Subject: Re: [PATCH v8 1/4] dt-binding:Documents of the mbigen bindings
To: Marc Zyngier <marc.zyngier@arm.com>, <Catalin.Marinas@arm.com>,
        <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
        <Will.Deacon@arm.com>, <mark.rutland@arm.com>, <jason@lakedaemon.net>,
        <tglx@linutronix.de>, <lizefan@huawei.com>, <huxinwei@huawei.com>,
        <dingtianhong@huawei.com>, <zhaojunhua@hisilicon.com>,
        <liguozhu@hisilicon.com>, <xuwei5@hisilicon.com>,
        <wei.chenwei@hisilicon.com>, <guohanjun@huawei.com>,
        <wuyun.wu@huawei.com>, <guodong.xu@linaro.org>,
        <haojian.zhuang@linaro.org>, <zhangfei.gao@linaro.org>,
        <usman.ahmad@linaro.org>, <klimov.linux@gmail.com>,
        <gabriele.paoloni@huawei.com>
References: <1446798522-28000-1-git-send-email-majun258@huawei.com>
 <1446798522-28000-2-git-send-email-majun258@huawei.com>
 <564CBA7C.3030500@arm.com>
From: "majun (F)" <majun258@huawei.com>
Message-ID: <564DAA3F.5020902@huawei.com>
Date: Thu, 19 Nov 2015 18:53:51 +0800
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在 2015/11/19 1:50, Marc Zyngier 写道:
> On 06/11/15 08:28, MaJun wrote:
>> From: Ma Jun <majun258@huawei.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@huawei.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@c2080000 {
>> +		#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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