Re: [PATCH v2] dt-bindings: media: Add Omnivision ov8858 binding

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I just got your earlier email reply regarding the CC list, and I think
that clarifies (2) for me. Indeed, it seems like you were asking me to
also include the mailing lists. I didn't want to bother that many
people, but it seems like this is the procedure.

On Wed, Nov 9, 2022 at 9:48 AM Nicholas Roth <nicholas@xxxxxxxxxxxxx> wrote:
>
> Hello,
>
> I’m doing my best to follow along here. Your feedback didn’t get lost
> and I tried my best to follow it— I just must not have understood it
> correctly.
>
> > Where is the driver? If it was sent separately, you must resent entire
> > patchset.
> ...
> > 1. There is no driver, no DTS. You received the feedback about it.
>
> Driver: I submitted the .c files to linux-media, and as part of the
> review they asked for me to separately submit device tree bindings
> (https://patchwork.kernel.org/project/linux-media/patch/20221106171129.166892-2-nicholas@xxxxxxxxxxxxx/).
> Are you saying that the driver and the bindings should be the same
> commit after all? Are you saying that I need to change this into a
> series and include both linux-media@ and devicetree@ mailing lists in
> a v3 with both patches? Are you saying something else? I’m afraid I
> still don’t understand what you mean by this, but I want to, and I’m
> trying to.
>
> > 2. Wrong cc list. You were asked to use get_maintainers.pl and still
> > decide not to.
>
> I included the people from get_maintainers.pl, but it seems like you
> would like for me to include all entries, including the multiple
> mailing lists. Do I understand correctly?
>
> > Subject: drop redundant, second "binding".
> Is this new subject good, or would you prefer just "dt-bindings:
> media: Add Omnivision ov8858"? Just want to make sure I follow up.
>
> > How can you test bindings with libcamera?
> I validated the device tree + driver on this setup, though I did not
> know about the binding linter (and this one should pass). I am happy
> to drop the comment about validation though and just say this is
> tested with the binding checker, or say nothing at all if you'd like.
>
> > Filename matching the compatible.
> ...
> > Filename still does not match compatible. ovti,ov8858.yaml
> I didn't understand this the first time, but now I think I do-- seems
> like you're asking me to change the binding filename to
> "ovti,ov8858.yaml". I was trying to be consistent with ov8856.yaml,
> but happy to change the file name if that’s the convention. Is there a
> doc I can read with this information or is it institutional knowledge?
>
> > The frequency of clock should go via common clock framework - you have
> > get_rate and set_rate. Drop entire property.
> I am trying to be consistent with the ov8856 driver and bindings but
> would be happy to change if there's a different standard I should be
> following. I’m not familiar with that framework though. Is there
> somewhere I could read about this common clock framework, including
> the driver and device-tree changes I need in order to use it as
> compared to this or the ov8856 driver?
>
> > Which driver? In OpenBSD? Which version of OpenBSD? Drop the sentence.
> Seems like your point here and in the subsequent comments is to avoid
> implementation specifics. That makes a ton of sense, and I’ll make
> those changes for v3.
>
> All of your other comments make sense explicitly and I’ll make these
> changes. Please help me understand what you mean by (1) and (2),
> correct me where I’m wrong or misunderstanding you here, clarify where
> needed, and I’ll submit the v3.
>
> Thanks,
> -Nicholas
>
> On Wed, Nov 9, 2022 at 2:26 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@xxxxxxxxxx> wrote:
> >
> > On 09/11/2022 03:31, Nicholas Roth wrote:
> > > Add a device tree binding for the Omnivision OV8858 image sensor.
> > > The OV8858 is an 8 megapixel image sensor which provides images in RAW
> > > format over MIPI CSI-2 data bus and is controlled through an
> > > I2C-compatibile SCCB bus.
> > >
> > > Tested on PinePhone Pro with libcamera cam and qcam.
> >
> > How can you test bindings with libcamera?
> > >
> > > Signed-off-by: Nicholas Roth <nicholas@xxxxxxxxxxxxx>
> >
> > This is a friendly reminder during the review process.
> >
> > It seems my previous comments were not fully addressed. Maybe my
> > feedback got lost between the quotes, maybe you just forgot to apply it.
