linux-kernel - Re: [PATCH] PCI: keystone: update to support multiple pci ports

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Date:	Fri, 05 Sep 2014 21:00:19 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Kumar Gala <galak@...eaurora.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI: keystone: update to support multiple pci ports

On Friday 05 September 2014 14:33:54 Murali Karicheri wrote:
> > This looks like it's a shared register of some sort that doesn't
> > really belong into the registers of a particular port. Could it
> > be that it's actually for the PHY?
> >
> This a shared device configuration register between the two ports the 
> desciption states it is bootstrap configuration of the PCIe module as 
> Endpoint or Root complex and Not Phy. Hope below text will help.

Ok. Why do you want to have this user-selectable though? Can't it
just be set by the boot loader before starting Linux?

	Arnd

> Table 3-23 Device Configuration Register (DEVCFG)
> 
> 
> PCIESSMODE[1:0] 00b PCIESSMODE is used to control the
> functionality of PCIESS module out of
> reset. This MMR output is connected to
> DEVTYPE input of PCIESS
> (Changes from
> Nysh) : Note that in Nysh this value came
> from a bootstrap pin.
> 00 : Endpoint
> 01 : Legacy Endpoint
> 10 : Rootcomplex
> 11 : Reserved
> PCIESS_1_MODE[1:0
> ]
> 00b PCIESSMODE is used to control the
> functionality of PCIE_1 module out of
> reset. This MMR output is connected to
> DEVTYPE input of PCIE_1
> 00 : Endpoint
> 01 : Legacy Endpoint
> 10 : Rootcomplex
> 11 : Reserv
> 

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