Message-ID: <c9f5dc86-3e48-44e3-8796-104e0434bbdc@oss.qualcomm.com>
Date: Thu, 23 Oct 2025 11:06:50 -0700
From: Vijay Kumar Tumati <vijay.tumati@....qualcomm.com>
To: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Hangxiang Ma <hangxiang.ma@....qualcomm.com>,
        Loic Poulain <loic.poulain@....qualcomm.com>,
        Robert Foss
 <rfoss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Todor Tomov <todor.too@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, aiqun.yu@....qualcomm.com,
        tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
        yijie.yang@....qualcomm.com,
        Jingyi Wang <jingyi.wang@....qualcomm.com>,
        Atiya Kailany <atiya.kailany@....qualcomm.com>
Subject: Re: [PATCH v2 2/6] dt-bindings: media: camss: Add
 qcom,kaanapali-camss binding


On 10/23/2025 4:13 AM, Vladimir Zapolskiy wrote:
> Hi Vijay.
>
> On 10/23/25 07:52, Vijay Kumar Tumati wrote:
>>
>> On 10/16/2025 5:27 PM, Vladimir Zapolskiy wrote:
>>> On 10/17/25 02:53, Vijay Kumar Tumati wrote:
>>>>
>>>> On 10/15/2025 12:45 PM, Vladimir Zapolskiy wrote:
>>>>> On 10/15/25 05:56, Hangxiang Ma wrote:
>>>>>> Add bindings for qcom,kaanapali-camss in order to support the camera
>>>>>> subsystem for Kaanapali.
>>>>>>
>>>>>> Signed-off-by: Hangxiang Ma <hangxiang.ma@....qualcomm.com>
>>>>>> ---
>>>>>>     .../bindings/media/qcom,kaanapali-camss.yaml       | 494
>>>>>> +++++++++++++++++++++
>>>>>>     1 file changed, 494 insertions(+)
>>>>>>
>>>>>> diff --git
>>>>>> a/Documentation/devicetree/bindings/media/qcom,kaanapali-camss.yaml
>>>>>> b/Documentation/devicetree/bindings/media/qcom,kaanapali-camss.yaml
>>>>>> new file mode 100644
>>>>>> index 000000000000..d04c21103cfd
>>>>>> --- /dev/null
>>>>>> +++
>>>>>> b/Documentation/devicetree/bindings/media/qcom,kaanapali-camss.yaml
>>>>>> @@ -0,0 +1,494 @@
>>>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>>>> +%YAML 1.2
>>>>>> +---
>>>>>> +$id: http://devicetree.org/schemas/media/qcom,kaanapali-camss.yaml#
>>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>>> +
>>>>>> +title: Qualcomm Kaanapali Camera Subsystem (CAMSS)
>>>>>> +
>>>>>> +maintainers:
>>>>>> +  - Hangxiang Ma <hangxiang.ma@....qualcomm.com>
>>>>>> +
>>>>>> +description:
>>>>>> +  The CAMSS IP is a CSI decoder and ISP present on Qualcomm
>>>>>> platforms.
>>>>>> +
>>>>>> +properties:
>>>>>> +  compatible:
>>>>>> +    const: qcom,kaanapali-camss
>>>>>> +
>>>>>> +  reg:
>>>>>> +    maxItems: 16
>>>>>> +
>>>>>> +  reg-names:
>>>>>> +    items:
>>>>>> +      - const: csid0
>>>>>> +      - const: csid1
>>>>>> +      - const: csid2
>>>>>> +      - const: csid_lite0
>>>>>> +      - const: csid_lite1
>>>>>> +      - const: csiphy0
>>>>>> +      - const: csiphy1
>>>>>> +      - const: csiphy2
>>>>>> +      - const: csiphy3
>>>>>> +      - const: csiphy4
>>>>>> +      - const: csiphy5
>>>>>> +      - const: vfe0
>>>>>> +      - const: vfe1
>>>>>> +      - const: vfe2
>>>>>> +      - const: vfe_lite0
>>>>>> +      - const: vfe_lite1
>>>>>> +
>>>>>> +  clocks:
>>>>>> +    maxItems: 34
>>>>>> +
>>>>>> +  clock-names:
>>>>>> +    items:
>>>>>> +      - const: camnoc_nrt_axi
