Re: [PATCH v2 4/6] dt-bindings: rockchip: Add DesignWare based PCIe controller

[Rob Herring <robh@kernel.org>]

On Thu, Feb 13, 2020 at 02:08:09PM +0800, Shawn Lin wrote:
> From: Simon Xue <xxm@rock-chips.com>
> 
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
> 
> ---
> 
> Changes in v2:
> - fix yaml format
> 
>  .../devicetree/bindings/pci/rockchip-dw-pcie.yaml  | 148 +++++++++++++++++++++
>  1 file changed, 148 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
> new file mode 100644
> index 0000000..527c770
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
> @@ -0,0 +1,148 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/rockchip-dw-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: DesignWare based PCIe RC controller on Rockchip SoCs
> +
> +maintainers:
> +  - Shawn Lin <shawn.lin@rock-chips.com>
> +  - Simon Xue <xxm@rock-chips.com>
> +
> +# We need a select here so we don't match all nodes with 'snps,dw-pcie'
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        const: rockchip,rk1808-pcie
> +  required:
> +    - compatible
> +

Need to reference pci-bus.yaml.

> +properties:
> +  compatible:
> +    enum:
> +      - rockchip,rk1808-pcie
> +      - snps,dw-pcie

Doesn't match the example. This says 1 string that either of the 2 
strings.

> +
> +  reg:
> +    maxItems: 1

Example shows 2. If so, need to define here what each one is.

> +
> +  clocks:
> +    items:
> +      - description: High speed clock for PCIe
> +      - description: Low speed clock for PCIe
> +      - description: AHB clock for PCIe
> +      - description: APB clock for PCIe
> +      - description: Auxiliary clock for PCIe
> +
> +  clock-names:
> +    items:
> +      - const: hsclk
> +      - const: lsclk
> +      - const: aclk
> +      - const: pclk
> +      - const: sclk-aux
> +
> +  resets:
> +    items:
> +      - description: PCIe niu high reset line
> +      - description: PCIe niu low reset line
> +      - description: PCIe grf reset line
> +      - description: PCIe control reset line
> +      - description: PCIe control powerup reset line
> +      - description: PCIe control master reset line
> +      - description: PCIe control slave reset line
> +      - description: PCIe control dbi reset line
> +      - description: PCIe control button reset line
> +      - description: PCIe control power engine reset line
> +      - description: PCIe control core reset line
> +      - description: PCIe control non-sticky reset line
> +      - description: PCIe control sticky reset line
> +      - description: PCIe control power reset line
> +      - description: PCIe niu ahb reset line
> +      - description: PCIe niu apb reset line
> +
> +  reset-names:
> +    items:
> +      - const: niu-h
> +      - const: niu-l
> +      - const: grf-p
> +      - const: ctl-p
> +      - const: ctl-powerup
> +      - const: ctl-mst-a
> +      - const: ctl-slv-a
> +      - const: ctl-dbi-a
> +      - const: ctl-button
> +      - const: ctl-pe
> +      - const: ctl-core
> +      - const: ctl-nsticky
> +      - const: ctl-sticky
> +      - const: ctl-pwr
> +      - const: ctl-niu-a
> +      - const: ctl-niu-p
> +
> +  rockchip,usbpciegrf:
> +    enum:
> +      - rockchip,usbpciegrf
> +    description: The grf for COMBPHY configuration and state registers.

COMBOPHY?

Why isn't this part of the phy node?

> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +  - reg
> +  - clocks
> +  - clock-names
> +  - msi-map
> +  - num-lanes
> +  - phys
> +  - phy-names
> +  - ranges
> +  - resets
> +  - reset-names
> +  - rockchip,usbpciegrf
> +  - reset-gpios
> +
> +additionalProperties: false

With pci-bus.yaml included, this will have to be 
'unevaluatedProperties: false'.

> +
> +examples:
> +  - |
> +    pcie0: pcie@fc400000 {

Unit address should be first entry in 'reg'.

> +      compatible = "rockchip,rk1808-pcie", "snps,dw-pcie";
> +      #address-cells = <3>;
> +      #size-cells = <2>;
> +      bus-range = <0x0 0x1f>;
> +      reg = <0x0 0xfc000000 0x0 0x400000>,
> +            <0x0 0xfc400000 0x0 0x10000>;
> +      clocks = <&cru HSCLK_PCIE>, <&cru LSCLK_PCIE>,
> +               <&cru ACLK_PCIE>, <&cru PCLK_PCIE>,
> +               <&cru SCLK_PCIE_AUX>;
> +      clock-names = "hsclk", "lsclk",
> +                    "aclk", "pclk",
> +                    "sclk-aux";
> +      msi-map = <0x0 &its 0x0 0x1000>;
> +      num-lanes = <2>;
> +      phys = <&combphy PHY_TYPE_PCIE>;

Not documented.

> +      phy-names = "pcie-phy";

Not documented. Not really needed if only 1.

> +      ranges = <0x00000800 0x0 0xf8000000 0x0 0xf8000000 0x0 0x800000
> +                0x83000000 0x0 0xf8800000 0x0 0xf8800000 0x0 0x3700000
> +                0x81000000 0x0 0xfbf00000 0x0 0xfbf00000 0x0 0x100000>;
> +      resets = <&cru SRST_PCIE_NIU_H>, <&cru SRST_PCIE_NIU_L>,
> +               <&cru SRST_PCIEGRF_P>, <&cru SRST_PCIECTL_P>,
> +               <&cru SRST_PCIECTL_POWERUP>, <&cru SRST_PCIECTL_MST_A>,
> +               <&cru SRST_PCIECTL_SLV_A>, <&cru SRST_PCIECTL_DBI_A>,
> +               <&cru SRST_PCIECTL_BUTTON>, <&cru SRST_PCIECTL_PE>,
> +               <&cru SRST_PCIECTL_CORE>, <&cru SRST_PCIECTL_NSTICKY>,
> +               <&cru SRST_PCIECTL_STICKY>, <&cru SRST_PCIECTL_PWR>,
> +               <&cru SRST_PCIE_NIU_A>, <&cru SRST_PCIE_NIU_P>;
> +      reset-names = "niu-h", "niu-l", "grf-p", "ctl-p",
> +                    "ctl-powerup", "ctl-mst-a", "ctl-slv-a",
> +                    "ctl-dbi-a", "ctl-button", "ctl-pe",
> +                    "ctl-core", "ctl-nsticky", "ctl-sticky",
> +                    "ctl-pwr", "ctl-niu-a", "ctl-niu-p";
> +      rockchip,usbpciegrf = <&usb_pcie_grf>;
> +      reset-gpios = <&gpio0 RK_PB6 GPIO_ACTIVE_HIGH>;
> +    };
> +
> +...
> -- 
> 1.9.1
> 
> 
>