linux-kernel - Re: [PATCH v3 20/22] dt-bindings: display: tegra: document Tegra20 and Tegra30 CSI

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251002015244.GA2836647-robh@kernel.org>
Date: Wed, 1 Oct 2025 20:52:44 -0500
From: Rob Herring <robh@...nel.org>
To: Svyatoslav Ryhel <clamor95@...il.com>
Cc: David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Sowjanya Komatineni <skomatineni@...dia.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jonas Schwöbel <jonasschwoebel@...oo.de>,
	Dmitry Osipenko <digetx@...il.com>,
	Charan Pedumuru <charan.pedumuru@...il.com>,
	Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>,
	Aaron Kling <webgeek1234@...il.com>, Arnd Bergmann <arnd@...db.de>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH v3 20/22] dt-bindings: display: tegra: document Tegra20
 and Tegra30 CSI

On Thu, Sep 25, 2025 at 06:16:46PM +0300, Svyatoslav Ryhel wrote:
> Document CSI HW block found in Tegra20 and Tegra30 SoC.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> ---
>  .../display/tegra/nvidia,tegra20-csi.yaml     | 135 ++++++++++++++++++
>  1 file changed, 135 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-csi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-csi.yaml b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-csi.yaml
> new file mode 100644
> index 000000000000..817b3097846b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-csi.yaml
> @@ -0,0 +1,135 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra20-csi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NVIDIA Tegra20 CSI controller
> +
> +maintainers:
> +  - Svyatoslav Ryhel <clamor95@...il.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nvidia,tegra20-csi
> +      - nvidia,tegra30-csi
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks: true
> +  clock-names: true
> +
> +  avdd-dsi-csi-supply:
> +    description: DSI/CSI power supply. Must supply 1.2 V.
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  "#nvidia,mipi-calibrate-cells":
> +    description:
> +      The number of cells in a MIPI calibration specifier. Should be 1.
> +      The single cell specifies an id of the pad that need to be
> +      calibrated for a given device. Valid pad ids for receiver would be
> +      0 for CSI-A; 1 for CSI-B; 2 for DSI-A and 3 for DSI-B.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    const: 1

Sorry I didn't bring this up before, but is this ever not 1? If it is 
fixed, then you don't really need the property. I prefer it just be 
fixed rather than getting a bunch of vendor specific #foo-cells.


> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +patternProperties:
> +  "^channel@[0-1]$":
> +    type: object
> +    description: channel 0 represents CSI-A and 1 represents CSI-B
> +    additionalProperties: false
> +
> +    properties:
> +      reg:
> +        maximum: 1
> +
> +      nvidia,mipi-calibrate:
> +        description: Should contain a phandle and a specifier specifying
> +          which pad is used by this CSI channel and needs to be calibrated.
> +        $ref: /schemas/types.yaml#/definitions/phandle-array

Sounds like only one entry? Then 'maxItems: 1' is needed. If you drop 
#nvidia,mipi-calibrate-cells, then you need to define the arg size too:

items:
  - items:
      - description: phandle to ...
      - description: what the arg contains.