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Date: Mon, 1 Aug 2022 12:13:11 -0600
From: Rob Herring <robh@...nel.org>
To: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Jingoo Han <jingoohan1@...il.com>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Serge Semin <fancer.lancer@...il.com>,
Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
Krzysztof Wilczyński <kw@...ux.com>,
Frank Li <Frank.Li@....com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 12/17] dt-bindings: PCI: dwc: Add Baikal-T1 PCIe Root
Port bindings
On Thu, Jul 28, 2022 at 05:34:22PM +0300, Serge Semin wrote:
> Baikal-T1 SoC is equipped with DWC PCIe v4.60a Root Port controller, which
> link can be trained to work on up to Gen.3 speed over up to x4 lanes. The
> controller is supposed to be fed up with four clock sources: DBI
> peripheral clock, AXI application Tx/Rx clocks and external PHY/core
> reference clock generating the 100MHz signal. In addition to that the
> platform provide a way to reset each part of the controller:
> sticky/non-sticky bits, host controller core, PIPE interface, PCS/PHY and
> Hot/Power reset signal. The Root Port controller is equipped with multiple
> IRQ lines like MSI, system AER, PME, HP, Bandwidth change, Link
> equalization request and eDMA ones. The registers space is accessed over
> the DBI interface. There can be no more than four inbound or outbound iATU
> windows configured.
>
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
>
> ---
>
> Changelog v2:
> - Rename 'syscon' property to 'baikal,bt1-syscon'.
> - Fix the 'compatible' property definition to being more specific about
> what strings are supposed to be used. Due to that we had to add the
> select property to evaluate the schema against the Baikal-T1 PCIe DT
> nodes only.
> ---
> .../bindings/pci/baikal,bt1-pcie.yaml | 154 ++++++++++++++++++
> 1 file changed, 154 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml
>
> diff --git a/Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml b/Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml
> new file mode 100644
> index 000000000000..23bd1d0aa5c5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml
> @@ -0,0 +1,154 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/baikal,bt1-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Baikal-T1 PCIe Root Port Controller
> +
> +maintainers:
> + - Serge Semin <fancer.lancer@...il.com>
> +
> +description:
> + Embedded into Baikal-T1 SoC Root Complex controller. It's based on the
> + DWC RC PCIe v4.60a IP-core, which is configured to have just a single Root
> + Port function and is capable of establishing the link up to Gen.3 speed
> + on x4 lanes. It doesn't have embedded clock and reset control module, so
> + the proper interface initialization is supposed to be performed by software.
> +
> +select:
> + properties:
> + compatible:
> + contains:
> + const: baikal,bt1-pcie
> +
> + required:
> + - compatible
> +
> +allOf:
> + - $ref: /schemas/pci/snps,dw-pcie.yaml#
> +
> +properties:
> + compatible:
> + items:
> + - const: baikal,bt1-pcie
> + - const: snps,dw-pcie-4.60a
> + - const: snps,dw-pcie
Again, these fallbacks simply aren't useful.
> +
> + reg:
> + description:
> + DBI, DBI2 and at least 4KB outbound iATU-capable region.
'iATU-capable region' means config space? That's not very clear.
> + maxItems: 3
> +
> + reg-names:
> + minItems: 3
> + maxItems: 3
> + items:
> + enum: [ dbi, dbi2, config ]
Define the order. Here, and the rest.
> +
> + interrupts:
> + description:
> + MSI, AER, PME, Hot-plug, Link Bandwidth Management, Link Equalization
> + request and eight Read/Write eDMA IRQ lines are available.
> + maxItems: 14
> +
> + interrupt-names:
> + minItems: 14
> + maxItems: 14
> + items:
> + oneOf:
> + - pattern: '^dma[0-7]$'
> + - enum: [ msi, aer, pme, hp, bw_mg, l_eq ]
> +
> + clocks:
> + description:
> + DBI (attached to the APB bus), AXI-bus master and slave interfaces
> + are fed up by the dedicated application clocks. A common reference
> + clock signal is supposed to be attached to the corresponding Ref-pad
> + of the SoC. It will be redistributed amongst the controller core
> + sub-modules (pipe, core, aux, etc).
> + minItems: 4
> + maxItems: 4
> +
> + clock-names:
> + minItems: 4
> + maxItems: 4
> + items:
> + enum: [ dbi, mstr, slv, ref ]
> +
> + resets:
> + description:
> + A comprehensive controller reset logic is supposed to be implemented
> + by software, so almost all the possible application and core reset
> + signals are exposed via the system CCU module.
> + minItems: 9
> + maxItems: 9
> +
> + reset-names:
> + minItems: 9
> + maxItems: 9
> + items:
> + enum: [ mstr, slv, pwr, hot, phy, core, pipe, sticky, non-sticky ]
> +
> + baikal,bt1-syscon:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description:
> + Phandle to the Baikal-T1 System Controller DT node. It's required to
> + access some additional PM, Reset-related and LTSSM signals.
> +
> + num-lanes:
> + maximum: 4
> +
> + max-link-speed:
> + maximum: 3
> +
> + num-ob-windows:
> + const: 4
> +
> + num-ib-windows:
> + const: 4
These are deprecated. Don't add them for a new binding.
> +
> +required:
> + - compatible
> + - reg
> + - reg-names
> + - interrupts
> + - interrupt-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + pcie@...52000 {
> + compatible = "baikal,bt1-pcie", "snps,dw-pcie-4.60a", "snps,dw-pcie";
> + device_type = "pci";
> + reg = <0x1f052000 0x1000>, <0x1f053000 0x1000>, <0x1bdbf000 0x1000>;
> + reg-names = "dbi", "dbi2", "config";
> + #address-cells = <3>;
> + #size-cells = <2>;
> + ranges = <0x81000000 0 0x00000000 0x1bdb0000 0 0x00008000>,
> + <0x82000000 0 0x20000000 0x08000000 0 0x13db0000>;
> + bus-range = <0x0 0xff>;
> +
> + interrupts = <0 80 4>, <0 81 4>, <0 82 4>, <0 83 4>,
> + <0 84 4>, <0 85 4>, <0 86 4>, <0 87 4>,
> + <0 88 4>, <0 89 4>, <0 90 4>, <0 91 4>,
> + <0 92 4>, <0 93 4>;
> + interrupt-names = "dma0", "dma1", "dma2", "dma3", "dma4", "dma5", "dma6",
> + "dma7", "msi", "aer", "pme", "hp", "bw_mg", "l_eq";
> +
> + clocks = <&ccu_sys 1>, <&ccu_axi 6>, <&ccu_axi 7>, <&clk_pcie>;
> + clock-names = "dbi", "mstr", "slv", "ref";
> +
> + resets = <&ccu_axi 6>, <&ccu_axi 7>, <&ccu_sys 7>, <&ccu_sys 10>,
> + <&ccu_sys 4>, <&ccu_sys 6>, <&ccu_sys 5>, <&ccu_sys 8>,
> + <&ccu_sys 9>;
> + reset-names = "mstr", "slv", "pwr", "hot", "phy", "core", "pipe",
> + "sticky", "non-sticky";
> +
> + reset-gpios = <&port0 0 1>;
> +
> + num-lanes = <4>;
> + max-link-speed = <3>;
> + };
> +...
> --
> 2.35.1
>
>
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