linux-kernel - Re: [PATCH v4 06/15] dt-bindings: media: sun6i-a31-csi: Add MIPI CSI-2 input port

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Message-ID: <20210108094830.6cmuelnraxjpgmaf@gilmour>
Date:   Fri, 8 Jan 2021 10:48:30 +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, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v4 06/15] dt-bindings: media: sun6i-a31-csi: Add MIPI
 CSI-2 input port

On Thu, Dec 31, 2020 at 03:29:39PM +0100, Paul Kocialkowski wrote:
> The A31 CSI controller supports two distinct input interfaces:
> parallel and an external MIPI CSI-2 bridge. The parallel interface
> is often connected to a set of hardware pins while the MIPI CSI-2
> bridge is an internal FIFO-ish link. As a result, these two inputs
> are distinguished as two different ports.
> 
> Note that only one of the two may be present on a controller instance.
> For example, the V3s has one controller dedicated to MIPI-CSI2 and one
> dedicated to parallel.
> 
> Update the binding with an explicit ports node that holds two distinct
> port nodes: one for parallel input and one for MIPI CSI-2.
> 
> This is backward-compatible with the single-port approach that was
> previously taken for representing the parallel interface port, which
> stays enumerated as fwnode port 0.
> 
> Note that additional ports may be added in the future, especially to
> support feeding the CSI controller's output to the ISP.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Reviewed-by: Rob Herring <robh@...nel.org>

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

Maxime