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Date: Fri, 20 Mar 2020 16:48:36 -0600
From: Rob Herring <robh@...nel.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Lad Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v4 5/5] media: dt-bindings: media: i2c: convert ov5645
bindings to json-schema
On Thu, Mar 19, 2020 at 05:10:35PM +0200, Laurent Pinchart wrote:
> Hi Prabhakar,
>
> Thank you for the patch.
>
> On Thu, Mar 19, 2020 at 12:19:23PM +0000, Lad Prabhakar wrote:
> > Convert ov5645 bindings to json-schema.
>
> \o/
>
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > .../devicetree/bindings/media/i2c/ov5645.txt | 54 -------
> > .../devicetree/bindings/media/i2c/ov5645.yaml | 140 ++++++++++++++++++
> > 2 files changed, 140 insertions(+), 54 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > deleted file mode 100644
> > index 1c85c78ec58c..000000000000
> > --- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > +++ /dev/null
> > @@ -1,54 +0,0 @@
> > -* Omnivision 1/4-Inch 5Mp CMOS Digital Image Sensor
> > -
> > -The Omnivision OV5645 is a 1/4-Inch CMOS active pixel digital image sensor with
> > -an active array size of 2592H x 1944V. It is programmable through a serial I2C
> > -interface.
> > -
> > -Required Properties:
> > -- compatible: Value should be "ovti,ov5645".
> > -- clocks: Reference to the xclk clock.
> > -- clock-names: Should be "xclk".
> > -- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
> > - to the hardware pin PWDNB which is physically active low.
> > -- reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
> > - the hardware pin RESETB.
> > -- vdddo-supply: Chip digital IO regulator.
> > -- vdda-supply: Chip analog regulator.
> > -- vddd-supply: Chip digital core regulator.
> > -
> > -The device node must contain one 'port' child node for its digital output
> > -video port, in accordance with the video interface bindings defined in
> > -Documentation/devicetree/bindings/media/video-interfaces.txt.
> > -
> > -Example:
> > -
> > - &i2c1 {
> > - ...
> > -
> > - ov5645: ov5645@3c {
> > - compatible = "ovti,ov5645";
> > - reg = <0x3c>;
> > -
> > - enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
> > - reset-gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
> > - pinctrl-names = "default";
> > - pinctrl-0 = <&camera_rear_default>;
> > -
> > - clocks = <&clks 200>;
> > - clock-names = "xclk";
> > - assigned-clocks = <&clks 200>;
> > - assigned-clock-rates = <24000000>;
> > -
> > - vdddo-supply = <&camera_dovdd_1v8>;
> > - vdda-supply = <&camera_avdd_2v8>;
> > - vddd-supply = <&camera_dvdd_1v2>;
> > -
> > - port {
> > - ov5645_ep: endpoint {
> > - clock-lanes = <1>;
> > - data-lanes = <0 2>;
> > - remote-endpoint = <&csi0_ep>;
> > - };
> > - };
> > - };
> > - };
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.yaml b/Documentation/devicetree/bindings/media/i2c/ov5645.yaml
> > new file mode 100644
> > index 000000000000..4bf58ad210c5
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/ov5645.yaml
> > @@ -0,0 +1,140 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/ov5645.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Omnivision 1/4-Inch 5Mp CMOS Digital Image Sensor
>
> s/Mp/MP/ ?
>
> > +
> > +maintainers:
> > + - Sakari Ailus <sakari.ailus@...ux.intel.com>
> > + - Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > +
> > +description: |-
> > + The Omnivision OV5645 is a 1/4-Inch CMOS active pixel digital image sensor with
> > + an active array size of 2592H x 1944V. It is programmable through a serial I2C
> > + interface.
> > +
> > +properties:
> > + compatible:
> > + const: ovti,ov5645
> > +
> > + reg:
> > + description: I2C device address
> > + maxItems: 1
> > +
> > + clocks:
> > + maxItems: 1
> > +
> > + clock-names:
> > + items:
> > + - const: xclk
> > +
> > + assigned-clocks:
> > + maxItems: 1
> > +
> > + assigned-clock-rates:
> > + items:
> > + - description: Must be 24MHz (24000000).
