Re: [PATCH 2/7] dt-bindings: phy: qcom: Add qcom,sa8775p-csi2-phy schema

[Anusha Arun Nandi]

Hi Krzysztof,

Thank you for the comments. I have replied to Bryan's comment about a
single generic yaml file. Based on his comments, I will drop the next
version of this patchset with these comments addressed.

Best Regards,
Anusha

On 10/19/2026 12:16 AM, Krzysztof Kozlowski wrote:
> On Fri, Oct 16, 2026 at 04:54:57PM -0700, Anusha Arun Nandi wrote:
>> Add a device-tree binding for the Qualcomm SA8775P MIPI CSI2
>> PHY, modelled as a standalone generic-PHY provider like the existing
>> qcom,x1e80100-csi2-phy, so CAMSS can consume the CSIPHY through the
>> common PHY framework instead of driving it in-line.
> 
> A nit, subject: drop second/last, redundant "schema". The
> "dt-bindings" prefix is already stating that these are schemas.
> See also:
> https://elixir.bootlin.com/linux/v7.1-rc7/source/Documentation/devicetree/bindings/submitting-patches.rst#L23
> 
>>
>> Follows the qcom,x1e80100-csi2-phy schema's shape: a ports/port@0
>> sensor-input endpoint carrying data-lanes/bus-type (D-PHY only for
>> now, C-PHY bus-type value is accepted by the schema but wired up by a
>> companion series), a port@1 CSID output, and a mandatory
>> operating-points-v2 table plus power-domains/power-domain-names.
>>
>> Unlike x1e80100, SA8775P's CSIPHY has a single power-domain: the
>> Titan Top GDSC, matching the legacy in-tree CAMSS driver's
>> sa8775p_resources.pd_name = "top" (drivers/media/platform/qcom/camss/
>> camss.c) and the existing lemans.dtsi camss node's power-domains =
>> <&camcc CAM_CC_TITAN_TOP_GDSC>. It is not OPP-scaled, only kept
>> enabled, the same way x1e80100's own "top" domain is.
>>
>> The PHY takes three clocks (core, timer and the shared CSID CSIPHY RX
>> clock) and the vdda-phy/vdda-pll supplies. The core/timer naming
>> matches x1e80100's clock-names convention for the same pair of
>> clocks.
>>
>> Signed-off-by: Anusha Arun Nandi <anusha.nandi@xxxxxxxxxxxxxxxx>
>> ---
>>  .../bindings/phy/qcom,sa8775p-csi2-phy.yaml   | 172 ++++++++++++++++++
>>  1 file changed, 172 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,sa8775p-csi2-phy.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom,sa8775p-csi2-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sa8775p-csi2-phy.yaml
>> new file mode 100644
>> index 000000000000..b66ec2f14189
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/qcom,sa8775p-csi2-phy.yaml
>> @@ -0,0 +1,172 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +# Copyright (c) 2026 Qualcomm Innovation Center, Inc. All rights reserved.
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/qcom,sa8775p-csi2-phy.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm SA8775P CSI2 PHY
>> +
>> +maintainers:
>> +  - Anusha Arun Nandi <anusha.nandi@xxxxxxxxxxxxxxxx>
>> +
>> +description:
>> +  Qualcomm MIPI CSI2 D-PHY. Connects MIPI CSI2 sensors to Qualcomm's Camera
>> +  CSI Decoder on the SA8775P SoC.
>> +
>> +properties:
>> +  compatible:
>> +    const: qcom,sa8775p-csi2-phy
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 3
>> +
>> +  clock-names:
>> +    items:
>> +      - const: core
>> +      - const: timer
>> +      - const: csiphy_rx
> 
> You just named it basde on clock name. Instead, name it based on the
> input name. csiphy is also completely redundant.
> 
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  operating-points-v2: true
>> +
>> +  opp-table:
>> +    type: object
>> +
>> +  power-domains:
>> +    items:
>> +      - description: Titan Top GDSC - Titan ISP Block, Global Distributed Switch Controller.
>> +
>> +  power-domain-names:
>> +    items:
>> +      - const: top
>> +
>> +  vdda-phy-supply:
>> +    description: Phandle to PHY supply.
>> +
>> +  vdda-pll-supply:
>> +    description: Phandle to PLL supply.
>> +
>> +  ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
>> +
>> +    properties:
>> +      port@0:
>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>> +        description:
>> +          Sensor input. A single sensor is described by a single endpoint
>> +          with one to four data lanes, numbered 1-4. The clock lane is
>> +          position 0.
>> +
>> +        unevaluatedProperties: false
>> +
>> +        patternProperties:
>> +          "^endpoint(@0)?$":
> 
> so not a pattern really and just endpoint.
> 
>> +            $ref: /schemas/media/video-interfaces.yaml#
>> +            unevaluatedProperties: false
>> +            properties:
>> +              bus-type:
>> +                enum:
>> +                  - 1 # MEDIA_BUS_TYPE_CSI2_CPHY
>> +                  - 4 # MEDIA_BUS_TYPE_CSI2_DPHY
>> +                default: 4
>> +
>> +              data-lanes:
>> +                minItems: 1
>> +                maxItems: 4
>> +                items:
>> +                  minimum: 1
>> +                  maximum: 4
>> +                description:
>> +                  Data lane positions following this endpoint's clock
>> +                  lane. Positions are a per-port logical numbering, not
>> +                  package pad or ball positions.
>> +
>> +            required:
>> +              - data-lanes
>> +              - remote-endpoint
>> +
>> +      port@1:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: Output to the CAMSS CSID controller.
>> +
>> +    required:
>> +      - port@0
>> +      - port@1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +  - interrupts
>> +  - operating-points-v2
>> +  - power-domains
>> +  - power-domain-names
>> +  - vdda-phy-supply
>> +  - vdda-pll-supply
>> +  - ports
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/qcom,sa8775p-camcc.h>
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +    #include <dt-bindings/media/video-interfaces.h>
>> +
>> +    csiphy0: csiphy@ac9c000 {
> 
> Drop unused label
> 
> git grep csiphy@
> 
> Don't come with own style.
> 
> Best regards,
> Krzysztof