linux-kernel - Re: [PATCH V4 XRT Alveo Infrastructure 2/5] Documentation: devicetree: bindings: add binding for Alveo platform

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Date:   Sun, 9 Jan 2022 09:46:51 -0800
From:   Tom Rix <trix@...hat.com>
To:     Lizhi Hou <lizhi.hou@...inx.com>, linux-kernel@...r.kernel.org
Cc:     linux-fpga@...r.kernel.org, maxz@...inx.com,
        sonal.santan@...inx.com, yliu@...inx.com, michal.simek@...inx.com,
        stefanos@...inx.com, devicetree@...r.kernel.org, mdf@...nel.org,
        robh@...nel.org, dwmw2@...radead.org,
        Max Zhen <max.zhen@...inx.com>
Subject: Re: [PATCH V4 XRT Alveo Infrastructure 2/5] Documentation:
 devicetree: bindings: add binding for Alveo platform


On 1/5/22 2:50 PM, Lizhi Hou wrote:
> Create device tree binding document for partitions and pr isolation on
> Xilinx Alveo platform.
>
> 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>
> ---
>   .../bindings/fpga/xlnx,alveo-partition.yaml   | 76 +++++++++++++++++++
>   .../fpga/xlnx,alveo-pr-isolation.yaml         | 40 ++++++++++
>   2 files changed, 116 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/fpga/xlnx,alveo-partition.yaml
>   create mode 100644 Documentation/devicetree/bindings/fpga/xlnx,alveo-pr-isolation.yaml
>
> diff --git a/Documentation/devicetree/bindings/fpga/xlnx,alveo-partition.yaml b/Documentation/devicetree/bindings/fpga/xlnx,alveo-partition.yaml
> new file mode 100644
> index 000000000000..ee50cb51d08e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/xlnx,alveo-partition.yaml
> @@ -0,0 +1,76 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/fpga/xlnx,alveo-partition.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx Alveo platform partition bindings
> +
> +description: |
> +  Xilinx Alveo platform is a PCI device and has one or more partitions. A
PCIe
> +  partition is programmed dynamically and contains a set of hardware
> +  peripherals also referred to as endpoints which appear on the PCI BARs.
> +  This binding is defined for endpoint address translation which uses the
> +  the following encoding:
> +
> +    0xIooooooo 0xoooooooo
> +
> +  Where:
> +
> +    I = BAR index
> +    oooooo oooooooo = BAR offset
> +
> +  As a PCI device, the Alveo platform is enumerated at runtime. Thus,
> +  the partition node is created by Alveo device driver. The device driver
> +  gets the BAR base address of the PCI device and creates the 'range'
> +  property for address translation.
> +
> +allOf:
> +  - $ref: /schemas/simple-bus.yaml#
> +
> +maintainers:
> +  - Lizhi Hou <lizhi.hou@...inx.com>
> +
> +properties:
> +  compatible:
> +    contains:
> +      const: xlnx,alveo-partition
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 2
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^.*@[0-9a-f]+$":
> +    description: hardware endpoints belong to this partition.
> +    type: object
> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    bus {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        xrt-part-bus@0 {
> +            compatible = "xlnx,alveo-partition", "simple-bus";
> +            #address-cells = <2>;
> +            #size-cells = <2>;
> +            ranges = <0x0 0x0 0x0 0xe0000000 0x0 0x2000000
> +                      0x20000000 0x0 0x0 0xe4200000 0x0 0x40000>;
> +            pr-isolate-ulp@...00 {
> +                compatible = "xlnx,alveo-pr-isolation";
> +                reg = <0x0 0x41000 0 0x1000>;
> +            };
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/fpga/xlnx,alveo-pr-isolation.yaml b/Documentation/devicetree/bindings/fpga/xlnx,alveo-pr-isolation.yaml
> new file mode 100644
> index 000000000000..8db949093ee0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/xlnx,alveo-pr-isolation.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/fpga/xlnx,alveo-pr-isolation.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx Partial Reconfig Isolation for Alveo platforms
Expand 'Partial Reconfig' to 'Partial Reconfiguration'
> +
> +description: |
> +  The Partial Reconfig ensures glitch free operation of the inputs from
> +  a reconfigurable partition during partial reconfiguration on Alveo
> +  platform.

glitch free is not descriptive. maybe describe what that reg is used for.

Tom

> +
> +maintainers:
> +  - Lizhi Hou <lizhi.hou@...inx.com>
> +
> +properties:
> +  compatible:
> +    const: xlnx,alveo-pr-isolation
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    bus {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        pr-isolation-ulp@...00 {
> +            compatible = "xlnx,alveo-pr-isolation";
> +            reg = <0 0x41000 0 0x1000>;
> +        };
> +    };