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Date: Fri, 22 May 2020 11:23:46 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Arnd Bergmann <arnd@...db.de>, Jon Mason <jdmason@...zu.us>,
Dave Jiang <dave.jiang@...el.com>,
Allen Hubbe <allenbh@...il.com>,
Tom Joseph <tjoseph@...ence.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh+dt@...nel.org>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jonathan Corbet <corbet@....net>, <linux-pci@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-ntb@...glegroups.com>
Subject: Re: [PATCH 01/19] dt-bindings: PCI: Endpoint: Add DT bindings for PCI
EPF NTB Device
Hi RobH,
On 5/14/2020 8:29 PM, Kishon Vijay Abraham I wrote:
> Add device tree schema for PCI endpoint function bus to which
> endpoint function devices should be attached. Then add device tree
> schema for PCI endpoint function device to include bindings thats
> generic to all endpoint functions. Finally add device tree schema
> for PCI endpoint NTB function device by including the generic
> device tree schema for PCIe endpoint function.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
> .../bindings/pci/endpoint/pci-epf-bus.yaml | 42 +++++++++++
> .../bindings/pci/endpoint/pci-epf-device.yaml | 69 +++++++++++++++++++
> .../bindings/pci/endpoint/pci-epf-ntb.yaml | 68 ++++++++++++++++++
> 3 files changed, 179 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/endpoint/pci-epf-bus.yaml
> create mode 100644 Documentation/devicetree/bindings/pci/endpoint/pci-epf-device.yaml
> create mode 100644 Documentation/devicetree/bindings/pci/endpoint/pci-epf-ntb.yaml
>
> diff --git a/Documentation/devicetree/bindings/pci/endpoint/pci-epf-bus.yaml b/Documentation/devicetree/bindings/pci/endpoint/pci-epf-bus.yaml
> new file mode 100644
> index 000000000000..1c504f2e85e4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/endpoint/pci-epf-bus.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/endpoint/pci-epf-bus.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: PCI Endpoint Function Bus
> +
> +maintainers:
> + - Kishon Vijay Abraham I <kishon@...com>
> +
> +properties:
> + compatible:
> + const: pci-epf-bus
> +
> +patternProperties:
> + "^func@[0-9a-f]+$":
> + type: object
> + description: |
> + PCI Endpoint Function Bus node should have subnodes for each of
> + the implemented endpoint function. It should follow the bindings
> + specified for endpoint function in
> + Documentation/devicetree/bindings/pci/endpoint/
> +
> +examples:
> + - |
> + epf_bus {
> + compatible = "pci-epf-bus";
> +
> + func@0 {
> + compatible = "pci-epf-ntb";
> + epcs = <&pcie0_ep>, <&pcie1_ep>;
> + epc-names = "primary", "secondary";
> + reg = <0>;
I'm not sure how to represent "reg" property properly for cases like this where
it represents ID and not a memory resource. I seem to get warning for
"reg_format" even after adding address-cells and size-cells property in
epf_bus. Can you give some hints here please?
> + epf,vendor-id = /bits/ 16 <0x104c>;
I want to make vendor-id and device-id as 16 bits from the beginning at-least
for PCIe endpoint. So I'm prefixing these properties with "epf,". However I get
this "do not match any of the regexes:". Can we add "epf" as a standard prefix?
Thanks
Kishon
> + epf,device-id = /bits/ 16 <0xb00d>;
> + num-mws = <4>;
> + mws-size = <0x0 0x100000>, <0x0 0x100000>, <0x0 0x100000>, <0x0 0x100000>;
> + };
> + };
> +...
> diff --git a/Documentation/devicetree/bindings/pci/endpoint/pci-epf-device.yaml b/Documentation/devicetree/bindings/pci/endpoint/pci-epf-device.yaml
> new file mode 100644
> index 000000000000..cee72864c8ca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/endpoint/pci-epf-device.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/endpoint/pci-epf-device.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: PCI Endpoint Function Device
> +
> +maintainers:
> + - Kishon Vijay Abraham I <kishon@...com>
> +
> +properties:
> + compatible:
> + const: pci-epf-bus
> +
> +properties:
> + $nodename:
> + pattern: "^func@"
> +
> + epcs:
> + description:
> + Phandle to the endpoint controller device. Should have "2" entries for
> + NTB endpoint function and "1" entry for others.
> + minItems: 1
> + maxItems: 2
> +
> + epc-names:
> + description:
> + Must contain an entry for each entry in "epcs" when "epcs" have more than
> + one entry.
> +
> + reg:
> + maxItems: 0
> + description: Must contain the index number of the function.
> +
> + epf,vendor-id:
> + description:
> + The PCI vendor ID
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint16
> +
> + epf,device-id:
> + description:
> + The PCI device ID
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint16
> +
> + epf,baseclass-code:
> + description: Code to classify the type of operation the function performs
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint8
> +
> + epf,subclass-code:
> + description:
> + Specifies a base class sub-class, which identifies more specifically the
> + operation of the Function
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint8
> +
> + epf,subsys-vendor-id:
> + description: Code to identify vendor of the add-in card or subsystem
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint16
> +
> + epf,subsys-id:
> + description: Code to specify an id that is specific to a vendor
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint16
> diff --git a/Documentation/devicetree/bindings/pci/endpoint/pci-epf-ntb.yaml b/Documentation/devicetree/bindings/pci/endpoint/pci-epf-ntb.yaml
> new file mode 100644
> index 000000000000..92c2e522b9e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/endpoint/pci-epf-ntb.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/endpoint/pci-epf-ntb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: PCI Endpoint NTB Function Device
> +
> +maintainers:
> + - Kishon Vijay Abraham I <kishon@...com>
> +
> +allOf:
> + - $ref: "pci-epf-device.yaml#"
> +
> +properties:
> + compatible:
> + const: pci-epf-ntb
> +
> + epcs:
> + minItems: 2
> + maxItems: 2
> +
> + epc-names:
> + items:
> + - const: primary
> + - const: secondary
> +
> + num-mws:
> + description:
> + Specify the number of memory windows
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint8
> + minimum: 1
> + maximum: 4
> +
> + mws-size:
> + description:
> + List of 'num-mws' entries containing size of each memory window.
> + minItems: 1
> + maxItems: 4
> +
> +required:
> + - compatible
> + - epcs
> + - epc-names
> + - epf,vendor-id
> + - epf,device-id
> + - num-mws
> + - mws-size
> +
> +examples:
> + - |
> + epf_bus {
> + compatible = "pci-epf-bus";
> +
> + func@0 {
> + compatible = "pci-epf-ntb";
> + reg = <0>;
> + epcs = <&pcie0_ep>, <&pcie1_ep>;
> + epc-names = "primary", "secondary";
> + epf,vendor-id = /bits/ 16 <0x104c>;
> + epf,device-id = /bits/ 16 <0xb00d>;
> + num-mws = <4>;
> + mws-size = <0x0 0x100000>, <0x0 0x100000>, <0x0 0x100000>, <0x0 0x100000>;
> + };
> + };
> +...
>
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