Message-ID: <1a371977-1fb5-4f3d-b4bf-7fb08c9c577f@oss.qualcomm.com>
Date: Tue, 6 Jan 2026 10:02:46 -0800
From: Vijay Kumar Tumati <vijay.tumati@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Hangxiang Ma <hangxiang.ma@....qualcomm.com>
Cc: 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>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        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,
        jeyaprakash.soundrapandian@....qualcomm.com
Subject: Re: [PATCH 2/7] media: dt-bindings: Add CAMSS device for SM8750


On 11/27/2025 12:10 AM, Krzysztof Kozlowski wrote:
> On Wed, Nov 26, 2025 at 01:38:35AM -0800, Hangxiang Ma wrote:
>> Add the compatible string "qcom,sm8750-camss" to support the Camera
> s/to support the/for the/
>
> Bindings do not support hardware.
Ack
>
>> Subsystem (CAMSS) on the Qualcomm SM8750 platform.
>>
>> The SM8750 platform provides:
>> - 3 x VFE, 5 RDI per VFE
>> - 2 x VFE Lite, 4 RDI per VFE Lite
>> - 3 x CSID
>> - 2 x CSID Lite
>> - 6 x CSIPHY
>> - 2 x ICP
>> - 1 x IPE
>> - 2 x JPEG DMA & Downscaler
>> - 2 x JPEG Encoder
>> - 1 x OFE
>> - 5 x RT CDM
>> - 3 x TPG
>>
>> Signed-off-by: Hangxiang Ma <hangxiang.ma@....qualcomm.com>
>> ---
>>   .../bindings/media/qcom,sm8750-camss.yaml          | 664 +++++++++++++++++++++
>>   1 file changed, 664 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/media/qcom,sm8750-camss.yaml b/Documentation/devicetree/bindings/media/qcom,sm8750-camss.yaml
>> new file mode 100644
>> index 000000000000..6b2b0b5a7e19
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/qcom,sm8750-camss.yaml
>> @@ -0,0 +1,664 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/media/qcom,sm8750-camss.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm SM8750 Camera Subsystem (CAMSS)
>> +
>> +maintainers:
>> +  - Hangxiang Ma <hangxiang.ma@....qualcomm.com>
>> +
>> +description:
>> +  This binding describes the camera subsystem hardware found on SM8750 Qualcomm
> s/This binding ..../SM8750 CAMSS (Camera Subsystem) is foo bar..../
>
> or any other form which will describe the hardware. There is no point to
> say that binding describes hardware. It cannot describe anything else.
Ack
>
>> +  SoCs. It includes submodules such as CSIPHY (CSI Physical layer) and CSID
>> +  (CSI Decoder), which comply with the MIPI CSI2 protocol.
>> +
>> +  The subsystem also integrates a set of real-time image processing engines and
>> +  their associated configuration modules, as well as non-real-time engines.
>> +
>> +  Additionally, it encompasses a test pattern generator (TPG) submodule.
>> +
>> +properties:
>> +  compatible:
>> +    const: qcom,sm8750-camss
>> +
>> +  reg:
>> +    items:
>> +      - description: Registers for CSID 0
>> +      - description: Registers for CSID 1
>> +      - description: Registers for CSID 2
>> +      - description: Registers for CSID Lite 0
>> +      - description: Registers for CSID Lite 1
>> +      - description: Registers for CSIPHY 0
>> +      - description: Registers for CSIPHY 1
>> +      - description: Registers for CSIPHY 2
>> +      - description: Registers for CSIPHY 3
>> +      - description: Registers for CSIPHY 4
>> +      - description: Registers for CSIPHY 5
>> +      - description: Registers for VFE (Video Front End) 0
>> +      - description: Registers for VFE 1
>> +      - description: Registers for VFE 2
>> +      - description: Registers for VFE Lite 0
>> +      - description: Registers for VFE Lite 1
>> +      - description: Registers for ICP (Imaging Control Processor) 0
>> +      - description: Registers for ICP SYS 0
>> +      - description: Registers for ICP 1
>> +      - description: Registers for ICP SYS 1
>> +      - description: Registers for IPE (Image Processing Engine)
>> +      - description: Registers for JPEG DMA & Downscaler 0
>> +      - description: Registers for JPEG Encoder 0
>> +      - description: Registers for JPEG DMA & Downscaler 1
>> +      - description: Registers for JPEG Encoder 1
>> +      - description: Registers for OFE (Offline Front End)
>> +      - description: Registers for RT CDM (Camera Data Mover) 0
>> +      - description: Registers for RT CDM 1
>> +      - description: Registers for RT CDM 2
>> +      - description: Registers for RT CDM 3
>> +      - description: Registers for RT CDM 4
>> +      - description: Registers for TPG 0
>> +      - description: Registers for TPG 1
>> +      - description: Registers for TPG 2
>> +
>> +  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
> I had impression there were talks and plans to split CSI PHY out of
> camss. Some other patches got blocked by this, so unfortunately this as
> well. Your cover letter does not answer on this, so unfortuntaly this
> concludes the review.
I believe we are not blocking the ongoing patches for this. I will let 
Bryan confirm this.
