linux-kernel - Re: [PATCH V1 RESEND 2/4] Documentation: devicetree: bindings: add binding for PCIe endpoint bus

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Message-ID: <e4c058e9-6549-4ce2-be05-d09d5b1a9fc9@redhat.com>
Date:   Sun, 6 Mar 2022 07:37:46 -0800
From:   Tom Rix <trix@...hat.com>
To:     Lizhi Hou <lizhi.hou@...inx.com>, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, robh@...nel.org
Cc:     yilun.xu@...el.com, maxz@...inx.com, sonal.santan@...inx.com,
        yliu@...inx.com, michal.simek@...inx.com, stefanos@...inx.com,
        mdf@...nel.org, dwmw2@...radead.org, linux-kernel@...r.kernel.org,
        Max Zhen <max.zhen@...inx.com>
Subject: Re: [PATCH V1 RESEND 2/4] Documentation: devicetree: bindings: add
 binding for PCIe endpoint bus

Lizhi,

Sorry for the delay, I am fighting with checking this with 'make 
dt_binding_check'

There is a recent failure in linux-next around display/mediatek,* 
between next-20220301 and next-20220302 that I am bisecting.

There are a couple of checkpatch --strict warnings for this set, the 
obvious one is adding to the MAINTAINERS for new files.

Tom

On 3/4/22 9:23 PM, Lizhi Hou wrote:
> Create device tree binding document for PCIe endpoint bus.
>
> Signed-off-by: Sonal Santan <sonal.santan@...inx.com>
> Signed-off-by: Max Zhen <max.zhen@...inx.com>
> Signed-off-by: Lizhi Hou <lizhi.hou@...inx.com>
> ---
>   .../devicetree/bindings/bus/pci-ep-bus.yaml   | 72 +++++++++++++++++++
>   1 file changed, 72 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/bus/pci-ep-bus.yaml
>
> diff --git a/Documentation/devicetree/bindings/bus/pci-ep-bus.yaml b/Documentation/devicetree/bindings/bus/pci-ep-bus.yaml
> new file mode 100644
> index 000000000000..0ca96298db6f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/pci-ep-bus.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bus/pci-ep-bus.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: PCIe Endpoint Bus binding
> +
> +description: |
> +  PCIe device may use flattened device tree to describe apertures in its
> +  PCIe BARs. The Bus PCIe endpoint node is created and attached under the
> +  device tree root node for this kind of device. Then the flatten device
> +  tree overlay for this device is attached under the endpoint node.
> +
> +  The aperture address which is under the endpoint node consists of BAR
> +  index and offset. It uses the following encoding:
> +
> +    0xIooooooo 0xoooooooo
> +
> +  Where:
> +
> +    I = BAR index
> +    oooooo oooooooo = BAR offset
> +
> +  The endpoint is compatible with 'simple-bus' and contains 'ranges'
> +  property for translating aperture address to CPU address.
> +
> +allOf:
> +  - $ref: /schemas/simple-bus.yaml#
> +
> +maintainers:
> +  - Lizhi Hou <lizhi.hou@...inx.com>
> +
> +properties:
> +  compatible:
> +    contains:
> +      const: pci-ep-bus
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 2
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^.*@[0-9a-f]+$":
> +    description: hardware apertures belong to this device.
> +    type: object
> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    bus {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        pci-ep-bus@...00000 {
> +            compatible = "pci-ep-bus", "simple-bus";
> +            #address-cells = <2>;
> +            #size-cells = <2>;
> +            ranges = <0x0 0x0 0x0 0xe0000000 0x0 0x2000000
> +                      0x20000000 0x0 0x0 0xe4200000 0x0 0x40000>;
> +        };
> +    };