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Message-ID: <20220414100835.4c2efa3b@xps13>
Date: Thu, 14 Apr 2022 10:08:35 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Marek Vasut <marek.vasut+renesas@...il.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Magnus Damm <magnus.damm@...il.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Sergey Shtylyov <s.shtylyov@....ru>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Clement Leger <clement.leger@...tlin.com>
Subject: Re: [PATCH v2 2/8] dt-bindings: PCI: renesas-pci-usb: Convert
bindings to json-schema
Hi Hervé,
herve.codina@...tlin.com wrote on Thu, 14 Apr 2022 09:40:05 +0200:
> Convert Renesas PCI bridge bindings documentation to json-schema.
> Also name it 'renesas,pci-usb' as it is specifically used to
> connect the PCI USB controllers to AHB bus.
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> ---
> .../devicetree/bindings/pci/pci-rcar-gen2.txt | 84 -----------
> .../bindings/pci/renesas,pci-usb.yaml | 134 ++++++++++++++++++
> 2 files changed, 134 insertions(+), 84 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> create mode 100644 Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
>
> diff --git a/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt b/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> deleted file mode 100644
> index aeba38f0a387..000000000000
> --- a/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> +++ /dev/null
> @@ -1,84 +0,0 @@
> -Renesas AHB to PCI bridge
> --------------------------
> -
> -This is the bridge used internally to connect the USB controllers to the
> -AHB. There is one bridge instance per USB port connected to the internal
> -OHCI and EHCI controllers.
> -
> -Required properties:
> -- compatible: "renesas,pci-r8a7742" for the R8A7742 SoC;
> - "renesas,pci-r8a7743" for the R8A7743 SoC;
> - "renesas,pci-r8a7744" for the R8A7744 SoC;
> - "renesas,pci-r8a7745" for the R8A7745 SoC;
> - "renesas,pci-r8a7790" for the R8A7790 SoC;
> - "renesas,pci-r8a7791" for the R8A7791 SoC;
> - "renesas,pci-r8a7793" for the R8A7793 SoC;
> - "renesas,pci-r8a7794" for the R8A7794 SoC;
> - "renesas,pci-rcar-gen2" for a generic R-Car Gen2 or
> - RZ/G1 compatible device.
> -
> -
> - When compatible with the generic version, nodes must list the
> - SoC-specific version corresponding to the platform first
> - followed by the generic version.
> -
> -- reg: A list of physical regions to access the device: the first is
> - the operational registers for the OHCI/EHCI controllers and the
> - second is for the bridge configuration and control registers.
> -- interrupts: interrupt for the device.
> -- clocks: The reference to the device clock.
> -- bus-range: The PCI bus number range; as this is a single bus, the range
> - should be specified as the same value twice.
> -- #address-cells: must be 3.
> -- #size-cells: must be 2.
> -- #interrupt-cells: must be 1.
> -- interrupt-map: standard property used to define the mapping of the PCI
> - interrupts to the GIC interrupts.
> -- interrupt-map-mask: standard property that helps to define the interrupt
> - mapping.
> -
> -Optional properties:
> -- dma-ranges: a single range for the inbound memory region. If not supplied,
> - defaults to 1GiB at 0x40000000. Note there are hardware restrictions on the
> - allowed combinations of address and size.
> -
> -Example SoC configuration:
> -
> - pci0: pci@...90000 {
> - compatible = "renesas,pci-r8a7790", "renesas,pci-rcar-gen2";
> - clocks = <&mstp7_clks R8A7790_CLK_EHCI>;
> - reg = <0x0 0xee090000 0x0 0xc00>,
> - <0x0 0xee080000 0x0 0x1100>;
> - interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>;
> - status = "disabled";
> -
> - bus-range = <0 0>;
> - #address-cells = <3>;
> - #size-cells = <2>;
> - #interrupt-cells = <1>;
> - dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x40000000>;
> - interrupt-map-mask = <0xff00 0 0 0x7>;
> - interrupt-map = <0x0000 0 0 1 &gic 0 108 IRQ_TYPE_LEVEL_HIGH
> - 0x0800 0 0 1 &gic 0 108 IRQ_TYPE_LEVEL_HIGH
> - 0x1000 0 0 2 &gic 0 108 IRQ_TYPE_LEVEL_HIGH>;
> -
> - usb@1,0 {
> - reg = <0x800 0 0 0 0>;
> - phys = <&usb0 0>;
> - phy-names = "usb";
> - };
> -
> - usb@2,0 {
> - reg = <0x1000 0 0 0 0>;
> - phys = <&usb0 0>;
> - phy-names = "usb";
> - };
> - };
> -
> -Example board setup:
> -
> -&pci0 {
> - status = "okay";
> - pinctrl-0 = <&usb0_pins>;
> - pinctrl-names = "default";
> -};
> diff --git a/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml b/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> new file mode 100644
> index 000000000000..3f8d79b746c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> @@ -0,0 +1,134 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/renesas,pci-usb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas AHB to PCI bridge
> +
> +maintainers:
> + - Marek Vasut <marek.vasut+renesas@...il.com>
> + - Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> +
> +description: |
> + This is the bridge used internally to connect the USB controllers to the
> + AHB. There is one bridge instance per USB port connected to the internal
> + OHCI and EHCI controllers.
