linux-kernel - Re: [PATCH 2/6] dt-bindings: media: Add qcom,x1e80100-camss binding

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Message-ID: <bb58d02f-9ed6-476f-8bc6-ad56cb35e37f@linaro.org>
Date: Thu, 21 Nov 2024 01:02:18 +0200
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Loic Poulain <loic.poulain@...aro.org>, 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>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Jagadeesh Kona <quic_jkona@...cinc.com>,
 Konrad Dybcio <konradybcio@...nel.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, linux-clk@...r.kernel.org
Subject: Re: [PATCH 2/6] dt-bindings: media: Add qcom,x1e80100-camss binding

Hi Bryan,

On 11/19/24 17:11, Bryan O'Donoghue wrote:
> On 19/11/2024 14:34, Vladimir Zapolskiy wrote:
>> Hi Bryan,
>>
>> please find a few review comments below.
>>
>> On 11/19/24 15:10, Bryan O'Donoghue wrote:
>>> Add bindings for qcom,x1e80100-camss in order to support the camera
>>> subsystem for x1e80100 as found in various Co-Pilot laptops.
>>>
>>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>> ---
>>>    .../bindings/media/qcom,x1e80100-camss.yaml        | 354 +++++++++++
>>> ++++++++++
>>>    1 file changed, 354 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/media/qcom,x1e80100-
>>> camss.yaml b/Documentation/devicetree/bindings/media/qcom,x1e80100-
>>> camss.yaml
>>> new file mode 100644
>>> index
>>> 0000000000000000000000000000000000000000..ca2499cd52a51e14bad3cf8a8ca94c9d23ed5030
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/media/qcom,x1e80100-camss.yaml
>>> @@ -0,0 +1,354 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/media/qcom,x1e80100-camss.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Qualcomm X1E80100 Camera Subsystem (CAMSS)
>>> +
>>> +maintainers:
>>> +  - Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>> +
>>> +description: |
>>> +  The CAMSS IP is a CSI decoder and ISP present on Qualcomm platforms.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: qcom,x1e80100-camss
>>> +
>>> +  clocks:
>>> +    maxItems: 29
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: camnoc_rt_axi
>>> +      - const: camnoc_nrt_axi
>>> +      - const: core_ahb
>>> +      - const: cpas_ahb
>>> +      - const: cpas_fast_ahb
>>> +      - const: cpas_vfe0
>>> +      - const: cpas_vfe1
>>> +      - const: cpas_vfe_lite
>>> +      - const: cphy_rx_clk_src
>>> +      - const: csid
>>> +      - const: csid_csiphy_rx
>>> +      - const: csiphy0
>>> +      - const: csiphy0_timer
>>> +      - const: csiphy1
>>> +      - const: csiphy1_timer
>>> +      - const: csiphy2
>>> +      - const: csiphy2_timer
>>> +      - const: csiphy4
>>> +      - const: csiphy4_timer
>>
>> What does happen to csiphy3? Could it fall through the cracks?
>>
> 
> Nope.
> 
> For whatever reason csiphy4 is the name here. I guess different SKUs
> have been fused out this way. I'd assume there's some version that does
> csiphy0-csiphy4 inclusive.
> 
> Not here though.
> 
>>> +      - const: gcc_axi_hf
>>> +      - const: gcc_axi_sf
>>> +      - const: vfe0
>>> +      - const: vfe0_fast_ahb
>>> +      - const: vfe1
>>> +      - const: vfe1_fast_ahb
>>> +      - const: vfe_lite
>>> +      - const: vfe_lite_ahb
>>> +      - const: vfe_lite_cphy_rx
>>> +      - const: vfe_lite_csid
>>> +
>>> +  interrupts:
>>> +    maxItems: 13
>>> +
>>> +  interrupt-names:
>>> +    items:
>>> +      - const: csid0
>>> +      - const: csid1
>>> +      - const: csid2
>>> +      - const: csid_lite0
>>> +      - const: csid_lite1
>>> +      - const: csiphy0
