From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Dan Scally <djrscally@gmail.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Media Mailing List <linux-media@vger.kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
prabhakar.mahadev-lad.rj@bp.renesas.com, "Krogerus,
Heikki" <heikki.krogerus@linux.intel.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
laurent.pinchart+renesas@ideasonboard.com,
kieran.bingham+renesas@ideasonboard.com,
Jacopo Mondi <jacopo+renesas@jmondi.org>,
Rob Herring <robh@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Petr Mladek <pmladek@suse.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Tian Shu Qiu <tian.shu.qiu@intel.com>,
Bingbu Cao <bingbu.cao@intel.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Yong Zhi <yong.zhi@intel.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tsuchiya Yuto <kitakar@gmail.com>
Subject: Re: [RFC PATCH v3 9/9] ipu3-cio2: Add functionality allowing software_node connections to sensors on platforms designed for Windows
Date: Tue, 17 Nov 2020 18:42:29 +0200 [thread overview]
Message-ID: <CAHp75VcEb373m=WjP5nPtEUMiiKga2_5w1YPB-T=VtvjaFh7Ww@mail.gmail.com> (raw)
In-Reply-To: <3976eac8-2a21-a619-1dba-85212ac4b4b1@gmail.com>
On Tue, Nov 17, 2020 at 2:02 PM Dan Scally <djrscally@gmail.com> wrote:
>
> On 16/11/2020 16:16, Andy Shevchenko wrote:
> > On Mon, Nov 16, 2020 at 02:15:01PM +0000, Dan Scally wrote:
> >> On 16/11/2020 14:10, Laurent Pinchart wrote:
> >>> I thought we were looking for ACPI devices, not companion devices, in
> >>> order to extract information from the DSDT and store it in a software
> >>> node. I could very well be wrong though.
> >> This is correct - the code to fetch the various resources we're looking
> >> at all uses acpi_device. Whether using Andy's iterator suggestions or
> >> previous bus_for_each_dev(&acpi_bus_type...) I'm just getting the
> >> acpi_device via to_acpi_dev() and using that.
> > If you try to get an I²C ore SPI device out of pure ACPI device (with given
> > APCI _HID) you will fail. So, it's not correct. You are retrieving companion
> > devices, while they are still in the struct acpi_device.
> >
> > And don't ask me, why it's so. I wasn't designed that and didn't affect any
> > decision made there.
>
> Well, in terms of the actual device we're getting, I don't think we're
> fundamentally doing anything different between the methods...unless I'm
> really mistaken.
>
>
> Originally implementation was like:
>
>
> const char *supported_devices[] = {
>
> "OVTI2680",
>
> };
>
>
> static int cio2_bridge_connect_supported_devices(void)
>
> {
>
> struct acpi_device *adev;
>
> int i;
>
> for (i = 0; i < ARRAY_SIZE(supported_devices); i++) {
>
> adev =
> acpi_dev_get_first_match_dev(supported_devices[i], NULL, -1);
>
> ...
>
> }
>
>
> and acpi_dev_get_first_match_dev() likewise just returns adev via
> to_acpi_device(dev).
>
>
> So, maybe we don't need to do the iterating over all devices with
> matching _HID at all, in which case it can be dropped, but if we're
> doing it then I can't see that it's different to the original
> implementation in terms of the struct acpi_device we're working with or
> the route taken to get it.
>
>
> Either way; ACPI maintainers asked to be CC'd on the next patchset
> anyway, so they'll see what we're doing and be able to weigh in.
Implementation wise the two approaches are quite similar for now, indeed.