>>>>>> +      - const: camnoc_rt_axi
>>>>>> +      - const: camnoc_rt_vfe0
>>>>>> +      - const: camnoc_rt_vfe1
>>>>>> +      - const: camnoc_rt_vfe2
>>>>>> +      - const: camnoc_rt_vfe_lite
>>>>>> +      - const: cam_top_ahb
>>>>>> +      - const: cam_top_fast_ahb
>>>>>> +      - const: csid
>>>>>> +      - const: csid_csiphy_rx
>>>>>> +      - const: csiphy0
>>>>>> +      - const: csiphy0_timer
>>>>>> +      - const: csiphy1
>>>>>> +      - const: csiphy1_timer
>>>>>> +      - const: csiphy2
>>>>>> +      - const: csiphy2_timer
>>>>>> +      - const: csiphy3
>>>>>> +      - const: csiphy3_timer
>>>>>> +      - const: csiphy4
>>>>>> +      - const: csiphy4_timer
>>>>>> +      - const: csiphy5
>>>>>> +      - const: csiphy5_timer
>>>>>> +      - const: gcc_hf_axi
>>>>>> +      - const: qdss_debug_xo
>>>>>> +      - const: vfe0
>>>>>> +      - const: vfe0_fast_ahb
>>>>>> +      - const: vfe1
>>>>>> +      - const: vfe1_fast_ahb
>>>>>> +      - const: vfe2
>>>>>> +      - const: vfe2_fast_ahb
>>>>>> +      - const: vfe_lite
>>>>>> +      - const: vfe_lite_ahb
>>>>>> +      - const: vfe_lite_cphy_rx
>>>>>> +      - const: vfe_lite_csid
>>>>>
>>>>> The list of 'clock-names' values is not alphanumerically sorted.
>>>>>
>>>>>> +
>>>>>> +  interrupts:
>>>>>> +    maxItems: 16
>>>>>> +  interrupt-names:
>>>>>
>>>>> Missing empty line to separate properties.
>>>>>
>>>>>> +    items:
>>>>>> +      - const: csid0
>>>>>> +      - const: csid1
>>>>>> +      - const: csid2
>>>>>> +      - const: csid_lite0
>>>>>> +      - const: csid_lite1
>>>>>> +      - const: csiphy0
>>>>>> +      - const: csiphy1
>>>>>> +      - const: csiphy2
>>>>>> +      - const: csiphy3
>>>>>> +      - const: csiphy4
>>>>>> +      - const: csiphy5
>>>>>> +      - const: vfe0
>>>>>> +      - const: vfe1
>>>>>> +      - const: vfe2
>>>>>> +      - const: vfe_lite0
>>>>>> +      - const: vfe_lite1
>>>>>> +
>>>>>> +  interconnects:
>>>>>> +    maxItems: 2
>>>>>> +
>>>>>> +  interconnect-names:
>>>>>> +    items:
>>>>>> +      - const: ahb
>>>>>> +      - const: hf_0_mnoc
>>>>>
>>>>> Please rename "hf_0_mnoc" to "hf_mnoc", see qcom,qcm2290-camss.yaml
>>>>> etc.
>>>>>
>>>>>> +
>>>>>> +  iommus:
>>>>>> +    maxItems: 1
>>>>>> +
>>>>>> +  power-domains:
>>>>>> +    items:
>>>>>> +      - description:
>>>>>> +          TFE0 GDSC - Thin Front End, Global Distributed Switch
>>>>>> Controller.
>>>>>> +      - description:
>>>>>> +          TFE1 GDSC - Thin Front End, Global Distributed Switch
>>>>>> Controller.
>>>>>> +      - description:
>>>>>> +          TFE2 GDSC - Thin Front End, Global Distributed Switch
>>>>>> Controller.
>>>>>> +      - description:
>>>>>> +          Titan GDSC - Titan ISP Block Global Distributed Switch
>>>>>> Controller.
>>>>>> +
>>>>>> +  power-domain-names:
>>>>>> +    items:
>>>>>> +      - const: tfe0
>>>>>> +      - const: tfe1
>>>>>> +      - const: tfe2
>>>>>
>>>>> Please remove all 'tfeX' power domains, they are not going to be
>>>>> utilized
>>>>> any time soon.
>>>>>
>>>>> When 'power-domains' list is just a single Titan GDSC,
>>>>> 'power-domain-names'
>>>>> property is not needed.
