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

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Date:   Fri, 28 Oct 2016 11:39:59 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Hanjun Guo <guohanjun@...wei.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Mark Brown <broonie@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Luis R. Rodriguez" <mcgrof@...e.com>
Subject: 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