linux-kernel - Re: [PATCH v2 2/3] media: rockchip: add driver for the rockchip mipi csi-2 receiver

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Message-ID: <554971e1-6fde-4b2c-a2de-fe178358a4e3@collabora.com>
Date: Tue, 18 Nov 2025 19:59:14 +0100
From: Michael Riesch <michael.riesch@...labora.com>
To: Frank Li <Frank.li@....com>
Cc: Mehdi Djait <mehdi.djait@...ux.intel.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Hans Verkuil <hverkuil@...nel.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Nicolas Dufresne <nicolas.dufresne@...labora.com>,
 Collabora Kernel Team <kernel@...labora.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] media: rockchip: add driver for the rockchip mipi
 csi-2 receiver

Hi Frank,

On 11/18/25 18:15, Frank Li wrote:
> On Tue, Nov 18, 2025 at 12:12:26PM +0100, Michael Riesch via B4 Relay wrote:
>> From: Michael Riesch <michael.riesch@...labora.com>
>>
>>[...]
>> +#define CSI2HOST_N_LANES     0x04
>> +#define CSI2HOST_CSI2_RESETN 0x10
>> +#define CSI2HOST_PHY_STATE   0x14
>> +#define CSI2HOST_ERR1	     0x20
>> +#define CSI2HOST_ERR2	     0x24
>> +#define CSI2HOST_MSK1	     0x28
>> +#define CSI2HOST_MSK2	     0x2c
>> +#define CSI2HOST_CONTROL     0x40
> 
> Look like that is designware CSI2 controller, can we build common library
> for all dwc csi2 controller, instead of every vendor create individual one.
> 
> First try at
> https://lore.kernel.org/linux-media/20250821-95_cam-v3-21-c9286fbb34b9@nxp.com/
> 
> Toshiba have similar patch
> https://lore.kernel.org/linux-media/aPZd39riAxqfw3mT@lizhi-Precision-Tower-5810/
> 
> Frank

This has been discussed already a while ago:
https://lore.kernel.org/all/20250507083837.GA11152@pendragon.ideasonboard.com/

Bottom line from Laurent:

"Let's keep this driver Rockchip-specific then. Thanks for checking."

>  [...]
Best regards,
Michael