GPIO configuration on 460EX

Hi,

I'm looking at GPIO setup code for Canyonlands, and it looks like some initializations mentioned in the 460EX manual are missing. When pin is configured as alternate input, the corresponding bits in TSRL/H registers should be set. U-Boot code sets TSRL/H registers only for output pins.

Am I missing something ?

Thanks a lot.

Felix.

Hi Felix,

Looking again at the users manual I can't find that the TSR register should be set for input functionality. Take a look at figure 35-1. Here you will see that TSR is only involved for output functionality.

I assume that you are asking because of your Linux IRQ problem with the external interrupt, correct? I'll take a look at the Linux thread and try to give another answer there.

And feel free to test with TSR configured for input as well. If this gets your interrupt working then this we need to change this GPIO config code of course.

Best regards,
Stefan

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Hi, Stefan

I was looking at section 35.5.3 and Table 35-9 in user manual (Version 1.14) TSR is involved in both input and output functionality. This indeed contradicts
the description you were referring to. Maybe AMCC guys reading this list can clarify ?

Thanks a lot. Your suggestion in this thread indeed helped. I was using wrong IRQ number in device tree.

I've tried that, but it didn't help.

Thanks a lot for you help.

Felix.