>>>>>
>>>>>> +      - const: top
>>>>>> +
>>>>>> +  vdda-pll-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 1.2V regulator supply to PHY refclk pll block.
>>>>>> +
>>>>>> +  vdda-phy0-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 0.8V regulator supply to PHY core block.
>>>>>> +
>>>>>> +  vdda-phy1-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 0.8V regulator supply to PHY core block.
>>>>>> +
>>>>>> +  vdda-phy2-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 0.8V regulator supply to PHY core block.
>>>>>> +
>>>>>> +  vdda-phy3-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 0.8V regulator supply to PHY core block.
>>>>>> +
>>>>>> +  vdda-phy4-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 0.8V regulator supply to PHY core block.
>>>>>> +
>>>>>> +  vdda-phy5-supply:
>>>>>> +    description:
>>>>>> +      Phandle to 0.8V regulator supply to PHY core block.
>>>>>
>>>>> What is the difference between vdda-phyX-supply properties, why do 
>>>>> you
>>>>> need so many of them, when their descriptions say they are all the
>>>>> same?
>>>> Each of these supply power to a specific CSIPHY and could be different
>>>> based on the board architecture. But I agree that the description 
>>>> should
>>>> probably capture that than just relying on the name.
>>>>>
>>>>>> +  ports:
>>>>>> +    $ref: /schemas/graph.yaml#/properties/ports
>>>>>> +
>>>>>> +    description:
>>>>>> +      CSI input ports.
>>>>>> +
>>>>>> +    properties:
>>>>>> +      port@0:
>>>>>
>>>>> Please use
>>>>>
>>>>>       patternProperties:
>>>>>         "^port@[0-3]$":
>>>>>
>>>>>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>>>>>> +        unevaluatedProperties: false
>>>>>> +        description:
>>>>>> +          Input port for receiving CSI data on CSI0.
>>>>>> +
>>>>>> +        properties:
>>>>>> +          endpoint:
>>>>>> +            $ref: video-interfaces.yaml#
>>>>>> +            unevaluatedProperties: false
>>>>>> +
>>>>>> +            properties:
>>>>>> +              clock-lanes:
>>>>>> +                maxItems: 1
>>>>>
>>>>> Please remove 'clock-lanes' property, it is non-configurable, 
>>>>> redundant
>>>>> and tends to store some irrelevant value.
>>>>>
>>>>>> +
>>>>>> +              data-lanes:
>>>>>> +                minItems: 1
>>>>>> +                maxItems: 4
>>>>>> +
>>>>>> +              bus-type:
>>>>>> +                enum:
>>>>>> +                  - 1  # MEDIA_BUS_TYPE_CSI2_CPHY
>>>>>> +                  - 4  # MEDIA_BUS_TYPE_CSI2_DPHY
>>>>>> +
>>>>>> +            required:
>>>>>> +              - clock-lanes
>>>>>
>>>>> The 'clock-lanes' property is expected to be removed.
>>>>>
>>>>>> +              - data-lanes
>>>>>> +
>>>>>> +      port@1:
>>>>>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>>>>>> +        unevaluatedProperties: false
>>>>>> +        description:
>>>>>> +          Input port for receiving CSI data on CSI1.
>>>>>> +
>>>>>> +        properties:
>>>>>> +          endpoint:
>>>>>> +            $ref: video-interfaces.yaml#
>>>>>> +            unevaluatedProperties: false
>>>>>> +
>>>>>> +            properties:
>>>>>> +              clock-lanes:
>>>>>> +                maxItems: 1
>>>>>> +
>>>>>> +              data-lanes:
>>>>>> +                minItems: 1
>>>>>> +                maxItems: 4
>>>>>> +
>>>>>> +              bus-type:
>>>>>> +                enum:
>>>>>> +                  - 1  # MEDIA_BUS_TYPE_CSI2_CPHY
>>>>>> +                  - 4  # MEDIA_BUS_TYPE_CSI2_DPHY
>>>>>> +
>>>>>> +            required:
>>>>>> +              - clock-lanes
>>>>>> +              - data-lanes
>>>>>> +
>>>>>> +      port@2:
>>>>>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>>>>>> +        unevaluatedProperties: false
>>>>>> +        description:
>>>>>> +          Input port for receiving CSI data on CSI2.
