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Date: Fri, 16 Sep 2022 15:15:44 +0200
From: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
To: Mikhail Rudenko <mike.rudenko@...il.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Jacopo Mondi <jacopo@...ndi.org>,
Shawn Tu <shawnx.tu@...el.com>,
Christian Hemp <c.hemp@...tec.de>,
Arec Kao <arec.kao@...el.com>, Arnd Bergmann <arnd@...db.de>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Daniel Scally <djrscally@...il.com>,
Jimmy Su <jimmy.su@...el.com>, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] media: dt-bindings: media: i2c: document OV4689
DT bindings
Hi Mikhail,
On Thu, Sep 15, 2022 at 11:11:57PM +0300, Mikhail Rudenko wrote:
>
> Hi Tommaso,
>
> On 2022-09-13 at 16:05 +02, Tommaso Merciai <tommaso.merciai@...rulasolutions.com> wrote:
> > Hi Mikhail,
> >
> > On Sun, Sep 11, 2022 at 11:01:34PM +0300, Mikhail Rudenko wrote:
> >> Add device-tree binding documentation for OV4689 image sensor driver,
> >> and the relevant MAINTAINERS entries.
> >>
> >> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
> >> ---
> >> .../bindings/media/i2c/ovti,ov4689.yaml | 141 ++++++++++++++++++
> >> MAINTAINERS | 7 +
> >> 2 files changed, 148 insertions(+)
> >> create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov4689.yaml
> >>
> >> diff --git a/Documentation/devicetree/bindings/media/i2c/ovti,ov4689.yaml b/Documentation/devicetree/bindings/media/i2c/ovti,ov4689.yaml
> >> new file mode 100644
> >> index 000000000000..376330b5572a
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/media/i2c/ovti,ov4689.yaml
> >> @@ -0,0 +1,141 @@
> >> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> >> +%YAML 1.2
> >> +---
> >> +$id: http://devicetree.org/schemas/media/i2c/ovti,ov4689.yaml#
> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >> +
> >> +title: Omnivision OV4689 CMOS
> >> +
> >> +maintainers:
> >> + - Mikhail Rudenko <mike.rudenko@...il.com>
> >> +
> >> +description: |
> >> + The Omnivision OV4689 is a high performance, 1/3-inch, 4 megapixel
> >> + image sensor. Ihis chip supports high frame rate speeds up to 90 fps
> >> + at 2688x1520 resolution. It is programmable through an I2C
> >> + interface, and sensor output is sent via 1/2/4 lane MIPI CSI-2
> >> + connection.
> >> +
> >> +allOf:
> >> + - $ref: /schemas/media/video-interface-devices.yaml#
> >> +
> >> +properties:
> >> + compatible:
> >> + const: ovti,ov4689
> >> +
> >> + reg:
> >> + maxItems: 1
> >> +
> >> + clocks:
> >> + description:
> >> + External clock (XVCLK) for the sensor, 6-64 MHz
> >> + maxItems: 1
> >> +
> >> + clock-names: true
> >> +
> >> + dovdd-supply:
> >> + description:
> >> + Digital I/O voltage supply, 1.7-3.0 V
> >> +
> >> + avdd-supply:
> >> + description:
> >> + Analog voltage supply, 2.6-3.0 V
> >> +
> >> + dvdd-supply:
> >> + description:
> >> + Digital core voltage supply, 1.1-1.3 V
> >> +
> >> + powerdown-gpios:
> >> + maxItems: 1
> >> + description:
> >> + GPIO connected to the powerdown pin (active low)
> >> +
> >> + reset-gpios:
> >> + maxItems: 1
> >> + description:
> >> + GPIO connected to the reset pin (active low)
> >> +
> >> + orientation: true
> >> +
> >> + rotation: true
> >> +
> >> + port:
> >> + $ref: /schemas/graph.yaml#/$defs/port-base
> >> + additionalProperties: false
> >> + description:
> >> + Output port node, single endpoint describing the CSI-2 transmitter
> >> +
> >> + properties:
> >> + endpoint:
> >> + $ref: /schemas/media/video-interfaces.yaml#
> >> + unevaluatedProperties: false
> >> +
> >> + properties:
> >> + data-lanes:
> >> + oneOf:
> >> + - items:
> >> + - const: 1
> >> + - const: 2
> >> + - const: 3
> >> + - const: 4
> >> + - items:
> >> + - const: 1
> >> + - const: 2
> >> + - items:
> >> + - const: 1
> >> + link-frequencies: true
> >> +
> >> + required:
> >> + - data-lanes
> >> + - link-frequencies
> >> +
> >> +required:
> >> + - compatible
> >> + - reg
> >> + - clocks
> >> + - clock-names
> >> + - dovdd-supply
> >> + - avdd-supply
> >> + - dvdd-supply
> >> + - powerdown-gpios
> >> + - reset-gpios
> >> + - port
> >
> > I think we don't need all of these entries as required.
> > The only let me say "really" required are:
> >
> > - compatible
> > - reg
> > - clocks
> > - port
>
> Thanks for the review! I agree that the driver may be modified to work
> without powerdown and reset gpios and they are not required for sensor
> operation. On contrary, supplies are obviously required. Of course, linux
> provides dummy regulators if supplies are missing from device tree, but
> I though the intention was to document hardware, not implementation
> details. What do think of this?
We have already discuss on this on the following thread sometimes ago :)
https://www.patchwork.linux-fancy.com/project/linux-fancy/patch/20220630134835.592521-6-tommaso.merciai@amarulasolutions.com/
Take a look and let me know.
Thanks,
Tommaso
>
> > Regards,
> > Tommaso
>
> --
> Best regards,
> Mikhail Rudenko
--
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@...rulasolutions.com
__________________________________
Amarula Solutions SRL
Via Le Canevare 30, 31100 Treviso, Veneto, IT
T. +39 042 243 5310
info@...rulasolutions.com
www.amarulasolutions.com
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