linux-kernel - Re: [PATCH 2/2] spi: Add ADI driver for Spreadtrum platform

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Date:   Thu, 7 Sep 2017 19:21:10 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Baolin Wang <baolin.wang@...eadtrum.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] spi: Add ADI driver for Spreadtrum platform

On 7 September 2017 at 18:10, Mark Brown <broonie@...nel.org> wrote:
> On Thu, Sep 07, 2017 at 11:13:00AM +0800, Baolin Wang wrote:
>
>> >> +static int __init sprd_adi_init(void)
>> >> +{
>> >> +     return platform_driver_register(&sprd_adi_driver);
>> >> +}
>> >> +subsys_initcall(sprd_adi_init);
>
>> > Why is this subsys_initcall() and not module_platform_driver()?
>
>> Since ADI is one very fundamental driver for our SoC, many drivers
>> such as regulator need depend on ADI, and regulator need to regulate
>> core voltage as earlier as possible.
>
> That applies to huge numbers of systems - you should still just use
> regular init ordering in mainline, there are efforts to make things
> better there (look at Viresh's dependency stuff) so hopefully things
> will improve in the future and in the meantime the cost of probe
> deferral isn't *that* great and it's less fiddly than tweaking ordering.
> Practically speaking init ordering stuff can always be added in vendor
> kernels in the meantime.

Make sense. So I change back to module_platform_driver().

-- 
Baolin.wang
Best Regards