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Date:   Sun, 15 Aug 2021 08:09:58 +0100
Message-ID: <87bl5z18vt.wl-maz@kernel.org>
From:   Marc Zyngier <maz@kernel.org>
To:     Alyssa Rosenzweig <alyssa@rosenzweig.io>
Cc:     linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        Rob Herring <robh+dt@kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Krzysztof =?UTF-8?B?V2lsY3p5xYRza2k=?= <kw@linux.com>,
        Stan Skowronek <stan@corellium.com>,
        Mark Kettenis <kettenis@openbsd.org>,
        Sven Peter <sven@svenpeter.dev>,
        Hector Martin <marcan@marcan.st>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 1/2] dt-bindings: PCI: Add Apple PCI controller
In-Reply-To: <20210815042525.36878-2-alyssa@rosenzweig.io>
References: <20210815042525.36878-1-alyssa@rosenzweig.io>
        <20210815042525.36878-2-alyssa@rosenzweig.io>
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Hi Alyssa,

On Sun, 15 Aug 2021 05:25:24 +0100,
Alyssa Rosenzweig <alyssa@rosenzweig.io> wrote:
> 
> Document the properties used by the Apple PCI controller. This is a
> fairly standard PCI controller, although it is not derived from any
> known non-Apple IP.
> 
> Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

I would rather you post something as an extension to Mark's work, for
multiple reasons:

- Mark's patch is still being discussed, and is the current
  reference (specially given that it is already in use in OpenBSD and
  u-boot).
  
- we cannot have multiple bindings. There can only be one, shared
  across implementations. Otherwise, you need a different kernel
  depending on whether you are booting from m1n1 or u-boot.

- what you have here is vastly inconsistent (you are describing the
  MSIs twice, using two different methods).

Thanks,

	M.

> ---
>  .../devicetree/bindings/pci/apple,pcie.yaml   | 153 ++++++++++++++++++
>  MAINTAINERS                                   |   6 +
>  2 files changed, 159 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/apple,pcie.yaml b/Documentation/devicetree/bindings/pci/apple,pcie.yaml
> new file mode 100644
> index 000000000000..4378f5a05804
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/apple,pcie.yaml
> @@ -0,0 +1,153 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/apple,pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple SoC PCIe Controller Device Tree Bindings
> +
> +maintainers:
> +  - Alyssa Rosenzweig <alyssa@rosenzweig.io>
> +
> +description: |+
> +  Apple SoC PCIe host controller.
> +
> +allOf:
> + - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> +  compatible:
> +    const: apple,pcie
> +
> +  reg:
> +    items:
> +      - description: PCIe configuration region.
> +      - description: Core registers.
> +      - description: AXI bridge registers.
> +      - description: Port 0 (radio) registers.
> +      - description: Port 1 (USB) registers.
> +      - description: Port 2 (Ethernet) registers.
> +
> +  reg-names:
> +    items:
> +      - const: config
> +      - const: rc
> +      - const: phy
> +      - const: port0
> +      - const: port1
> +      - const: port2
> +
> +  interrupts:
> +    maxItems: 35
> +
> +  msi-controller:
> +    description: Identifies the node as an MSI controller.
> +
> +  msi-parent:
> +    description: MSI controller the device is capable of using.
> +
> +  reset-gpios:
> +    description: Reset lines for each of the ports of the controller.
> +
> +  pinctrl-0:
> +    description: Pin controller for the reset lines.
> +
> +  pinctrl-names:
> +    description: Names for the pin controller.
> +
> +required:
> +  - reg
> +  - reg-names
> +  - interrupt-parent
> +  - interrupts
> +  - msi-controller
> +  - msi-parent
> +  - msi-interrupts
> +  - iommu-map
> +  - iommu-map-mask
> +  - pinctrl-0
> +  - pinctrl-names
> +  - reset-gpios
> +  - bus-range
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - device_type
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/apple-aic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        pcie0: pcie@690000000 {
> +       	    compatible = "apple,pcie";
> +       	    reg = <0x6 0x90000000 0x0 0x1000000>,
> +       	          <0x6 0x80000000 0x0 0x100000>,
> +       	          <0x6 0x8c000000 0x0 0x100000>,
> +       	          <0x6 0x81000000 0x0 0x4000>,
> +       	          <0x6 0x82000000 0x0 0x4000>,
> +       	          <0x6 0x83000000 0x0 0x4000>;
> +       	    reg-names = "config", "rc", "phy", "port0",
> +       	    	    "port1", "port2";
> +       	    interrupt-parent = <&aic>;
> +       	    interrupts = <AIC_IRQ 695 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 698 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 701 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 704 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 705 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 706 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 707 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 708 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 709 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 710 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 711 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 712 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 713 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 714 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 715 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 716 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 717 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 718 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 719 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 720 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 721 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 722 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 723 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 724 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 725 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 726 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 727 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 728 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 729 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 730 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 731 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 732 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 733 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 734 IRQ_TYPE_LEVEL_HIGH>,
> +       	    	     <AIC_IRQ 735 IRQ_TYPE_LEVEL_HIGH>;
> +       	    msi-controller;
> +       	    msi-parent = <&pcie0>;
> +       	    msi-interrupts = <704 32>;
> +       	    iommu-map = <0x100 &pcie0_dart_0 0 1>,
> +       	    	    <0x200 &pcie0_dart_1 0 1>,
> +       	    	    <0x300 &pcie0_dart_2 0 1>;
> +       	    iommu-map-mask = <0xff00>;
> +       	    pinctrl-0 = <&pcie_pins>;
> +       	    pinctrl-names = "default";
> +       	    reset-gpios = <&gpio 152 0   &gpio 153 0   &gpio 33 0>;
> +       	    bus-range = <0 15>;
> +       	    #address-cells = <3>;
> +       	    #size-cells = <2>;
> +       	    ranges = <0x43000000 0x6 0xa0000000 0x6 0xa0000000
> +       	    	  0x0 0x20000000>,
> +       	    	 <0x02000000 0x0 0xc0000000 0x6 0xc0000000
> +       	    	  0x0 0x40000000>;
> +       	    device_type = "pci";
> +        };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b63403793c81..d7d2e1d1e2f2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1269,6 +1269,12 @@ S:	Maintained
>  F:	Documentation/devicetree/bindings/iommu/apple,dart.yaml
>  F:	drivers/iommu/apple-dart.c
>  
> +APPLE PCIE CONTROLLER DRIVER
> +M:	Alyssa Rosenzweig <alyssa@rosenzweig.io>
> +L:	linux-pci@vger.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/pci/apple,pcie.yaml
> +
>  APPLE SMC DRIVER
>  M:	Henrik Rydberg <rydberg@bitmath.org>
>  L:	linux-hwmon@vger.kernel.org
> -- 
> 2.30.2
> 
> 

-- 
Without deviation from the norm, progress is not possible.