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Re: [PATCH v5 0/5] Functional dependencies between devices

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  Re: [PATCH v5 0/5] Functional dependencies between devices Lukas Wunner <lukas@wunner.de> - 2016-10-28 11:40 +0200
    Re: [PATCH v5 0/5] Functional dependencies between devices Hanjun Guo <hanjun.guo@linaro.org> - 2016-11-02 22:00 +0100

#1510993 — Re: [PATCH v5 0/5] Functional dependencies between devices

On Thu, Oct 27, 2016 at 08:19:27PM +0800, Hanjun Guo wrote:
> I'm trying to using this patch set to solve the functional dependency
> between devices and irqchip, which are both ACPI platform devices.
> irqchip needs to be probed before the devices connecting to them,
> which specifically, it's the mbi-gen support I send out recently:
> 
> https://lkml.org/lkml/2016/10/25/453
> 
> But I didn't see an example to do so in this patch set, and seems that
> some extra code needs to be added for that purpose, could you give me
> some suggestions for how to do that then I can work on and test against
> your patch set?

If the consumers can detect that there's a consumer on which they depend,
you could call device_link_add() from their ->probe hook.

Generally the earliest point in time when device links can be added is
after device_initialize() has been called for the consumer and device_add()
has been called for the supplier.  (At least that's my understanding.)

HTH,

Lukas

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#1514119

On 10/28/2016 05:39 PM, Lukas Wunner wrote:
> On Thu, Oct 27, 2016 at 08:19:27PM +0800, Hanjun Guo wrote:
>> I'm trying to using this patch set to solve the functional dependency
>> between devices and irqchip, which are both ACPI platform devices.
>> irqchip needs to be probed before the devices connecting to them,
>> which specifically, it's the mbi-gen support I send out recently:
>>
>> https://lkml.org/lkml/2016/10/25/453
>>
>> But I didn't see an example to do so in this patch set, and seems that
>> some extra code needs to be added for that purpose, could you give me
>> some suggestions for how to do that then I can work on and test against
>> your patch set?
>
> If the consumers can detect that there's a consumer on which they depend,
> you could call device_link_add() from their ->probe hook.
>
> Generally the earliest point in time when device links can be added is
> after device_initialize() has been called for the consumer and device_add()
> has been called for the supplier.  (At least that's my understanding.)

Thank you, currently I'm on travailing and will take a deep look to
see if it works (or adding things on top) on my case.

Thanks
Hanjun

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