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From: Daniel Scally <djrscally@gmail.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
	linus.walleij@linaro.org,
	prabhakar.mahadev-lad.rj@bp.renesas.com,
	heikki.krogerus@linux.intel.com, dmitry.torokhov@gmail.com,
	laurent.pinchart+renesas@ideasonboard.com,
	kieran.bingham+renesas@ideasonboard.com,
	jacopo+renesas@jmondi.org, robh@kernel.org, davem@davemloft.net,
	linux@rasmusvillemoes.dk, andriy.shevchenko@linux.intel.com,
	sergey.senozhatsky@gmail.com, rostedt@goodmis.org,
	pmladek@suse.com, mchehab@kernel.org, tian.shu.qiu@intel.com,
	bingbu.cao@intel.com, sakari.ailus@linux.intel.com,
	yong.zhi@intel.com, rafael@kernel.org,
	gregkh@linuxfoundation.org, 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: Sat, 24 Oct 2020 23:50:45 +0100	[thread overview]
Message-ID: <98d1f782-9749-1de7-02d5-da51b57ffaef@gmail.com> (raw)
In-Reply-To: <20201024223628.GG3943@pendragon.ideasonboard.com>

Hi Laurent

On 24/10/2020 23:36, Laurent Pinchart wrote:
> Hi Dan,
>
> On Sat, Oct 24, 2020 at 11:28:06PM +0100, Daniel Scally wrote:
>> On 24/10/2020 10:37, Laurent Pinchart wrote:
>>
>>>>> I wonder if we could avoid depending on the I2C device being created by
>>>>> getting the fwnode from adev, and setting ->secondary manually. adev
>>>>> would need to be passed to get_acpi_ssdb_sensor_data() instead of dev.
>>>> Let me try that; I initially wanted to do
>>>> set_secondary_fwnode(&adev->dev, fwnode) to avoid depending on the I2C
>>>> dev being created but it turns out &adev->dev isn't the same pointer. I
>>>> shall try it and see.
>> Actually, thinking on this further I think maybe we can't avoid that -
>> it's not actually in this patch series but during assigning GPIO
>> resources parsed from PMIC's ACPI node to the sensor, I'm using
>> dev_name() on the i2c dev to pass to .dev_id member of gpiod_lookup_table
> Any chance we can construct the I2C device name from the ACPI device,
> the same way that the ACPI/I2C core does ? It may be a dead end, but if
> we could avoid depending on the I2C device, I think it will make
> initialization easier. I have a feeling that will be difficult though,
> as we'll need the I2C bus number, which won't be readily available.

I'd have to look into how the ACPI/I2C core does it to be confident, but
I think it would be ok. Doesn't look to me like the bus number is
involved; my sensor's device names come through as "i2c-OVTI2680:00";
that's just a prefix tacked on to dev_name(adev->dev). I'm sure there's
something that will stop it being quite so easy, but hopefully not
insurmountable.

> Maybe this calls for extending the gpiod lookup API, but that would then
> likely be something we would build on top. I'm thinking about a way to
> specify the GPIO mapping in the software node, and retrieving it from
> there, the same way this is done for GPIOs in OF-based systems.
Yeah that's an option too; I had had the same thought actually. Probably
an extensive piece of work in its own right though

  reply	other threads:[~2020-10-24 22:50 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 [this message]
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
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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