>
> These two properties shouldn't be part of the bindings, they're generic.
The fact that they have 1 entry is part of this binding.
> > + enable-gpios:
> > + description: |-
> > + Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
> > + to the hardware pin PWDNB which is physically active low.
>
> Specifying that the polarity is GPIO_ACTIVE_HIGH is confusing in my
> opinion. If there's an inverter on the board, you'll need
> GPIO_ACTIVE_LOW. We could possibly drop the sentence, as all GPIOs in DT
> are supposed to be active high, but the fact that the GPIO name
> corresponds to the opposite of the pin probably has to be documented. I
> have no better wording to propose now I'm afraid, but it needs to be
> addressed. Maybe Rob or Maxime could help.
All GPIOs in DT are active high? What?
Using 'powerdown-gpios' would have made more sense here, but we're stuck
with it now. In any case, the description was good enough before and I
don't care to re-review it as part of the conversion.
> > + reset-gpios:
> > + description: |-
> > + Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
> > + the hardware pin RESETB.
>
> Here you could just drop the second sentence, or apply the same fix as
> for enable-gpios.
A description that's specific to this chip seems good to me.
> > +
> > + vdddo-supply:
> > + description:
> > + Chip digital IO regulator.
>
> You can move the description on the same line as the "description:" key.
> Same below.
>
> > +
> > + vdda-supply:
> > + description:
> > + Chip analog regulator.
> > +
> > + vddd-supply:
> > + description:
> > + Chip digital core regulator.
> > +
> > + # See ../video-interfaces.txt for more details
> > + port:
> > + type: object
> > + properties:
> > + endpoint:
> > + type: object
> > +
> > + properties:
> > + data-lanes:
> > + description: |-
> > + The sensor supports two-lane operation.
> > + For two-lane operation the property must be set to <1 2>.
> > + items:
> > + - const: 1
> > + - const: 2
>
>
> What if only one lane is wired, does the sensor support that ?
>
> > +
> > + clock-lanes:
> > + description:
> > + should be set to <0> (clock lane on hardware lane 0).
> > + items:
> > + - const: 0
> > +
> > + remote-endpoint: true
> > +
> > + required:
> > + - data-lanes
> > + - clock-lanes
> > + - remote-endpoint
> > +
> > + additionalProperties: false
> > +
> > + additionalProperties: false
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - clocks
> > + - clock-names
> > + - assigned-clocks
> > + - assigned-clock-rates
>
> Those two properties should be dropped.
>
> > + - enable-gpios
> > + - reset-gpios
>
> Are the GPIOs mandatory ? What if the signals are hardwired on the board
> ?
>
> > + - vdddo-supply
> > + - vdda-supply
> > + - vddd-supply
> > + - port
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + i2c1 {
>
> s/i2c1/i2c/
>
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + ov5645: sensor@3c {
> > + compatible = "ovti,ov5645";
> > + reg = <0x3c>;
> > + clocks = <&ov5645_cl>;
> > + clock-names = "xclk";
> > + assigned-clocks = <&ov5645_cl>;
> > + assigned-clock-rates = <24000000>;
> > + enable-gpios = <&gpio1 6 /* GPIO_ACTIVE_HIGH */>;
> > + reset-gpios = <&gpio5 20 /* GPIO_ACTIVE_LOW */>;
> > + vdddo-supply = <&camera_dovdd_1v8>;
> > + vdda-supply = <&camera_avdd_2v8>;
> > + vddd-supply = <&camera_dvdd_1v2>;
> > +
> > + port {
> > + ov5645_0: endpoint {
> > + remote-endpoint = <&csi1_ep>;
> > + clock-lanes = <0>;
> > + data-lanes = <1 2>;
> > + };
> > + };
> > + };
> > + };
> > +
> > +...
>
> --
> Regards,
>
> Laurent Pinchart
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