From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: pci and pcie device-tree binding - range No cells Date: Mon, 10 Dec 2012 08:26:37 -0600 Message-ID: <50C5F11D.9060006@gmail.com> References: <50C5D387.90908@monstr.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <50C5D387.90908@monstr.eu> Sender: linux-pci-owner@vger.kernel.org To: monstr@monstr.eu Cc: devicetree-discuss@lists.ozlabs.org, Grant Likely , linux-pci@vger.kernel.org, Rob Herring , linuxppc-dev , Benjamin Herrenschmidt List-Id: devicetree@vger.kernel.org On 12/10/2012 06:20 AM, Michal Simek wrote: > Hi Grant and others, > > I have a question regarding number of cells in ranges property > for pci and pcie nodes. > > Linux pci/pcie powerpc DTSes contain 7 cells (xpedite5370.dts, > sequoia.dts, etc) > but also 6 cells format too (mpc832x_mds.dts) > > Here is shown 6 cells ranges format and describe > http://devicetree.org/Device_Tree_Usage#PCI_Host_Bridge > > And also in documentation in the linux > Documentation/devicetree/bindings/pci/83xx-512x-pci.txt > > Both format uses: > #size-cells = <2>; > #address-cells = <3>; > > What is valid format? Both. 7 cells are valid when the host (parent) bus is 64-bit and 6 cells are valid when the host bus is 32-bit. The ranges property is < >. The parent address #address-cells is taken from the parent node. Rob