linux-kernel - Re: [PATCH v12 1/8] dt-bindings: media: platform: visconti: Add Toshiba Visconti MIPI CSI-2 Receiver

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Message-ID: <20241226161547.GB554@pendragon.ideasonboard.com>
Date: Thu, 26 Dec 2024 18:15:47 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: yuji2.ishikawa@...hiba.co.jp, mchehab@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org,
	sakari.ailus@...ux.intel.com, hverkuil-cisco@...all.nl,
	nobuhiro1.iwamatsu@...hiba.co.jp, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v12 1/8] dt-bindings: media: platform: visconti: Add
 Toshiba Visconti MIPI CSI-2 Receiver

On Tue, Dec 17, 2024 at 06:44:58AM +0100, Krzysztof Kozlowski wrote:
> On 17/12/2024 00:57, yuji2.ishikawa@...hiba.co.jp wrote:
> >> On 25/11/2024 10:21, Yuji Ishikawa wrote:
> >>> Adds the Device Tree binding documentation that allows to describe the
> >>> MIPI CSI-2 Receiver found in Toshiba Visconti SoCs.
> >>>
> >>> Signed-off-by: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
> >>> Reviewed-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> >>
> >> How newly added patch can have already Rb tag? Was this review really, really
> >> performed internally or you just satisfy some internal managers requirements
> >> and fake the stats?
> >>
> > 
> > I added this Reviewed-by tag because the patch was reviewed internally.
> 
> What issues were identified by internal review, especially in the
> context of bindings?
> 
> >>> ---
> >>>
> >>> Changelog v12:
> >>> - Newly add bindings for CSI2RX driver
> >>>
> >>>  .../media/toshiba,visconti5-csi2rx.yaml       | 104
> >> ++++++++++++++++++
> >>>  1 file changed, 104 insertions(+)
> >>>  create mode 100644
> >>> Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yaml
> >>>
> >>> diff --git
> >>> a/Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yam
> >>> l
> >>> b/Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yam
> >>> l
> >>> new file mode 100644
> >>> index 000000000000..5488072bc82a
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx
> >>> +++ .yaml
> >>> @@ -0,0 +1,104 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
> >>> +---
> >>> +$id:
> >>> +http://devicetree.org/schemas/media/toshiba,visconti5-csi2rx.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: Toshiba Visconti5 SoC MIPI CSI-2 receiver
> >>> +
> >>> +maintainers:
> >>> +  - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> >>> +
> >>> +description: |-
> >>
> >> Drop |-
> >>
> > 
> > I'll drop "|-"
> > 
> >>> +  Toshiba Visconti5 SoC MIPI CSI-2 receiver device receives MIPI
> >>> + CSI-2 video  stream. Use with VIIF device. T.B.D
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    const: toshiba,visconti5-csi2rx
> >>
> >> Why this is called "RX"? Can you have a TX? I had impression that one cannot.
> >>
> > 
> > VIIF has only MIPI CSI2 receiver (CSI2RX). There's no TX for it.
> 
> So this device cannot be anything else? Then drop rx.

It's a compatible string, it identifies the IP core. As the SoC also has
a CSI-2 transmitter (as mentioned by Ishikawa-san), it makes sense to
name the CSI-2 receiver csi2rx.

> > Visconti also has VOIF (Video Output Interface) hardware which has
> > MIPI CSI2 (not DSI) transmitter (CSI2TX).
> 
> Or this can be something else? Confusing.

In a camera capture pipeline the CSI-2 interface of the SoC is a CSI-2
receiver, but SoCs commonly have CSI-2 transmitters as well (even if
that's less common than receivers).

-- 
Regards,

Laurent Pinchart