linux-kernel - Re: [PATCH v4 2/2] dt-binding:Documents of the mbigen bindings

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Date:	Wed, 23 Sep 2015 15:24:46 +0800
From:	"majun (F)" <majun258@...wei.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"huxinwei@...wei.com" <huxinwei@...wei.com>,
	"dingtianhong@...wei.com" <dingtianhong@...wei.com>,
	"zhaojunhua@...ilicon.com" <zhaojunhua@...ilicon.com>,
	"liguozhu@...ilicon.com" <liguozhu@...ilicon.com>,
	"xuwei5@...ilicon.com" <xuwei5@...ilicon.com>,
	"wei.chenwei@...ilicon.com" <wei.chenwei@...ilicon.com>,
	"guohanjun@...wei.com" <guohanjun@...wei.com>,
	"wuyun.wu@...wei.com" <wuyun.wu@...wei.com>,
	"guodong.xu@...aro.org" <guodong.xu@...aro.org>,
	"haojian.zhuang@...aro.org" <haojian.zhuang@...aro.org>,
	"zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
	"usman.ahmad@...aro.org" <usman.ahmad@...aro.org>
Subject: Re: [PATCH v4 2/2] dt-binding:Documents of the mbigen bindings



在 2015/9/22 22:41, Marc Zyngier 写道:
> On Tue, 22 Sep 2015 19:35:38 +0800
> "majun (F)" <majun258@...wei.com> wrote:
> 
[...]
>>>> +Examples:
>>>> +	smmu_dsa {
>>>> +		compatible = "arm,smmu-v3";
>>>> +		reg = <0x0 0xc0040000 0x0 0x20000>;
>>>> +		interrupt-parent  = <&mbigen_dsa>;
>>>> +		interrupts = <0x40b20 6 78 1>,
>>>> +				<0x40b20 6 79 1>,
>>>> +				<0x40b20 6 80 1>;
>>>> +	};
>>>> +
>>>
>>> I find the current split very confusing. In your example, the interrupt
>>> controller is the mbigen block, which forces you to encode the DevID as
>>> part of the interrupt specifier. This doesn't feel like an ideal
>>> design, because you end up duplicating the DevID information at both
>>> the "client" device and the mbi_device.
>>>
>>> I'd be more inclined to have the mbi_device itself be the interrupt
>>> controller for the client device. This would eliminate information
>>> duplication, and reflect the hardware (or what I understand of the
>>> hardware) a bit more.
>>
>> Do you mean make the dts likes below?
>>
>>
>> 		mbigen_dsa: interrupt-controller@...80000 {
>> 			compatible = "hisilicon,mbigen-v2";
>> 			interrupt-controller;
>> 			#interrupt-cells = <5>;
> 
> These two statements shouldn't be here...

According to you suggest that irq chip should be probed with IRQCHIP_DECLARE(),
I think the compatible string also should be moved into mbigen_clinet_device node.

And, changing mbigen driver likes below:

IRQCHIP_DECLARE(hisi_mbigen, "hisilicon,mbigen-v2", mbigen_of_init);

Thanks!
Ma Jun

> 
>> 			#mbigen-node-cells = <3>;
>> 			reg = <0xc0080000 0x10000>;
>> 			
>> 			mbigen_client_device1 {
>> 				msi-parent = <&its 0x40b1c>;
>> 				nr-interrupts = <9>;
>> 				interrupt-controller;
> 
> This is where #interrupt-cells should be.
> 
>> 			}
>>
>> 			mbigen_client_device2{
>> 				msi-parent = <&its 0x40b1d>;
>> 				nr-interrupts = <3>;
>> 				interrupt-controller;
>> 			}
>> 		};
>>
>>
>> 	client_device1 {
>> 		compatible = "arm,smmu-v3";
>> 		reg = <0x0 0xc0040000 0x0 0x20000>;
>> 		interrupt-parent  = <&mbigen_client_device1>;
>> 		interrupts = <pin_offset 78 1>,
>> 				<pin_offset 79 1>,
>> 				<pin_offset 80 1>;
>> 	};
>>
>>
> 
> But otherwise, this looks better.
> 
> Thanks,
> 
> 	M.
> 

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