linux-kernel - Re: [PATCH v4 07/15] media: sun6i-csi: Add support for MIPI CSI-2 bridge input

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Message-ID: <20210108095221.squax52u2knxxgoy@gilmour>
Date:   Fri, 8 Jan 2021 10:52:21 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-sunxi@...glegroups.com, Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com
Subject: Re: [PATCH v4 07/15] media: sun6i-csi: Add support for MIPI CSI-2
 bridge input

On Thu, Dec 31, 2020 at 03:29:40PM +0100, Paul Kocialkowski wrote:
> The A31 CSI controller supports a MIPI CSI-2 bridge input, which has
> its own dedicated port in the fwnode graph.
> 
> Support for this input is added with this change:
> - two pads are defined for the media entity instead of one
>   and only one needs to be connected at a time;
> - the pads currently match the fwnode graph representation;
> - links are created between our pads and the subdevs for each
>   interface and are no longer immutable so that userspace can select
>   which interface to use in case both are bound to a subdev;
> - fwnode endpoints are parsed and stored for each interface;
> - the active subdev (and fwnode endpoint) is retrieved when validating
>   the media link at stream on time and cleared at stream off;
> - an error is raised if both links are active at the same time;
> - the MIPI interface bit is set if the MIPI CSI-2 bridge endpoint is
>   active.
> 
> In the future, the media entity representation might evolve to:
> - distinguish the internal parallel bridge and data formatter;
> - represent each of the 4 internal channels that can exist between
>   the parallel bridge (for BT656 time-multiplex) and MIPI CSI-2
>   (internal channels can be mapped to virtual channels);
> - connect the controller's output to the ISP instead of its
>   DMA engine.
> 
> Finally note that the MIPI CSI-2 bridges should not be linked in
> the fwnode graph unless they have a sensor subdev attached.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Acked-by: Maxime Ripard <mripard@...nel.org>

Maxime

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