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Date: Fri, 16 Sep 2022 16:42:25 +0300
From: Mikhail Rudenko <mike.rudenko@...il.com>
To: Tommaso Merciai <tommaso.merciai@...rulasolutions.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
On 2022-09-16 at 15:15 +02, Tommaso Merciai <tommaso.merciai@...rulasolutions.com> wrote:
> 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.
Okay, if there already is a consensus regarding this matter, I'll make
the regulators optional in v3.
--
Best regards,
Mikhail Rudenko
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