linux-kernel - Re: [PATCH v3 1/2] dt-bindings: PCI: Add UniPhier PCIe endpoint controller description

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Date:   Fri, 8 May 2020 17:39:42 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <andrew.murray@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: PCI: Add UniPhier PCIe endpoint
 controller description

On 2020/03/23 18:40, Kunihiko Hayashi wrote:
> Add DT bindings for PCIe controller implemented in UniPhier SoCs
> when configured in endpoint mode. This controller is based on
> the DesignWare PCIe core.
> 
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>   .../devicetree/bindings/pci/uniphier-pcie-ep.txt   | 53 ++++++++++++++++++++++
>   MAINTAINERS                                        |  2 +-
>   2 files changed, 54 insertions(+), 1 deletion(-)
>   create mode 100644 Documentation/devicetree/bindings/pci/uniphier-pcie-ep.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/uniphier-pcie-ep.txt b/Documentation/devicetree/bindings/pci/uniphier-pcie-ep.txt
> new file mode 100644
> index 0000000..072dc78
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/uniphier-pcie-ep.txt
> @@ -0,0 +1,53 @@
> +Socionext UniPhier PCIe endpoint controller bindings
> +
> +This describes the devicetree bindings for PCIe endpoint controller
> +implemented on Socionext UniPhier SoCs.
> +
> +UniPhier PCIe endpoint controller is based on the Synopsys DesignWare
> +PCI core. It shares common functions with the PCIe DesignWare core driver
> +and inherits common properties defined in
> +Documentation/devicetree/bindings/pci/designware-pcie.txt.
> +
> +Required properties:
> +- compatible: Should be
> +	"socionext,uniphier-pro5-pcie-ep" for Pro5 SoC
> +- reg: Specifies offset and length of the register set for the device.
> +	According to the reg-names, appropriate register sets are required.
> +- reg-names: Must include the following entries:
> +	"dbi"        - controller configuration registers
> +	"dbi2"       - controller configuration registers for shadow
> +	"link"       - SoC-specific glue layer registers
> +	"addr_space" - PCIe configuration space
> +- clocks: A phandle to the clock gate for PCIe glue layer including
> +	the endpoint controller.
> +- clock-names: Should contain the following:
> +	"gio", "link" - for Pro5 SoC
> +- resets: A phandle to the reset line for PCIe glue layer including
> +	the endpoint controller.
> +- reset-names: Should contain the following:
> +	"gio", "link" - for Pro5 SoC
> +
> +Optional properties:
> +- phys: A phandle to generic PCIe PHY. According to the phy-names, appropriate
> +	phys are required.
> +- phy-names: Must be "pcie-phy".
> +
> +Example:
> +
> +	pcie_ep: pcie-ep@...00000 {
> +		compatible = "socionext,uniphier-pro5-pcie-ep",
> +			     "snps,dw-pcie-ep";
> +		status = "disabled";
> +		reg-names = "dbi", "dbi2", "link", "addr_space";
> +		reg = <0x66000000 0x1000>, <0x66001000 0x1000>,
> +		      <0x66010000 0x10000>, <0x67000000 0x400000>;
> +		clock-names = "gio", "link";
> +		clocks = <&sys_clk 12>, <&sys_clk 24>;
> +		reset-names = "gio", "link";
> +		clocks = <&sys_rst 12>, <&sys_rst 24>;

This example contains a mistake. I'll fix it.

> +		num-ib-windows = <16>;
> +		num-ob-windows = <16>;
> +		num-lanes = <4>;
> +		phy-names = "pcie-phy";
> +		phys = <&pcie_phy>;
> +	};
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 50e8b90..01a4631 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13151,7 +13151,7 @@ PCIE DRIVER FOR SOCIONEXT UNIPHIER
>   M:	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
>   L:	linux-pci@...r.kernel.org
>   S:	Maintained
> -F:	Documentation/devicetree/bindings/pci/uniphier-pcie.txt
> +F:	Documentation/devicetree/bindings/pci/uniphier-pcie*.txt
>   F:	drivers/pci/controller/dwc/pcie-uniphier.c
>   
>   PCIE DRIVER FOR ST SPEAR13XX
> 

It is my chance to convert this to dt-schema.
I'll fix above and send dt-schema version in next.

Thank you,
  
---
Best Regards
Kunihiko Hayashi