linux-kernel - Re: [PATCH v7 5/6] Documentation: dt-bindings: pci: altera pcie device tree binding

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Date:	Fri, 25 Sep 2015 22:55:06 -0500
From:	Rob Herring <robh@...nel.org>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Dinh Nguyen <dinguyen@...nsource.altera.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, lftan.linux@...il.com,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v7 5/6] Documentation: dt-bindings: pci: altera pcie
 device tree binding

On 09/20/2015 09:13 PM, Ley Foon Tan wrote:
> This patch adds the bindings for Altera PCIe host controller driver and
> Altera PCIe MSI driver.
> 
> Signed-off-by: Ley Foon Tan <lftan@...era.com>
> ---
>  .../devicetree/bindings/pci/altera-pcie-msi.txt    | 28 +++++++++++++
>  .../devicetree/bindings/pci/altera-pcie.txt        | 49 ++++++++++++++++++++++
>  2 files changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/altera-pcie-msi.txt
>  create mode 100644 Documentation/devicetree/bindings/pci/altera-pcie.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/altera-pcie-msi.txt b/Documentation/devicetree/bindings/pci/altera-pcie-msi.txt
> new file mode 100644
> index 0000000..53ad2388
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/altera-pcie-msi.txt
> @@ -0,0 +1,28 @@
> +* Altera PCIe MSI controller
> +
> +Required properties:
> +- compatible:	should contain "altr,msi-1.0"
> +- reg:		specifies the physical base address of the controller and
> +		the length of the memory mapped region.
> +- reg-names:	must include the following entries:
> +		"csr": CSR registers
> +		"vector_slave": vectors slave port region
> +- interrupt-parent:	interrupt source phandle.
> +- interrupts:	specifies the interrupt source of the parent interrupt
> +		controller. The format of the interrupt specifier depends on the
> +		parent interrupt controller.
> +- num-vectors:	number of vectors, range 1 to 32.
> +- msi-controller:	indicates that this is MSI controller node
> +
> +
> +Example
> +msi0: msi@...F200000 {
> +	compatible = "altr,msi-1.0";
> +	reg = <0xFF200000 0x00000010
> +		0xFF200010 0x00000080>;
> +	reg-names = "csr", "vector_slave";
> +	interrupt-parent = <&hps_0_arm_gic_0>;
> +	interrupts = <0 42 4>;
> +	msi-controller = <1>;

This should not have a value.

> +	num-vectors = <32>;
> +};
> diff --git a/Documentation/devicetree/bindings/pci/altera-pcie.txt b/Documentation/devicetree/bindings/pci/altera-pcie.txt
> new file mode 100644
> index 0000000..4440db1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/altera-pcie.txt
> @@ -0,0 +1,49 @@
> +* Altera PCIe controller
> +
> +Required properties:
> +- compatible :	should contain "altr,pcie-root-port-1.0"
> +- reg:		a list of physical base address and length for TXS and CRA.
> +- reg-names:	must include the following entries:
> +		"Txs" or "txs": TX slave port region
> +		"Cra" or "cra": Control register access region

Why both cases? Can we please just have one (or none is better IMO).

txs contains the config space?

> +- interrupt-parent:	interrupt source phandle.
> +- interrupts:	specifies the interrupt source of the parent interrupt controller.
> +		The format of the interrupt specifier depends on the parent interrupt
> +		controller.
> +- device_type:	must be "pci"
> +- #address-cells:	set to <3>
> +- #size-cells:	set to <2>
> +- #interrupt-cells:	set to <1>
> +- ranges:		describes the translation of addresses for root ports and standard
> +		PCI regions.
> +- interrupt-map-mask and interrupt-map: standard PCI properties to define the
> +		mapping of the PCIe interface to interrupt numbers.
> +
> +Optional properties:
> +- msi-parent:	Link to the hardware entity that serves as the MSI controller for this PCIe
> +		controller.
> +- bus-range:	PCI bus numbers covered
> +
> +Example
> +	pcie_0: pcie@...00000000 {
> +		compatible = "altr,pcie-root-port-1.0";
> +		reg = <0xc0000000 0x20000000>,
> +			<0xff220000 0x00004000>;
> +		reg-names = "Txs", "Cra";
> +		interrupt-parent = <&hps_0_arm_gic_0>;
> +		interrupts = <0 40 4>;
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +		bus-range = <0x0 0xFF>;
> +		device_type = "pci";
> +		msi-parent = <&msi_to_gic_gen_0>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		interrupt-map-mask = <0 0 0 7>;
> +		interrupt-map = <0 0 0 1 &pcie_0 1>,
> +			            <0 0 0 2 &pcie_0 2>,
> +			            <0 0 0 3 &pcie_0 3>,
> +			            <0 0 0 4 &pcie_0 4>;
> +		ranges = <0x82000000 0x00000000 0x00000000 0xc0000000 0x00000000 0x10000000
> +			    0x82000000 0x00000000 0x10000000 0xd0000000 0x00000000 0x10000000>;
> +	};
> 

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