Re: [PATCH 13/16] media: ti-vpe: csi2rx: Add CSI2RX support

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Wed, Mar 31, 2021 at 10:44:57AM -0500, Benoit Parrot wrote:
> Pratyush,
> 
> Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> wrote on Wed [2021-Mar-31 09:06:35 +0300]:
> > Hi,
> > 
> > On 30/03/2021 20:33, Pratyush Yadav wrote:
> > > TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
> > > capture over a CSI-2 bus.
> > > 
> > > The Cadence CSI2RX IP acts as a bridge between the TI specific parts and
> > > the CSI-2 protocol parts. TI then has a wrapper on top of this bridge
> > > called the SHIM layer. It takes in data from stream 0, repacks it, and
> > > sends it to memory over PSI-L DMA.
> > > 
> > > This driver acts as the "front end" to V4L2 client applications. It
> > > implements the required ioctls and buffer operations, passes the
> > > necessary calls on to the bridge, programs the SHIM layer, and performs
> > > DMA via the dmaengine API to finally return the data to a buffer
> > > supplied by the application.
> > > 
> > > Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> > > ---
> > >   MAINTAINERS                               |   7 +
> > >   drivers/media/platform/Kconfig            |  11 +
> > >   drivers/media/platform/ti-vpe/Makefile    |   1 +
> > >   drivers/media/platform/ti-vpe/ti-csi2rx.c | 964 ++++++++++++++++++++++
> > >   4 files changed, 983 insertions(+)
> > >   create mode 100644 drivers/media/platform/ti-vpe/ti-csi2rx.c
> > 
> > Some quick comments:
> > 
> > "ti-vpe" directory is not correct, this has nothing to do with VPE. That
> > said, the directory has already been abused by having CAL driver there,
> > perhaps we should rename the directory just to "ti". But if we do that,
> > I think we should have subdirs for cal, vpe and this new one.
> 
> I agree with Tomi here. This should create a ti directory under
> media/platform and then add a directory under that specifically for this
> driver/IP as a first step. Not sure what the correct name for that
> directory should be but it should meaningful. As a follow on step then the
> other drivers can be relocated to a proper directory structure.

+1, including for the relocation if possible.

> > "ti-csi2rx" is rather generic name. TI has had CSI-2 RX IPs before (CAL)
> > and probably will also have new ones in the future. If there's no clear
> > model name for the IP, as I think is the case here, it's probably best
> > to just use the SoC model in the name. E.g. the DSS on J7 is
> > "ti,j721e-dss".
> > 
> > This driver implements the legacy video API. I think it would be better
> > (and easier to maintain) to only implement the media-controller API,
> > unless you specifically need to support the legacy API for existing
> > userspace.
> 
> We just went through a major rework with CAL to make it media controller
> compatible in order to be able to handle CSI2 virtual channels.
> I think as this is a new driver/IP which perform the same type of service
> it makes sense to make use the more current API instead of the legacy one.

+2 :-)

-- 
Regards,

Laurent Pinchart