On Tue, Jun 25, 2013 at 5:31 PM, Stephen Warren [off-list ref] wrote:

On 06/25/2013 08:56 AM, Linus Walleij wrote:

quoted

On Fri, Jun 21, 2013 at 11:17 PM, Stephen Warren [off-list ref] wrote:

quoted

On 06/20/2013 05:57 AM, Christian Ruppert wrote:

quoted

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Your remark seems to reflect one of the following two hardware
architectures:

                                                     +- SPI
                 Physical pins --- GPIO --- pinctrl -+- I2C
                                                     +- mmc

(that's diagram 1)

quoted

                                +- GPIO
                 Physical pins -+           +- SPI
                                +- pinctrl -+- I2C
                                            +- mmc

(that's diagram 2)

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TB10x hardware architecture:

                                            +- SPI
                 Physical pins --- pinctrl -+- I2C
                                            +- mmc
                                            +- GPIO

(that's diagram 3)

No, I was thinking of diagram 3 above. I'm not sure if diagrams (1) or
(2) are common or exist?

The U300 pin controller is obviously of type (1) as it can spy on
the signals.

U300 HW might be diagram (1) - I can't say since I'm not familiar with
the HW. However, the fact that GPIO can spy on signals in no way at all
implies that the HW must conform to diagram (1).

That's true. And I don't know what it actually is in this case.
That hardware is actually weird in many ways, thanks to
helpful HW engineers modeling use cases into the HW.

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The Nomadik pin controller is basically type (2).

This I know however to be true, as I have access to the
low-level schematics of the ASIC.

Yours,
Linus Walleij