linux-kernel - Re: [PATCH 00/14] Allwinner MIPI CSI-2 support for A31/V3s/A83T

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Message-ID: <20201026172020.u6nxsvpqnilo4ghe@gilmour.lan>
Date:   Mon, 26 Oct 2020 18:20:20 +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,
        devel@...verdev.osuosl.org, linux-sunxi@...glegroups.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Yong Deng <yong.deng@...ewell.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hans Verkuil <hverkuil@...all.nl>, kevin.lhopital@...mail.com
Subject: Re: [PATCH 00/14] Allwinner MIPI CSI-2 support for A31/V3s/A83T

On Fri, Oct 23, 2020 at 07:45:32PM +0200, Paul Kocialkowski wrote:
> This series introduces support for MIPI CSI-2, with the A31 controller that is
> found on most SoCs (A31, V3s and probably V5) as well as the A83T-specific
> controller. While the former uses the same MIPI D-PHY that is already supported
> for DSI, the latter embeds its own D-PHY.
> 
> In order to distinguish the use of the D-PHY between Rx mode (for MIPI CSI-2)
> and Tx mode (for MIPI DSI), a submode is introduced for D-PHY in the PHY API.
> This allows adding Rx support in the A31 D-PHY driver.
> 
> A few changes and fixes are applied to the A31 CSI controller driver, in order
> to support the MIPI CSI-2 use-case.
> 
> Follows is the V4L2 device topology representing the interactions between
> the MIPI CSI-2 sensor, the MIPI CSI-2 controller (which controls the D-PHY)
> and the CSI controller:
> - entity 1: sun6i-csi (1 pad, 1 link)
>             type Node subtype V4L flags 0
>             device node name /dev/video0
> 	pad0: Sink
> 		<- "sun6i-mipi-csi2":1 [ENABLED,IMMUTABLE]
> 
> - entity 5: sun6i-mipi-csi2 (2 pads, 2 links)
>             type V4L2 subdev subtype Unknown flags 0
> 	pad0: Sink
> 		<- "ov5648 0-0036":0 [ENABLED,IMMUTABLE]
> 	pad1: Source
> 		-> "sun6i-csi":0 [ENABLED,IMMUTABLE]
> 
> - entity 8: ov5648 0-0036 (1 pad, 1 link)
>             type V4L2 subdev subtype Sensor flags 0
>             device node name /dev/v4l-subdev0
> 	pad0: Source
> 		[fmt:SBGGR8_1X8/640x480@...0 field:none colorspace:raw xfer:none ycbcr:601 quantization:full-range]
> 		-> "sun6i-mipi-csi2":0 [ENABLED,IMMUTABLE]
> 
> Happy reviewing!

I mentioned it to Kevin in the first version, but you should have a
v4l2-compliance run here.

If you have some time, it would be great to run libcamera as well.

Maxime

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