linux-kernel - Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

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Date:   Wed, 4 Nov 2020 15:35:39 -0600
From:   Rob Herring <robh@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     linux-samsung-soc@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie
 binding

On Thu, Oct 29, 2020 at 02:40:13PM +0100, Marek Szyprowski wrote:
> Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
> variant). Based on the text dt-binding posted by Jaehoon Chung.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
>  1 file changed, 119 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> new file mode 100644
> index 000000000000..1810bf722350
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> @@ -0,0 +1,119 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/samsung,exynos-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung SoC series PCIe Host Controller Device Tree Bindings
> +
> +maintainers:
> +  - Marek Szyprowski <m.szyprowski@...sung.com>
> +  - Jaehoon Chung <jh80.chung@...sung.com>
> +
> +description: |+
> +  Exynos5433 SoC PCIe host controller is based on the Synopsys DesignWare
> +  PCIe IP and thus inherits all the common properties defined in
> +  designware-pcie.txt.
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> +  compatible:
> +    const: samsung,exynos5433-pcie
> +
> +  reg:
> +    items:
> +      - description: Data Bus Interface (DBI) registers.
> +      - description: External Local Bus interface (ELBI) registers.
> +      - description: PCIe configuration space region.
> +
> +  reg-names:
> +    items:
> +      - const: dbi
> +      - const: elbi
> +      - const: config
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: PCIe bridge clock
> +      - description: PCIe bus clock
> +
> +  clock-names:
> +    items:
> +      - const: pcie
> +      - const: pcie_bus
> +
> +  phys:
> +    maxItems: 1
> +
> +  vdd10-supply:
> +    description:
> +      Phandle to a regulator that provides 1.0V power to the PCIe block.
> +
> +  vdd18-supply:
> +    description:
> +      Phandle to a regulator that provides 1.8V power to the PCIe block.
> +
> +  num-lanes:
> +    const: 1
> +
> +  num-viewport:
> +    const: 3

I'm confused why you need this. This is only used with the iATU except 
for keystone. Platforms like Exynos with their own child bus config 
space accessors don't have an iATU. 

BTW, for cases with an iATU, I'm working on making the number of 
viewports runtime detected.

> +
> +required:
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - "#address-cells"
> +  - "#size-cells"
> +  - "#interrupt-cells"
> +  - interrupt-map
> +  - interrupt-map-mask
> +  - ranges
> +  - bus-range
> +  - device_type
> +  - num-lanes
> +  - num-viewport
> +  - clocks
> +  - clock-names
> +  - phys
> +  - vdd10-supply
> +  - vdd18-supply
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/exynos5433.h>
> +
> +    pcie: pcie@...00000 {
> +        compatible = "samsung,exynos5433-pcie";
> +        reg = <0x15700000 0x1000>, <0x156b0000 0x1000>, <0x0c000000 0x1000>;
> +        reg-names = "dbi", "elbi", "config";
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        #interrupt-cells = <1>;
> +        device_type = "pci";
> +        interrupts = <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&cmu_fsys CLK_PCIE>, <&cmu_fsys CLK_PCLK_PCIE_PHY>;
> +        clock-names = "pcie", "pcie_bus";
> +        phys = <&pcie_phy>;
> +        pinctrl-0 = <&pcie_bus &pcie_wlanen>;
> +        pinctrl-names = "default";
> +        num-lanes = <1>;
> +        num-viewport = <3>;
> +        bus-range = <0x00 0xff>;
> +        ranges = <0x81000000 0 0	  0x0c001000 0 0x00010000>,
> +                 <0x82000000 0 0x0c011000 0x0c011000 0 0x03feefff>;
> +        vdd10-supply = <&ldo6_reg>;
> +        vdd18-supply = <&ldo7_reg>;
> +        interrupt-map-mask = <0 0 0 0>;
> +        interrupt-map = <0 0 0 0 &gic GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> +...
> -- 
> 2.17.1
>