On 11/06/2014 11:37 AM, Grant Likely wrote:
1) The base assumption must be that firmware sets up the pinctrl hardware into a usable state at boot and ACPI is used to adjust it as part of the normal OSPM runtime PM operations on devices.
On some SOCs, the GPIO controller and the pin control controller are the same device. So if the Linux driver owns GPIO, we can't have the UEFI runtime talk to the same hardware.
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