> > Please go back to the previous discussion and either implement all
> > requested changes or keep discussing them.
> >
> > Thank you.
> >
> > 1. There is no driver, no DTS. You received the feedback about it.
> > 2. Wrong cc list. You were asked to use get_maintainers.pl and still
> > decide not to.
> >
> > > ---
> > >  .../devicetree/bindings/media/i2c/ov8858.yaml | 139 ++++++++++++++++++
> > >  1 file changed, 139 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8858.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/media/i2c/ov8858.yaml b/Documentation/devicetree/bindings/media/i2c/ov8858.yaml
> > > new file mode 100644
> > > index 000000000000..f004e57b05ed
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/media/i2c/ov8858.yaml
> > > @@ -0,0 +1,139 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/media/i2c/ov8858.yaml#
> >
> > Filename still does not match compatible. ovti,ov8858.yaml
> >
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Omnivision OV8856 CMOS Sensor Device Tree Bindings
> > > +
> > > +maintainers:
> > > +  - Nicholas Roth <nicholas@xxxxxxxxxxxxx>
> > > +
> > > +description: |-
> > > +  The Omnivision OV8858 is an 8 megapixel image sensor which provides
> > > +  images in RAW format over MIPI CSI-2 data bus with up to 4 lanes
> > > +  and is controlled through an I2C-compatibile SCCB bus.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: ovti,ov8858
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  clocks:
> > > +    maxItems: 1
> > > +
> > > +  clock-names:
> > > +    description:
> > > +      Input clock for the sensor.
> > > +    items:
> > > +      - const: xvclk
> > > +
> > > +  clock-frequency:
> > > +    description:
> > > +      Frequency of the xvclk clock in Hertz.
> >
> > The frequency of clock should go via common clock framework - you have
> > get_rate and set_rate. Drop entire property.
> >
> > > +    minimum: 6000000
> > > +    default: 24000000
> > > +    maximum: 27000000
> > > +
> > > +  dovdd-supply:
> > > +    description:
> > > +      Definition of the regulator used as interface power supply.
> >
> > Drop "Definition of the regulator used as "
> >
> > > +
> > > +  avdd-supply:
> > > +    description:
> > > +      Definition of the regulator used as analog power supply.
> > > +
> > > +  dvdd-supply:
> > > +    description:
> > > +      Definition of the regulator used as digital power supply.
> > > +
> > > +  reset-gpios:
> > > +    description:
> > > +      The phandle and specifier for the GPIO that controls sensor reset.
> >
> > Drop this sentence.
> >
> > > +      This corresponds to the hardware pin XSHUTDN which is physically
> > > +      active low.
> > > +
> > > +  powerdown-gpios:
> > > +    description:
> > > +      The phandle and specifier for the GPIO that controls power down.
> >
> > Drop this sentence.
> >
> > > +      This corresponds to the hardware pin PWDNB which is physically
> > > +      active low.
> > > +
> > > +  port:
> > > +    $ref: /schemas/graph.yaml#/$defs/port-base
> > > +    additionalProperties: false
> > > +
> > > +    properties:
> > > +      endpoint:
> > > +        $ref: /schemas/media/video-interfaces.yaml#
> > > +        unevaluatedProperties: false
> > > +
> > > +        properties:
> > > +          data-lanes:
> > > +            description: |-
> > > +              The driver supports both two- and four-lane operation.
> >
> > Which driver? In OpenBSD? Which version of OpenBSD? Drop the sentence.
> >
> > > +            items:
> > > +              - const: 1
> > > +              - const: 2
> > > +              - const: 3
> > > +              - const: 4
> > > +
> > > +          link-frequencies:
> > > +            description: Frequencies listed are driver, not h/w limitations.
> >
> > If these are driver limitations, then drop it. Link frequencies are
> > hardware related and you should here describe the minimum and maximum.
> > Or leave it empty if any is allowed by hardware.
> >
> >
> > > +            maxItems: 1
> > > +            items:
> > > +              enum: [ 360000000 ]
> > > +
> > > +        required:
> > > +          - link-frequencies
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - clocks
> > > +  - clock-names
> > > +  - clock-frequency
> > > +  - dovdd-supply
> > > +  - avdd-supply
> > > +  - dvdd-supply
> > > +  - reset-gpios
> > > +  - port
> > > +
> > > +additionalProperties: false
> >
> > Best regards,
> > Krzysztof
> >




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