On Mon, Sep 08, 2014 at 01:22:44PM -0700, Stephen Boyd wrote:

> Where is this described? From the commit text that introduces
> IORESOURCE_REG I see:

> "Currently a bunch of I2C/SPI MFD drivers are using IORESOURCE_IO for
> register address ranges. Since this causes some confusion due to the
> primary use of this resource type for PCI/ISA I/O ports create a new
> resource type IORESOURCE_REG."

> And the comment next to the #define says "Register offsets". I don't see
> anywhere where it mentions these are CPU addresses. Certainly the
> current IORESOURCE_REG users aren't CPU addresses because they're
> SPI/I2C device drivers.

Right, the intention was specifically to handle things where
IORESOURCE_MEM wasn't appropriate as it wasn't ever going to be memory
mapped I/O and should be in a separate address space.