linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Daniel Scally <djrscally@gmail.com>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	 Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Wolfram Sang <wsa@kernel.org>,  Lee Jones <lee.jones@linaro.org>,
	Hans de Goede <hdegoede@redhat.com>,
	 Maximilian Luz <luzmaximilian@gmail.com>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	 ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	linux-i2c <linux-i2c@vger.kernel.org>,
	 Platform Driver <platform-driver-x86@vger.kernel.org>,
	 "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)"
	<devel@acpica.org>, Len Brown <lenb@kernel.org>,
	 Mika Westerberg <mika.westerberg@linux.intel.com>,
	Russell King <linux@armlinux.org.uk>,
	 Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	 Mark Gross <mgross@linux.intel.com>,
	Robert Moore <robert.moore@intel.com>,
	 Erik Kaneda <erik.kaneda@intel.com>,
	 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	 Kieran Bingham <kieran.bingham@ideasonboard.com>,
	 Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: Re: [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of acpi device
Date: Thu, 20 May 2021 20:55:14 +0200	[thread overview]
Message-ID: <CAJZ5v0hdSi4BcZvhkyrtcBQqRL8CHtOtwUeYW7EnWL2zvKhDZw@mail.gmail.com> (raw)
In-Reply-To: <CAJZ5v0hoDswjr+7r4uf6jZvV3t+-UDtEA0V7A_MvdT_34XrbJA@mail.gmail.com>

On Thu, May 20, 2021 at 8:33 PM Rafael J. Wysocki <rafael@kernel.org> wrote:
>
> On Thu, May 20, 2021 at 4:11 PM Daniel Scally <djrscally@gmail.com> wrote:
> >
> > In some ACPI tables we encounter, devices use the _DEP method to assert
> > a dependence on other ACPI devices as opposed to the OpRegions that the
> > specification intends. We need to be able to find those devices "from"
> > the dependee, so add a callback and a wrapper to walk over the
> > acpi_dep_list and return the dependent ACPI device.
> >
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> > Signed-off-by: Daniel Scally <djrscally@gmail.com>
> > ---
> > Changes since v3:
> >
> >         Both new functions were renamed.
> >
> >  drivers/acpi/scan.c     | 38 ++++++++++++++++++++++++++++++++++++++
> >  include/acpi/acpi_bus.h |  1 +
> >  2 files changed, 39 insertions(+)
> >
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > index 195635c3462b..1a76fbdfa669 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -2105,6 +2105,21 @@ static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
> >                 device->handler->hotplug.notify_online(device);
> >  }
> >
> > +static int acpi_return_dep_dev(struct acpi_dep_data *dep, void *data)
>
> What about calling this acpi_get_first_consumer_cb()?

Or acpi_dev_get_first_consumer_dev_cb() if you want to be super-precise?

>
> > +{
> > +       struct acpi_device *adev;
> > +       int ret;
> > +
> > +       ret = acpi_bus_get_device(dep->consumer, &adev);
> > +       if (ret)
> > +               /* If we don't find an adev then we want to continue parsing */
> > +               return 0;
> > +
> > +       *(struct acpi_device **)data = adev;
>
> And it can do the get_device() here, can't it?
>
> So maybe use acpi_bus_get_acpi_device() instead of
> acpi_bus_get_device()?  Would be simpler.
>
> > +
> > +       return 1;
> > +}
> > +
> >  static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
> >  {
> >         struct acpi_device *adev;
> > @@ -2168,6 +2183,29 @@ void acpi_dev_clear_dependencies(struct acpi_device *supplier)
> >  }
> >  EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
> >
> > +/**
> > + * acpi_dev_get_dependent_dev - Return ACPI device dependent on @supplier
>
> And what about calling this acpi_get_first_consumer() ?

Or acpi_dev_get_first_consumer_dev() (in analogy with the above)?

