linux-kernel - Re: [PATCH v4 2/4] arm64: dts: APM X-Gene PCIe device tree nodes

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Date:	Wed, 12 Mar 2014 17:31:25 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Tanmay Inamdar' <tinamdar@....com>
Cc:	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Jason Gunthorpe' <jgunthorpe@...idianresearch.com>,
	'Grant Likely' <grant.likely@...aro.org>,
	'Rob Herring' <robh+dt@...nel.org>,
	'Catalin Marinas' <catalin.marinas@....com>,
	'Rob Landley' <rob@...dley.net>,
	'Liviu Dudau' <liviu.dudau@....com>, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	patches@....com, jcm@...hat.com, 'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v4 2/4] arm64: dts: APM X-Gene PCIe device tree nodes

On Thursday, March 06, 2014 3:06 PM, Tanmay Inamdar wrote:
> 
> This patch adds the device tree nodes for APM X-Gene PCIe controller and
> PCIe clock interface. Since X-Gene SOC supports maximum 5 ports, 5 dts
> nodes are added.
> 
> Signed-off-by: Tanmay Inamdar <tinamdar@....com>
> ---
>  arch/arm64/boot/dts/apm-mustang.dts |    8 ++
>  arch/arm64/boot/dts/apm-storm.dtsi  |  155 +++++++++++++++++++++++++++++++++++
>  2 files changed, 163 insertions(+)

[.....]

> --- a/arch/arm64/boot/dts/apm-storm.dtsi
> +++ b/arch/arm64/boot/dts/apm-storm.dtsi

[.....]

> +
> +		pcie0: pcie@...b0000 {
> +			status = "disabled";
> +			device_type = "pci";
> +			compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
> +			#interrupt-cells = <1>;
> +			#size-cells = <2>;
> +			#address-cells = <3>;
> +			reg = < 0x00 0x1f2b0000 0x0 0x00010000   /* Controller registers */
> +				0xe0 0xd0000000 0x0 0x00200000>; /* PCI config space */
> +			reg-names = "csr", "cfg";
> +			ranges = <0x01000000 0x00 0x00000000 0xe0 0x00000000 0x00 0x00010000   /* io */
> +				  0x02000000 0x00 0x10000000 0xe0 0x10000000 0x00 0x80000000>; /* mem */
                                                                          ^^^

I have a question about the fourth number '0xe0' of 'ranges' property.
Would you let me know what the '0xe0' means?

Best regards,
Jingoo Han

> +			dma-ranges = <0x42000000 0x40 0x00000000 0x40 0x00000000 0x40 0x00000000>;
> +			interrupt-map-mask = <0x0 0x0 0x0 0x7>;
> +			interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xc2 0x1
> +					 0x0 0x0 0x0 0x2 &gic 0x0 0xc3 0x1
> +					 0x0 0x0 0x0 0x3 &gic 0x0 0xc4 0x1
> +					 0x0 0x0 0x0 0x4 &gic 0x0 0xc5 0x1>;
> +			clocks = <&pcie0clk 0>;
> +		};

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