> +
> +allOf:
> + - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - enum:
> + - renesas,pci-r8a7742 # RZ/G1H
> + - renesas,pci-r8a7743 # RZ/G1M
> + - renesas,pci-r8a7744 # RZ/G1N
> + - renesas,pci-r8a7745 # RZ/G1E
> + - renesas,pci-r8a7790 # R-Car H2
> + - renesas,pci-r8a7791 # R-Car M2-W
> + - renesas,pci-r8a7793 # R-Car M2-N
> + - renesas,pci-r8a7794 # R-Car E2
> + - const: renesas,pci-rcar-gen2 # R-Car Gen2 and RZ/G1
> +
> + reg:
> + description: |
> + A list of physical regions to access the device. The first is
> + the operational registers for the OHCI/EHCI controllers and the
> + second is for the bridge configuration and control registers.
> + minItems: 2
> + maxItems: 2
> +
> + interrupts:
> + description: Interrupt for the device.
When the description is rather straightforward (like "this is the main
interrupt/clock") I don't think a description is expected. A number
however might be useful, I believe.
> +
> + interrupt-map:
> + description: |
> + Standard property used to define the mapping of the PCI interrupts
> + to the GIC interrupts.
> +
> + interrupt-map-mask:
> + description:
> + Standard property that helps to define the interrupt mapping.
> +
> + clocks:
> + description: The reference to the device clock.
Maybe maxItems: 1 ?
> +
> + bus-range:
> + description: |
> + The PCI bus number range; as this is a single bus, the range
> + should be specified as the same value twice.
> +
> + "#address-cells":
> + const: 3
> +
> + "#size-cells":
> + const: 2
> +
> + "#interrupt-cells":
> + const: 1
> +
> + dma-ranges:
> + description: |
> + A single range for the inbound memory region. If not supplied,
> + defaults to 1GiB at 0x40000000. Note there are hardware restrictions on
> + the allowed combinations of address and size.
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - interrupt-map
> + - interrupt-map-mask
> + - clocks
> + - bus-range
> + - "#address-cells"
> + - "#size-cells"
> + - "#interrupt-cells"
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/clock/r8a7790-cpg-mssr.h>
> +
> + bus {
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + pci0: pci@...90000 {
> + compatible = "renesas,pci-r8a7790", "renesas,pci-rcar-gen2";
> + device_type = "pci";
> + clocks = <&cpg CPG_MOD 703>;
> + reg = <0 0xee090000 0 0xc00>,
> + <0 0xee080000 0 0x1100>;
> + interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
> + status = "disabled";
> +
> + bus-range = <0 0>;
> + #address-cells = <3>;
> + #size-cells = <2>;
> + #interrupt-cells = <1>;
> + ranges = <0x02000000 0 0xee080000 0 0xee080000 0 0x00010000>;
> + dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x40000000>;
> + interrupt-map-mask = <0xf800 0 0 0x7>;
> + interrupt-map = <0x0000 0 0 1 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>,
> + <0x0800 0 0 1 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>,
> + <0x1000 0 0 2 &gic GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
> +
> + usb@1,0 {
> + reg = <0x800 0 0 0 0>;
> + phys = <&usb0 0>;
> + phy-names = "usb";
> + };
> +
> + usb@2,0 {
> + reg = <0x1000 0 0 0 0>;
> + phys = <&usb0 0>;
> + phy-names = "usb";
> + };
> + };
> + };
Thanks,
Miquèl
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