linux-kernel - Re: [PATCH v8 1/4] dt-binding:Documents of the mbigen bindings

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Date:	Thu, 19 Nov 2015 18:53:51 +0800
From:	"majun (F)" <majun258@...wei.com>
To:	Marc Zyngier <marc.zyngier@....com>, <Catalin.Marinas@....com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <Will.Deacon@....com>,
	<mark.rutland@....com>, <jason@...edaemon.net>,
	<tglx@...utronix.de>, <lizefan@...wei.com>, <huxinwei@...wei.com>,
	<dingtianhong@...wei.com>, <zhaojunhua@...ilicon.com>,
	<liguozhu@...ilicon.com>, <xuwei5@...ilicon.com>,
	<wei.chenwei@...ilicon.com>, <guohanjun@...wei.com>,
	<wuyun.wu@...wei.com>, <guodong.xu@...aro.org>,
	<haojian.zhuang@...aro.org>, <zhangfei.gao@...aro.org>,
	<usman.ahmad@...aro.org>, <klimov.linux@...il.com>,
	<gabriele.paoloni@...wei.com>
Subject: Re: [PATCH v8 1/4] dt-binding:Documents of the mbigen bindings



在 2015/11/19 1:50, Marc Zyngier 写道:
> On 06/11/15 08:28, MaJun wrote:
>> From: Ma Jun <majun258@...wei.com>
>>
>> Add the mbigen msi interrupt controller bindings document.
>>
>> This patch based on Mark Rutland's patch
>> https://lkml.org/lkml/2015/7/23/558
>>
>> Signed-off-by: Ma Jun <majun258@...wei.com>
>> ---
>>  Documentation/devicetree/bindings/arm/mbigen.txt |   63 ++++++++++++++++++++++
>>  1 files changed, 63 insertions(+), 0 deletions(-)
>>  create mode 100644 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 100644
>> index 0000000..eb9a7fd
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/mbigen.txt
>> @@ -0,0 +1,63 @@
>> +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 generate the
>> +interrupt by writing ITS register.
>> +
>> +The mbigen chip and devices connect to mbigen have the following properties:
>> +
>> +Mbigen main node required properties:
>> +-------------------------------------------
>> +- compatible: Should be "hisilicon,mbigen-v2"
>> +- reg: Specifies the base physical address and size of the Mbigen
>> +  registers.
>> +- interrupt controller: Identifies the node as an interrupt controller
>> +- msi-parent: This property has two cells.
>> +	The 1st cell specifies the ITS this device connected.
>> +	The 2nd cell specifies the device id.
>> +- nr-msis:Specifies the total number of interrupt this device has.
> 
> So here you have the nr-msis property...

I'll change this to num-msis.

Thanks!
Ma Jun

> 
>> +- #interrupt-cells : Specifies the number of cells needed to encode an
>> +  interrupt source. The value is 2 now.
>> +
> 
> Just say "Must be 2".
> 
>> +  The 1st cell is global hardware pin number of the interrupt.
>> +		This value depends on the Soc design.
>> +  The 2nd cell is the interrupt trigger type.
>> +
>> +Examples:
>> +
>> + 	mbigen_device_gmac:intc {
>> +			compatible = "hisilicon,mbigen-v2";
>> +			reg = <0x0 0xc0080000 0x0 0x10000>;
>> +			interrupt-controller;
>> +			msi-parent = <&its_dsa 0x40b1c>;
>> +			num-msis = <9>;
> 
> ... and here this is num-msis.
> 
> Which one is it? The driver seems to use num-msis as well, but I have no
> idea which one is the right one.
> 
>> +			#interrupt-cells = <2>;
>> + 	};
>> +
>> +Devices connect to mbigen required properties:
>> +----------------------------------------------------
>> +-interrupt-parent: Specifies the mbigen device node which device connected.
>> +-interrupts:specifies the interrupt source.
>> +  The 1st cell is global hardware pin number of the interrupt.
>> +		This value depends on the Soc design.
>> +  The 2nd cell is the interrupt trigger type
>> +
>> +Examples:
>> +	gmac0: ethernet@...80000 {
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +		reg = <0 0xc2080000 0 0x20000>,
>> +		      <0 0xc0000000 0 0x1000>;
>> +		interrupt-parent  = <&mbigen_device_gmac>;
>> +		interrupts =	<656 1>,
>> +				<657 1>;
>> +	};
>> +
>>
> 
> Thanks,
> 
> 	M.
> 

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