>
>> +      - const: vfe0
>> +      - const: vfe1
>> +      - const: vfe2
>> +      - const: vfe_lite0
>> +      - const: vfe_lite1
>> +      - const: icp0
>> +      - const: icp0_sys
>> +      - const: icp1
>> +      - const: icp1_sys
>> +      - const: ipe
>> +      - const: jpeg_dma0
>> +      - const: jpeg_enc0
>> +      - const: jpeg_dma1
>> +      - const: jpeg_enc1
>> +      - const: ofe
>> +      - const: rt_cdm0
>> +      - const: rt_cdm1
>> +      - const: rt_cdm2
>> +      - const: rt_cdm3
>> +      - const: rt_cdm4
>> +      - const: tpg0
>> +      - const: tpg1
>> +      - const: tpg2
>> +
>> +  clocks:
>> +    maxItems: 61
>> +
>> +  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
> cpas_ahb?
Ack
>
>> +      - const: cam_top_fast_ahb
> Isn't this cpas_fast_ahb? Why every schema comes with its own naming...
Ack. These were based on Kaanapali patches but we updated these there 
too. Will do the same here.
>> +      - 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
> Look at previous generation how this is called: gcc_axi_hf. Use that
> name.
Ack
>
>> +      - 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
>> +      - const: qdss_debug_xo
>> +      - const: camnoc_ipe_nps
>> +      - const: camnoc_ofe
>> +      - const: gcc_sf_axi
>> +      - const: icp0
>> +      - const: icp0_ahb
>> +      - const: icp1
>> +      - const: icp1_ahb
>> +      - const: ipe_nps
>> +      - const: ipe_nps_ahb
>> +      - const: ipe_nps_fast_ahb
>> +      - const: ipe_pps
>> +      - const: ipe_pps_fast_ahb
>> +      - const: jpeg0
>> +      - const: jpeg1
>> +      - const: ofe_ahb
>> +      - const: ofe_anchor
>> +      - const: ofe_anchor_fast_ahb
>> +      - const: ofe_hdr
>> +      - const: ofe_hdr_fast_ahb
>> +      - const: ofe_main
>> +      - const: ofe_main_fast_ahb
>> +      - const: vfe0_bayer
>> +      - const: vfe0_bayer_fast_ahb
>> +      - const: vfe1_bayer
>> +      - const: vfe1_bayer_fast_ahb
>> +      - const: vfe2_bayer
>> +      - const: vfe2_bayer_fast_ahb
>> +
>> +  interrupts:
>> +    maxItems: 32
>> +
>> +  interrupt-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
>> +      - const: camnoc_nrt
>> +      - const: camnoc_rt
>> +      - const: icp0
>> +      - const: icp1
>> +      - const: jpeg_dma0
>> +      - const: jpeg_enc0
>> +      - const: jpeg_dma1
>> +      - const: jpeg_enc1
>> +      - const: rt_cdm0
>> +      - const: rt_cdm1
>> +      - const: rt_cdm2
>> +      - const: rt_cdm3
>> +      - const: rt_cdm4
>> +      - const: tpg0
>> +      - const: tpg1
>> +      - const: tpg2
>> +
>> +  interconnects:
>> +    maxItems: 4
>> +
>> +  interconnect-names:
>> +    items:
>> +      - const: ahb
>> +      - const: hf_mnoc
>> +      - const: sf_icp_mnoc
>> +      - const: sf_mnoc
> Which previous generation you used as ordering style? X1E has it
> different.
The ordering is based on Kaanapali patches. Some names have been updated 
on the latest Kaanapali patches to be consistent with previous 
generations. and will update those here too.
>> +
>> +  iommus:
>> +    items:
>> +      - description: VFE non-protected stream
>> +      - description: ICP0 shared stream
>> +      - description: ICP1 shared stream
>> +      - description: IPE CDM non-protected stream
>> +      - description: IPE non-protected stream
>> +      - description: JPEG non-protected stream
>> +      - description: OFE CDM non-protected stream
>> +      - description: OFE non-protected stream
>> +      - description: VFE / VFE Lite CDM non-protected stream
>> +
>> +  power-domains:
>> +    items:
>> +      - description:
>> +          VFE0 GDSC - Global Distributed Switch Controller for VFE0.
>> +      - description:
>> +          VFE1 GDSC - Global Distributed Switch Controller for VFE1.
>> +      - description:
>> +          VFE2 GDSC - Global Distributed Switch Controller for VFE2.
>> +      - description:
>> +          Titan GDSC - Global Distributed Switch Controller for the entire camss.
>> +      - description:
>> +          IPE GDSC - Global Distributed Switch Controller for IPE.
>> +      - description:
>> +          OFE GDSC - Block Global Distributed Switch Controller for OFE.
>> +
>> +  power-domain-names:
>> +    items:
>> +      - const: vfe0
>> +      - const: vfe1
>> +      - const: vfe2
> Previous generations call these IFE, I already raised this and you
> changed to ife in Kaanapali. So are all future devices going to use
> rather VFE name?
Will change to 'ife'.
>
>> +      - const: top
>> +      - const: ipe
>> +      - const: ofe
>> +
>> +  vdd-csiphy0-0p88-supply:
> 88->8, so: vdd-csiphy0-0p8-supply:
>
> Same in other places. This is how it is called for every binding.
Ack
>> +    description:
>> +      Phandle to a 0.88V regulator supply to CSIPHY0 core block.
>> +
>> +  vdd-csiphy0-1p2-supply:
>> +    description:
>> +      Phandle to a 1.2V regulator supply to CSIPHY0 pll block.
>> +
>> +  vdd-csiphy1-0p88-supply:
>> +    description:
>> +      Phandle to a 0.88V regulator supply to CSIPHY1 core block.
> Best regards,
> Krzysztof
>

Powered by blists - more mailing lists