On 04/14/15 15:38, Adrian Hunter wrote:
To enumerate a SDIO card the mmc core first needs to apply power to
> it. At this point the PM domain isn't yet attached to the SDIO func
> device (the device doesn't even exist yet) and thus it can't be used
> to provide power the card. Right?
In the ACPI case the SDIO function device ACPI nodes are children of the
host controller ACPI node. One possibility is to have the host controller
driver power on its children.
This has recently been added to the DT as well as some SDIO devices
first need to be powered to be discoverable.
Regards,
Arend
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