linux-kernel - Re: [PATCH 4/4]:dt-binding:Documents the mbigen bindings

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Date:	Mon, 1 Jun 2015 11:04:31 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"majun (F)" <majun258@...wei.com>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <Will.Deacon@....com>,
	Marc Zyngier <Marc.Zyngier@....com>
Subject: Re: [PATCH 4/4]:dt-binding:Documents the mbigen bindings

On Sat, May 30, 2015 at 04:19:18AM +0100, majun (F) wrote:
> Add the mbigen msi interrupt controller bindings document
> 
> 
> Signed-off-by: Ma Jun <majun258@...wei.com>
> ---
>  Documentation/devicetree/bindings/arm/mbigen.txt |   51 ++++++++++++++++++++++
>  1 files changed, 51 insertions(+), 0 deletions(-)
>  create mode 100755 Documentation/devicetree/bindings/arm/mbigen.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/mbigen.txt b/Documentation/devicetree/bindings/arm/mbigen.txt
> new file mode 100755
> index 0000000..d442b31
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/mbigen.txt
> @@ -0,0 +1,51 @@
> +Hisilicon mbigen device tree bindings.
> +=======================================
> +
> +Mbigen means: message based interrupt generator.
> +
> +MBI is kind of msi interrupt only used on Non-PCI devices.
> +
> +To reduce the wired interrupt number connected to GIC,
> +Hisilicon designed mbigen to collect and generate interrupt.
> +
> +
> +Non-pci devices can connect to mbigen and gnerate the inteerrupt
> +by wirtting ITS register.

Typos.

> +
> +The mbigen and devices connect to mbigen have the following properties:
> +
> +
> +Mbigen required properties:
> +-------------------------------------------
> +-compatible: Should be "hisilicon,mbi-gen"
> +-msi-parent: should specified the ITS mbigen connected
> +-interrupt controller: Identifies the node as an interrupt controller
> +- #interrupt-cells : Specifies the number of cells needed to encode an
> +  interrupt source. The value is 2 for now.

The precise format of these cells needs to be specified, at this point
in the binding document.

Why do you say "The value is 2 for now"? Do you expect this to grow in
future? If so, why?

> +- reg: Specifies the base physical address and size of the ITS
> +  registers.

This doesn't sound right. This isn't the ITS, so it shouldn't refer to
the ITS registers in this manner.

Does the mbigen not have its own set of registers?

Thanks,
Mark.

> +
> +Examples:
> +
> +	mbigen_pa: interrupt-controller@...30000 {
> +			compatible = "hisilicon,mbi-gen";
> +			msi-parent = <&its_pa>;
> +			interrupt-controller;
> +			#interrupt-cells = <2>;
> +			reg = <0x4c030000 0x10000>;
> +		};
> +
> +Device connect to mbigen required properties:
> +----------------------------------------------------
> +-interrupt-parent: Specifies the mbigen node which device connected.
> +-interrupts:specifies the interrupt source.The first cell is hwirq num, the
> +  second number is trigger type.
> +
> +Examples:
> +	usb0: ehci@...00000 {
> +		compatible = "generic-ehci";
> +		interrupt-parent = <&mbigen_pa>;
> +		reg = <0xa1000000 0x10000>;
> +		interrupts = <20 4>;
> +	};
> +
> -- 
> 1.7.1
> 
> 
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