linux-kernel - Purpose of PCI address in ranges property

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Date:   Sun, 19 Mar 2017 19:44:48 +0530
From:   valmiki <valmikibow@...il.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Cc:     helgaas@...nel.org, marc.zyngier@....com, arnd@...db.de
Subject: Purpose of PCI address in ranges property

Hi,

When ranges property is being parsed using 
of_pci_get_host_bridge_resources, the pci address is being used for
calculating the offset for pci_add_resource_offset.

What is this offset for ?

So the cpu address is being used for programming memory base and limit 
registers ?

Thanks & Regards,
Valmiki