>>> +      - const: csiphy1
>>> +      - const: csiphy2
>>> +      - const: csiphy4
>>> +      - const: vfe0
>>> +      - const: vfe1
>>> +      - const: vfe_lite0
>>> +      - const: vfe_lite1
>>> +
>>> +  iommus:
>>> +    maxItems: 13
>>> +
>>> +  interconnects:
>>> +    maxItems: 4
>>> +
>>> +  interconnect-names:
>>> +    items:
>>> +      - const: cam_ahb
>>> +      - const: cam_hf_mnoc
>>> +      - const: cam_sf_mnoc
>>> +      - const: cam_sf_icp_mnoc
>>> +
>>> +  power-domains:
>>> +    items:
>>> +      - description: IFE0 GDSC - Image Front End, Global Distributed
>>> Switch Controller.
>>> +      - description: IFE1 GDSC - Image Front End, Global Distributed
>>> Switch Controller.
>>> +      - description: Titan Top GDSC - Titan ISP Block, Global
>>> Distributed Switch Controller.
>>> +
>>> +  power-domain-names:
>>> +    items:
>>> +      - const: ife0
>>> +      - const: ife1
>>> +      - const: top
>>> +
>>> +  ports:
>>> +    $ref: /schemas/graph.yaml#/properties/ports
>>> +
>>> +    description:
>>> +      CSI input ports.
>>> +
>>> +    patternProperties:
>>> +      "^port@[03]+$":
>>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>>> +        unevaluatedProperties: false
>>> +
>>> +        description:
>>> +          Input port for receiving CSI data from a CSIPHY.
>>> +
>>> +        properties:
>>> +          endpoint:
>>> +            $ref: video-interfaces.yaml#
>>> +            unevaluatedProperties: false
>>> +
>>> +            properties:
>>> +              clock-lanes:
>>> +                maxItems: 1
>>> +
>>> +              data-lanes:
>>> +                minItems: 1
>>> +                maxItems: 4
>>> +
>>> +            required:
>>> +              - clock-lanes
>>> +              - data-lanes
>>> +
>>> +  reg:
>>> +    maxItems: 12
>>> +
>>> +  reg-names:
>>> +    items:
>>> +      - const: csid0
>>> +      - const: csid1
>>> +      - const: csid2
>>> +      - const: csid_wrapper
>>> +      - const: csiphy0
>>> +      - const: csiphy1
>>> +      - const: csiphy2
>>> +      - const: csiphy4
>>> +      - const: vfe_lite0
>>> +      - const: vfe_lite1
>>> +      - const: vfe0
>>> +      - const: vfe1
>>> +
>>> +  vdda-phy-supply:
>>> +    description:
>>> +      Phandle to a 0.9V regulator supply to PHY core block.
>>> +
>>> +  vdda-pll-supply:
>>> +    description:
>>> +      Phandle to 1.2V regulator supply to PHY refclk pll block.
>>
>> I believe it's very unlikely that the SoC pads are called like this,
>> as we discussed it in the recent past.
>>
>> Please rename the properties to reflect the names inherited from
>> the actual hardware.
> 
> I believe we agreed to convert to the PHY infrastructure after 8550,
> 7280 and x1e80100.
> 
> So these names should rename as is.

my ask is not related to the planned PHY conversion, it's much simpler and
easily doable, just reflect the proper pad names in the property names.

There is no such hardware objects on the SoC, which names can be associated
to "vdda-phy" or "vdda-pll" property names. Okay, split of CSIPHY specific
supplies can be done separately, but can you introduce here property names
like "vdd-csiphy-0p9-supply" and "vdd-csiphy-1p2-supply"?

Also you put a description like "supply to PHY refclk pll block", but if I
remember correctly once you've said that the datasheet (of another SoC)
does not give any clues about the usage of the supply, thus it invalidates
the given description.

I'm unhappy that people tend to copy defects, which are trivial to fix or
avoid at least.

--
Best wishes,
Vladimir