linux-kernel - Re: [PATCH v2 01/12] dt-bindings: PCI: Add Broadcom STB 7712 SOC, update maintainer

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Message-ID: <df291860-cbbe-4f94-a18d-00ae9cf905b1@kernel.org>
Date: Thu, 4 Jul 2024 08:40:41 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jim Quinlan <james.quinlan@...adcom.com>, linux-pci@...r.kernel.org,
 Nicolas Saenz Julienne <nsaenz@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
 Cyril Brulebois <kibi@...ian.org>, Stanimir Varbanov <svarbanov@...e.de>,
 bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
 <linux-rpi-kernel@...ts.infradead.org>,
 "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
 <linux-arm-kernel@...ts.infradead.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/12] dt-bindings: PCI: Add Broadcom STB 7712 SOC,
 update maintainer

On 03/07/2024 20:02, Jim Quinlan wrote:
> - Update maintainer; Nicolas hasn't been active and it
>   makes more sense to have a Broadcom maintainer
> - Add a driver compatible string for the new STB SOC 7712

You meant device? Bindings are for hardware.

> - Add two new resets for the 7712: "bridge", for the
>   the bridge between the PCIe core and the memory bus;
>   "swinit", the PCIe core reset.
> - Order the compatible strings alphabetically
> - Restructure the reset controllers so that the definitions
>   appear first before any rules that govern them.

Please split cleanups from new device support.

> 
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> ---
>  .../bindings/pci/brcm,stb-pcie.yaml           | 44 +++++++++++++++----
>  1 file changed, 36 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> index 11f8ea33240c..a070f35d28d7 100644
> --- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> @@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
>  title: Brcmstb PCIe Host Controller
>  
>  maintainers:
> -  - Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> +  - Jim Quinlan <james.quinlan@...adcom.com>
>  
>  properties:
>    compatible:
> @@ -16,11 +16,12 @@ properties:
>            - brcm,bcm2711-pcie # The Raspberry Pi 4
>            - brcm,bcm4908-pcie
>            - brcm,bcm7211-pcie # Broadcom STB version of RPi4
> -          - brcm,bcm7278-pcie # Broadcom 7278 Arm
>            - brcm,bcm7216-pcie # Broadcom 7216 Arm
> -          - brcm,bcm7445-pcie # Broadcom 7445 Arm
> +          - brcm,bcm7278-pcie # Broadcom 7278 Arm
>            - brcm,bcm7425-pcie # Broadcom 7425 MIPs
>            - brcm,bcm7435-pcie # Broadcom 7435 MIPs
> +          - brcm,bcm7445-pcie # Broadcom 7445 Arm
> +          - brcm,bcm7712-pcie # STB sibling SOC of Raspberry Pi 5
>  
>    reg:
>      maxItems: 1
> @@ -95,6 +96,20 @@ properties:
>        minItems: 1
>        maxItems: 3
>  
> +  resets:
> +    items:
> +      - description: reset for phy calibration
> +      - description: reset for PCIe/CPU bus bridge
> +      - description: reset for soft PCIe core reset
> +      - description: reset for PERST# PCIe signal

This won't work and I doubt you tested your code. You miss minItems.

> +
> +  reset-names:
> +    items:
> +      - const: rescal
> +      - const: bridge
> +      - const: swinit
> +      - const: perst

This does not match what you have in conditional, so just keep min and
max Items here.


> +
>  required:
>    - compatible
>    - reg
> @@ -118,13 +133,10 @@ allOf:
>      then:
>        properties:
>          resets:
> -          items:
> -            - description: reset controller handling the PERST# signal
> -
> +          minItems: 1

maxItems instead. Why three resets should be valid?


>          reset-names:
>            items:
>              - const: perst
> -
>        required:
>          - resets
>          - reset-names
> @@ -136,12 +148,28 @@ allOf:
>      then:
>        properties:
>          resets:
> +          minItems: 1
> +        reset-names:
>            items:
> -            - description: phandle pointing to the RESCAL reset controller
> +            - const: rescal
> +      required:
> +        - resets
> +        - reset-names

Why?

> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: brcm,bcm7712-pcie
> +    then:
> +      properties:
> +        resets:
> +          minItems: 3

Again, you do not have 4 items here.

>  
>          reset-names:
>            items:
>              - const: rescal
> +            - const: bridge
> +            - const: swinit
>  
>        required:
>          - resets

Best regards,
Krzysztof