linux-kernel - Re: [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of acpi device

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Date:   Fri, 21 May 2021 20:25:24 +0100
From:   Daniel Scally <djrscally@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>,
        Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Mark Gross <mgross@...ux.intel.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of
 acpi device

Hi Rafael

On 20/05/2021 19:55, Rafael J. Wysocki wrote:
> On Thu, May 20, 2021 at 8:33 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>> On Thu, May 20, 2021 at 4:11 PM Daniel Scally <djrscally@...il.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@...il.com>
>>> Signed-off-by: Daniel Scally <djrscally@...il.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?


Sure; fine by me, and same for the other function