> > + * @supplier: Pointer to the dependee device
> > + *
> > + * Returns the first &struct acpi_device which declares itself dependent on
> > + * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
> > + *
> > + * The caller is responsible for putting the reference to adev when it is no
> > + * longer needed.
> > + */
> > +struct acpi_device *acpi_dev_get_dependent_dev(struct acpi_device *supplier)
> > +{
> > +       struct acpi_device *adev = NULL;
> > +
> > +       acpi_walk_dep_device_list(supplier->handle, acpi_return_dep_dev, &adev);
> > +
> > +       if (adev)
> > +               get_device(&adev->dev);
> > +
> > +       return adev;
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_dev_get_dependent_dev);
> > +
> >  /**
> >   * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
> >   * @handle: Root of the namespace scope to scan.
> > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> > index 0b2c4f170f4d..68d378207704 100644
> > --- a/include/acpi/acpi_bus.h
> > +++ b/include/acpi/acpi_bus.h
> > @@ -692,6 +692,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
> >  bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2);
> >
> >  void acpi_dev_clear_dependencies(struct acpi_device *supplier);
> > +struct acpi_device *acpi_dev_get_dependent_dev(struct acpi_device *supplier);
> >  struct acpi_device *
> >  acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv);
> >  struct acpi_device *
> > --
> > 2.25.1
> >

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-05-20 18:57 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-20 14:09 [PATCH v4 0/8] Introduce intel_skl_int3472 module Daniel Scally
2021-05-20 14:09 ` [PATCH v4 1/8] ACPI: scan: Extend acpi_walk_dep_device_list() Daniel Scally
2021-05-20 17:15   ` Maximilian Luz
2021-05-20 18:22   ` Rafael J. Wysocki
2021-05-20 21:03     ` Hans de Goede
2021-05-21 12:59   ` Andy Shevchenko
2021-05-20 14:09 ` [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of acpi device Daniel Scally
2021-05-20 18:33   ` Rafael J. Wysocki
2021-05-20 18:55     ` Rafael J. Wysocki [this message]
2021-05-21 19:25       ` Daniel Scally
2021-05-20 14:09 ` [PATCH v4 3/8] i2c: core: Add a format macro for I2C device names Daniel Scally
2021-05-20 14:09 ` [PATCH v4 4/8] gpiolib: acpi: Export acpi_get_gpiod() Daniel Scally
2021-05-20 14:09 ` [PATCH v4 5/8] clkdev: Make clkdev_drop() null aware Daniel Scally
2021-05-20 14:09 ` [PATCH v4 6/8] gpiolib: acpi: Add acpi_gpio_get_io_resource() Daniel Scally
2021-05-21 12:05   ` Andy Shevchenko
2021-05-25 22:30     ` Daniel Scally
2021-05-20 14:09 ` [PATCH v4 7/8] platform/x86: Add intel_skl_int3472 driver Daniel Scally
2021-05-21 12:57   ` Andy Shevchenko
2021-05-25 22:53     ` Daniel Scally
2021-05-26  7:54       ` Andy Shevchenko
2021-05-20 14:09 ` [PATCH v4 8/8] mfd: tps68470: Remove tps68470 MFD driver Daniel Scally
2021-05-25 13:10 ` [PATCH v4 0/8] Introduce intel_skl_int3472 module Hans de Goede
2021-05-25 13:12   ` Hans de Goede
2021-05-25 13:23     ` Andy Shevchenko
2021-05-25 23:03   ` Daniel Scally
2021-05-26  7:55     ` Andy Shevchenko
2021-05-26 12:36     ` Hans de Goede

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAJZ5v0hdSi4BcZvhkyrtcBQqRL8CHtOtwUeYW7EnWL2zvKhDZw@mail.gmail.com \
    --to=rafael@kernel.org \
    --cc=andriy.shevchenko@linux.intel.com \
    --cc=andy.shevchenko@gmail.com \
    --cc=bgolaszewski@baylibre.com \
    --cc=devel@acpica.org \
    --cc=djrscally@gmail.com \
    --cc=erik.kaneda@intel.com \
    --cc=hdegoede@redhat.com \
    --cc=kieran.bingham@ideasonboard.com \
    --cc=laurent.pinchart@ideasonboard.com \
    --cc=lee.jones@linaro.org \
    --cc=lenb@kernel.org \
    --cc=linus.walleij@linaro.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-gpio@vger.kernel.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@armlinux.org.uk \
    --cc=luzmaximilian@gmail.com \
    --cc=mgross@linux.intel.com \
    --cc=mika.westerberg@linux.intel.com \
    --cc=platform-driver-x86@vger.kernel.org \
    --cc=rafael.j.wysocki@intel.com \
    --cc=robert.moore@intel.com \
    --cc=wsa@kernel.org \
    --subject='Re: [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of acpi device' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).