ` Andy Shevchenko
2021-03-04  6:37                         ` Shawn Guo
2021-03-04  6:59                           ` Shawn Guo
2021-02-27  3:46       ` Shawn Guo
2021-03-01 12:19         ` Andy Shevchenko
2021-03-02  0:44           ` Shawn Guo
2021-03-02 10:36             ` Andy Shevchenko
2021-03-03  9:47 ` Andy Shevchenko
2021-03-04 19:32   ` Hans de Goede
2021-03-04 20:16     ` Andy Shevchenko
2021-03-05  1:14     ` Shawn Guo
2021-03-05  9:10       ` Hans de Goede
2021-03-05 10:08         ` Andy Shevchenko
2021-03-05 10:10           ` Andy Shevchenko
2021-03-05 11:26         ` Shawn Guo
2021-03-05 12:12           ` Hans de Goede

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