>>>>>> +
>>>>>> +        properties:
>>>>>> +          endpoint:
>>>>>> +            $ref: video-interfaces.yaml#
>>>>>> +            unevaluatedProperties: false
>>>>>> +
>>>>>> +            properties:
>>>>>> +              clock-lanes:
>>>>>> +                maxItems: 1
>>>>>> +
>>>>>> +              data-lanes:
>>>>>> +                minItems: 1
>>>>>> +                maxItems: 4
>>>>>> +
>>>>>> +              bus-type:
>>>>>> +                enum:
>>>>>> +                  - 1  # MEDIA_BUS_TYPE_CSI2_CPHY
>>>>>> +                  - 4  # MEDIA_BUS_TYPE_CSI2_DPHY
>>>>>> +
>>>>>> +            required:
>>>>>> +              - clock-lanes
>>>>>> +              - data-lanes
>>>>>> +
>>>>>> +      port@3:
>>>>>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>>>>>> +        unevaluatedProperties: false
>>>>>> +        description:
>>>>>> +          Input port for receiving CSI data on CSI3.
>>>>>> +
>>>>>> +        properties:
>>>>>> +          endpoint:
>>>>>> +            $ref: video-interfaces.yaml#
>>>>>> +            unevaluatedProperties: false
>>>>>> +
>>>>>> +            properties:
>>>>>> +              clock-lanes:
>>>>>> +                maxItems: 1
>>>>>> +
>>>>>> +              data-lanes:
>>>>>> +                minItems: 1
>>>>>> +                maxItems: 4
>>>>>> +
>>>>>> +              bus-type:
>>>>>> +                enum:
>>>>>> +                  - 1  # MEDIA_BUS_TYPE_CSI2_CPHY
>>>>>> +                  - 4  # MEDIA_BUS_TYPE_CSI2_DPHY
>>>>>> +
>>>>>> +            required:
>>>>>> +              - clock-lanes
>>>>>> +              - data-lanes
>>>>>> +
>>>>>> +required:
>>>>>> +  - compatible
>>>>>> +  - reg
>>>>>> +  - reg-names
>>>>>> +  - clocks
>>>>>> +  - clock-names
>>>>>> +  - interrupts
>>>>>> +  - interrupt-names
>>>>>> +  - interconnects
>>>>>> +  - interconnect-names
>>>>>> +  - iommus
>>>>>> +  - power-domains
>>>>>> +  - power-domain-names
>>>>>> +  - vdda-pll-supply
>>>>>> +  - vdda-phy0-supply
>>>>>> +  - vdda-phy1-supply
>>>>>> +  - vdda-phy2-supply
>>>>>> +  - vdda-phy3-supply
>>>>>> +  - vdda-phy4-supply
>>>>>> +  - vdda-phy5-supply
>>>>>
>>>>> Please exclude supplies from the list of required properties.
>>>> One of these supplies is required based which PHY the use case is 
>>>> being
>>>> run. Can you please advise how to handle that? Thanks.
>>>
>>> 1. Please rename all of them, reference to qcom,x1e80100-camss.yaml,
>>> qcom,qcm2290-camss.yaml or published on linux-media
>>> qcom,sm8650-camss.yaml
>>>
>>> 2. Remove all of them from the list of required properties, and in a
>>> board
>>> specific dts file add only the neccesary ones, that's it.
>>>
>> Thanks. We will try to follow the same for rev3. Just a caveat though.
>> If, for instance, two CSIPHYs have different 1.2 supplies and they are
>> required to be operated concurrently, it may be is a problem? as we can
>
> It should not be a problem, you can add two regulators, and it's fine,
> anyway all of them shall be optional properties, because it's unknown in
> advance which ones are actually needed.
>
>> put only one of those in the board specific DTS for the 1.2 supply node
>> (ex: vdd-csiphy-1p2 in SM2290). Is it not? However, if we don't have
>> such a use case requirement on the upstream may be it's OK. Thank you.
>
> Link to the published SM8650 CAMSS dt bindings, please follow this model:
> https://lore.kernel.org/linux-media/20251017031131.2232687-2-vladimir.zapolskiy@linaro.org/ 
>
>
> Please note the chosen naming scheme, when the supply property names
> follow the SoC pad namings one to one.
>
Thanks @Vladimir. Yes, this make sense if all of the reference and 
customer boards follow the internal power grid design. But agreed that 
this is all board specific. Please let us know your thoughts on the v3 
bindings for KNP. They mimic the existing 2290 and x1e80100 bindings. 
Thank you.

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