From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Arend van Spriel <arend@broadcom.com>, Mark Rutland <mark.rutland@arm.com>,
        devicetree@vger.kernel.org, Florian Fainelli <f.fainelli@gmail.com>,
        Russell King <linux@arm.linux.org.uk>,
        Scott Branden <sbranden@broadcom.com>, Pawel Moll <pawel.moll@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Ray Jui <rjui@broadcom.com>, Christian Daudt <bcm@fixthebug.org>,
        linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
        Matt Porter <mporter@linaro.org>,
        Grant Likely <grant.likely@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        bcm-kernel-feedback-list@broadcom.com,
        Hauke Mehrtens <hauke@hauke-m.de>, Kumar Gala <galak@codeaurora.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lucas Stach <l.stach@pengutronix.de>
Subject: Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding
Date: Sat, 13 Dec 2014 20:46:42 +0100
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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.

	Arnd
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