From: Eric Anholt <eric@anholt.net>
To: Archit Taneja <architt@codeaurora.org>,
dri-devel@lists.freedesktop.org,
Andrzej Hajda <a.hajda@samsung.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Thierry Reding <thierry.reding@gmail.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/8] drm: Allow DSI devices to be registered before the host registers.
Date: Fri, 14 Jul 2017 15:58:43 -0700 [thread overview]
Message-ID: <87vamu7hi4.fsf@eliezer.anholt.net> (raw)
In-Reply-To: <6fbaa797-1040-48e8-c361-dad4363cd30d@codeaurora.org>
[-- Attachment #1.1: Type: text/plain, Size: 1846 bytes --]
Archit Taneja <architt@codeaurora.org> writes:
> On 06/28/2017 01:28 AM, Eric Anholt wrote:
>> When a mipi_dsi_host is registered, the DT is walked to find any child
>> nodes with compatible strings. Those get registered as DSI devices,
>> and most DSI panel drivers are mipi_dsi_drivers that attach to those nodes.
>>
>> There is one special case currently, the adv7533 bridge, where the
>> bridge probes on I2C, and during the bridge attach step it looks up
>> the mipi_dsi_host and registers the mipi_dsi_device (for its own stub
>> mipi_dsi_driver).
>>
>> For the Raspberry Pi panel, though, we also need to attach on I2C (our
>> control bus), but don't have a bridge driver. The lack of a bridge's
>> attach() step like adv7533 uses means that we aren't able to delay the
>> mipi_dsi_device creation until the mipi_dsi_host is present.
>>
>> To fix this, we extend mipi_dsi_device_register_full() to allow being
>> called with a NULL host, which puts the device on a queue waiting for
>> a host to appear. When a new host is registered, we fill in the host
>> value and finish the device creation process.
>
> This is quite a nice idea. The only bothering thing is the info.of_node usage
> varies between child nodes (mipi_dsi_devs) and non-child nodes (i2c control
> bus).
>
> For DSI children expressed in DT, the of_node in info holds the DT node
> corresponding to the DSI child itself. For non-DT ones, this patch assumes
> that info.of_node stores the DSI host DT node. I think it should be okay as
> long as we mention the usage in a comment somewhere. The other option is to
> have a new info.host_node field to keep a track of the host DT node.
I think maybe you misread the patch? We're using
of_get_parent(dsi->dev.node), which came from info->node, to compare to
host->dev->of_node().
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
[-- Attachment #2: Type: text/plain, Size: 160 bytes --]
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2017-07-14 22:58 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-27 19:58 [PATCH 0/8] RPi touchscreen panel driver v4 Eric Anholt
2017-06-27 19:58 ` [PATCH 1/8] drm/vc4: Fix DSI T_INIT timing Eric Anholt
2017-06-29 9:02 ` Andrzej Hajda
2017-06-27 19:58 ` [PATCH 2/8] drm/vc4: Fix misleading name of the continuous flag Eric Anholt
2017-06-29 9:03 ` Andrzej Hajda
2017-06-27 19:58 ` [PATCH 3/8] drm/vc4: Use drm_mode_vrefresh() in DSI fixup, in case vrefresh is 0 Eric Anholt
2017-06-29 9:24 ` Andrzej Hajda
2017-06-27 19:58 ` [PATCH 4/8] drm/bridge: Add a devm_ allocator for panel bridge Eric Anholt
2017-06-29 9:30 ` Andrzej Hajda
2017-06-27 19:58 ` [PATCH 5/8] drm/vc4: Delay DSI host registration until the panel has probed Eric Anholt
2017-06-29 9:42 ` Andrzej Hajda
2017-06-27 19:58 ` [PATCH 6/8] drm: Allow DSI devices to be registered before the host registers Eric Anholt
2017-06-29 5:03 ` Archit Taneja
2017-06-29 10:39 ` Andrzej Hajda
2017-06-29 15:22 ` Eric Anholt
2017-06-30 8:48 ` Andrzej Hajda
2017-07-03 10:56 ` Archit Taneja
2017-07-14 23:01 ` Eric Anholt
2017-07-17 13:39 ` Archit Taneja
2017-07-14 22:58 ` Eric Anholt [this message]
2017-07-17 4:26 ` Archit Taneja
2017-07-18 20:13 ` Eric Anholt
2017-07-19 3:29 ` Archit Taneja
2017-08-04 9:29 ` Boris Brezillon
2017-06-27 19:58 ` [PATCH 7/8] dt-bindings: Document the Raspberry Pi Touchscreen nodes Eric Anholt
2017-06-27 19:58 ` [PATCH 8/8] drm/panel: Add support for the Raspberry Pi 7" Touchscreen Eric Anholt
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=87vamu7hi4.fsf@eliezer.anholt.net \
--to=eric@anholt.net \
--cc=Laurent.pinchart@ideasonboard.com \
--cc=a.hajda@samsung.com \
--cc=architt@codeaurora.org \
--cc=boris.brezillon@free-electrons.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=thierry.reding@gmail.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).