linux-kernel - Re: Regulator probe

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Date:   Thu, 1 Sep 2016 16:38:36 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Hunter, Adrian" <adrian.hunter@...el.com>
Subject: Re: Regulator probe

On Thu, Sep 01, 2016 at 05:53:43PM +0300, Andy Shevchenko wrote:

> [   20.843973] calling  sdhci_drv_init+0x0/0x20 @ 1
> [   20.843976] sdhci: Secure Digital Host Controller Interface driver
> [   20.843978] sdhci: Copyright(c) Pierre Ossman
> [   20.843989] initcall sdhci_drv_init+0x0/0x20 returned 0 after 5 usecs
> [   20.843999] calling  sdhci_driver_init+0x0/0x1b @ 1
> 
> [   20.881460] sdhci-pci 0000:00:01.3: SDHCI controller found
> [8086:1190] (rev 1)
> [   20.881471] sdhci-pci 0000:00:01.3: found 1 slot(s)
> [   20.888242] sdhci-pci 0000:00:01.3: No vmmc regulator found

> ^^^^^ PROBLEM!
> 
> Regulator is present, though it's in a waiting list.

The device isn't registered and it's saying it isn't registered, this is
normal.  Since this is an ACPI system we are expecting the firmware or
whatever else registers devices and their supplies to do that, if the
supplies aren't being mapped at device registration time then you're
telling the core not to expect any.  If you had mapped the supply and it
wasn't available the consumer would get an -EPROBE_DEFER.

As I keep saying with all these problems if you want to reimplement DT
instead of using it you need to reimplement *all* of DT, it's there for
a reason.  It would be a lot quicker and simpler to just use DT for
these systems.

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