linux-kernel - Re: [PATCH 3/4] Documetation: binding: modify the exynos5440 pcie binding

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Date:   Tue, 3 Jan 2017 13:51:44 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        bhelgaas@...gle.com, mark.rutland@....com, kgene@...nel.org,
        krzk@...nel.org, kishon@...com, jingoohan1@...il.com,
        vivek.gautam@...eaurora.org, pankaj.dubey@...sung.com,
        alim.akhtar@...sung.com, cpgs@...sung.com
Subject: Re: [PATCH 3/4] Documetation: binding: modify the exynos5440 pcie
 binding

On Wed, Dec 28, 2016 at 07:34:53PM +0900, Jaehoon Chung wrote:
> According to using PHY framework, modified the exynos5440-pcie binding.
> And use "config" property to follow the designware-pcie binding.

You are breaking compatibility here. Please state that and why it is 
okay to do so.

> 
> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> ---
>  .../bindings/pci/samsung,exynos5440-pcie.txt       | 29 +++++++++++++---------
>  1 file changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt b/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
> index 4f9d23d..51f6214 100644
> --- a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
> @@ -5,10 +5,15 @@ and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
>  - compatible: "samsung,exynos5440-pcie"
> -- reg: base addresses and lengths of the pcie controller,
> -	the phy controller, additional register for the phy controller.
> +- reg: base addresses and lengths of the pcie controller
>  - interrupts: A list of interrupt outputs for level interrupt,
>  	pulse interrupt, special interrupt.
> +- phys: From PHY binding. Phandle for the Generic PHY.
> +	Refer to Documentation/devicetree/bindings/phy/samsung-phy.txt
> +- phy-names: Must be "pcie-phy".

-names is pointless for a single element.

> +
> +Other common properties refer to
> +	Documentation/devicetree/binding/pci/designware-pcie.txt
>  
>  Example:
>  
> @@ -16,18 +21,18 @@ SoC specific DT Entry:
>  
>  	pcie@...000 {
>  		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> -		reg = <0x290000 0x1000
> -			0x270000 0x1000
> -			0x271000 0x40>;
> +		reg = <0x290000 0x1000>, <0x40000000 0x100>;

256 bytes of config space?

> +		reg-names = "elbi", "config";
>  		interrupts = <0 20 0>, <0 21 0>, <0 22 0>;
>  		clocks = <&clock 28>, <&clock 27>;
>  		clock-names = "pcie", "pcie_bus";
>  		#address-cells = <3>;
>  		#size-cells = <2>;
>  		device_type = "pci";
> -		ranges = <0x00000800 0 0x40000000 0x40000000 0 0x00001000   /* configuration space */
> -			  0x81000000 0 0	  0x40001000 0 0x00010000   /* downstream I/O */
> +		ranges = <0x81000000 0 0	  0x40001000 0 0x00010000   /* downstream I/O */
>  			  0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>; /* non-prefetchable memory */
> +		phys = <&pcie_phy0>;
> +		phy-names = "pcie-phy";
>  		#interrupt-cells = <1>;
>  		interrupt-map-mask = <0 0 0 0>;
>  		interrupt-map = <0 0 0 0 &gic GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
> @@ -36,17 +41,17 @@ SoC specific DT Entry:
>  
>  	pcie@...000 {
>  		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> -		reg = <0x2a0000 0x1000
> -			0x272000 0x1000
> -			0x271040 0x40>;
> +		reg = <0x2a0000 0x1000>, <0x60000000 0x1000>;
> +		reg-names = "elbi", "config";
>  		interrupts = <0 23 0>, <0 24 0>, <0 25 0>;
>  		clocks = <&clock 29>, <&clock 27>;
>  		clock-names = "pcie", "pcie_bus";
>  		#address-cells = <3>;
>  		#size-cells = <2>;
>  		device_type = "pci";
> -		ranges = <0x00000800 0 0x60000000 0x60000000 0 0x00001000   /* configuration space */
> -			  0x81000000 0 0	  0x60001000 0 0x00010000   /* downstream I/O */
> +		phys = <&pcie_phy1>;
> +		phy-names = "pcie-phy";
> +		ranges = <0x81000000 0 0	  0x60001000 0 0x00010000   /* downstream I/O */
>  			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>; /* non-prefetchable memory */
>  		#interrupt-cells = <1>;
>  		interrupt-map-mask = <0 0 0 0>;
> -- 
> 2.10.2
>