I would rather go with an iterator approach for a simple reason, EFI
code already has something which may utilize iterators rather than
using their home grown solution.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-11-17 16:42 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 22:58 [RFC PATCH v3 0/9] Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows Daniel Scally
2020-10-19 22:58 ` [RFC PATCH v3 1/9] software_node: Add helper function to unregister arrays of software_nodes ordered parent to child Daniel Scally
2020-10-20 9:22 ` Andy Shevchenko
2020-10-20 10:05 ` Sakari Ailus
2020-10-20 11:01 ` Andy Shevchenko
2020-10-20 11:02 ` Andy Shevchenko
2020-10-20 11:04 ` Heikki Krogerus
2020-10-20 22:52 ` Dan Scally
2020-10-21 9:40 ` Andy Shevchenko
2020-10-21 9:54 ` Dan Scally
2020-10-19 22:58 ` [RFC PATCH v3 2/9] lib/test_printf.c: Use helper function to unwind array of software_nodes Daniel Scally
2020-10-20 7:23 ` Petr Mladek
2020-10-20 9:20 ` Andy Shevchenko
2020-10-19 22:58 ` [RFC PATCH v3 3/9] software_node: Fix failure to hold refcount in software_node_get_next_child Daniel Scally
2020-10-20 12:44 ` Rafael J. Wysocki
2020-10-20 13:31 ` Sakari Ailus
2020-10-20 23:25 ` Dan Scally
2020-10-21 9:33 ` Andy Shevchenko
2020-10-21 9:37 ` Sakari Ailus
2020-10-21 9:56 ` Dan Scally
2020-10-19 22:58 ` [RFC PATCH v3 4/9] software_node: Add support for fwnode_graph*() family of functions Daniel Scally
2020-10-20 9:17 ` Andy Shevchenko
2020-10-20 12:35 ` Sakari Ailus
2020-10-20 13:32 ` Sakari Ailus
2020-10-19 22:58 ` [RFC PATCH v3 5/9] ipu3-cio2: Add T: entry to MAINTAINERS Daniel Scally
2020-10-20 9:16 ` Andy Shevchenko
2020-10-24 0:28 ` Laurent Pinchart
2020-10-19 22:59 ` [RFC PATCH v3 6/9] ipu3-cio2: Rename ipu3-cio2.c to allow module to be built from multiple sources files retaining ipu3-cio2 name Daniel Scally
2020-10-20 9:15 ` Andy Shevchenko
2020-10-20 20:41 ` Dan Scally
2020-10-24 0:34 ` Laurent Pinchart
2020-10-19 22:59 ` [RFC PATCH v3 7/9] ipu3-cio2: Check if pci_dev->dev's fwnode is a software_node in cio2_parse_firmware() and set FWNODE_GRAPH_DEVICE_DISABLED if so Daniel Scally
2020-10-20 9:19 ` Andy Shevchenko
2020-10-20 12:06 ` Sakari Ailus
2020-10-20 19:56 ` Dan Scally
2020-10-20 22:49 ` Sakari Ailus
2020-10-20 22:55 ` Dan Scally
2020-10-24 0:39 ` Laurent Pinchart
2020-10-24 14:29 ` Sakari Ailus
2020-10-24 16:33 ` Dan Scally
2020-10-24 16:55 ` Laurent Pinchart
2020-10-19 22:59 ` [RFC PATCH v3 8/9] media: v4l2-core: v4l2-async: Check possible match in match_fwnode based on sd->fwnode->secondary Daniel Scally
2020-10-19 22:59 ` [RFC PATCH v3 9/9] ipu3-cio2: Add functionality allowing software_node connections to sensors on platforms designed for Windows Daniel Scally
2020-10-20 9:41 ` Andy Shevchenko
2020-10-21 22:05 ` Daniel Scally
2020-10-22 13:40 ` Andy Shevchenko
2020-10-23 10:06 ` Dan Scally
2020-10-24 1:24 ` Laurent Pinchart
2020-10-24 8:50 ` Dan Scally
2020-10-24 9:37 ` Laurent Pinchart
2020-10-24 22:28 ` Daniel Scally
2020-10-24 22:36 ` Laurent Pinchart
2020-10-24 22:50 ` Daniel Scally
2020-10-26 8:20 ` Dan Scally
2020-10-26 16:05 ` Andy Shevchenko
2020-10-29 20:17 ` Laurent Pinchart
2020-10-29 22:36 ` Dan Scally
2020-10-26 16:10 ` Andy Shevchenko
2020-10-29 20:19 ` Laurent Pinchart
2020-10-29 20:26 ` Andy Shevchenko
2020-10-29 21:29 ` Laurent Pinchart
2020-10-29 22:22 ` Andy Shevchenko
2020-10-29 22:51 ` Laurent Pinchart
2020-11-13 10:02 ` Dan Scally
2020-11-13 16:22 ` Laurent Pinchart
2020-11-13 19:45 ` Andy Shevchenko
2020-11-15 8:45 ` Daniel Scally
2020-11-16 8:53 ` Laurent Pinchart
2020-11-16 13:57 ` Andy Shevchenko
2020-11-16 14:10 ` Laurent Pinchart
2020-11-16 14:15 ` Dan Scally
2020-11-16 16:16 ` Andy Shevchenko
2020-11-17 12:01 ` Dan Scally
2020-11-17 16:42 ` Andy Shevchenko [this message]
2020-11-17 22:59 ` Dan Scally
2020-10-24 15:11 ` Sakari Ailus
2020-10-24 15:14 ` Sakari Ailus
2020-10-24 20:28 ` Dan Scally
2020-10-25 11:18 ` Sakari Ailus
2020-10-20 9:24 ` [RFC PATCH v3 0/9] Add functionality to ipu3-cio2 driver " Andy Shevchenko
2020-10-20 13:38 ` Rafael J. Wysocki
2020-10-21 20:59 ` Daniel Scally
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