Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

From: Arnd Bergmann
Date: Sat Dec 13 2014 - 14:48:08 EST

On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
> Makes sense. I think that is what Hauke meant by "adding
> additional support for registering to bcma". So the discovery info is a
> piece of read-only memory in the chip. Its address is stored in the
> chipcommon core register space. BCMA parses that memory blob resulting
> in a list of cores which register address info. We could add DT support
> in BCMA matching the compatible string and register a core for it.

Ah, interesting idea. That would mirror what we do for drivers/amba,
I like the idea.

> However, apart from the discovery info a "discoverable ARM AXI" chip has
> a register space per core that provides common procedures like
> enable/disable, reset, core status, which are implemented in BCMA. I am
> not seeing that register space in the DT examples so I guess this IP
> block is not there for iProc chips.

I wouldn't draw conclusions from the absence of some node. Maybe these
registers are present but just not used by the original BSP.

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