From mboxrd@z Thu Jan 1 00:00:00 1970 From: sunil.kovvuri@gmail.com (Sunil Kovvuri) Date: Wed, 24 Sep 2014 23:34:04 +0530 Subject: [PATCH 3/6] pci, thunder: Add PCIe host controller devicetree bindings In-Reply-To: <3082935.e3X4GsVUDn@wuerfel> References: <1411573068-12952-1-git-send-email-rric@kernel.org> <1411573068-12952-4-git-send-email-rric@kernel.org> <3082935.e3X4GsVUDn@wuerfel> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, Sep 24, 2014 at 9:36 PM, Arnd Bergmann wrote: > On Wednesday 24 September 2014 17:37:45 Robert Richter wrote: >> >> + pcie0 at 0x8480,00000000 { > > The name should be pci, not pci0. Thanks, will change. > >> + compatible = "cavium,thunder-pcie"; >> + device_type = "pci"; >> + msi-parent = <&its>; >> + bus-range = <0 255>; >> + #size-cells = <2>; >> + #address-cells = <3>; >> + reg = <0x8480 0x00000000 0 0x10000000>; /* Configuration space */ >> + ranges = <0x03000000 0x8010 0x00000000 0x8010 0x00000000 0x70 0x00000000>, /* mem ranges */ >> + <0x03000000 0x8300 0x00000000 0x8300 0x00000000 0x80 0x00000000>, >> + <0x03000000 0x87e0 0x00000000 0x87e0 0x00000000 0x01 0x00000000>; >> + }; > > If you claim the entire 0-255 bus range, I think you should also > specify a domain, otherwise it's not predictable which domain you > get. > > The interrupt-map and interrupt-map-mask properties are required for PCI, > otherwise you can't do LSI interrupts. This PCI controller supports only MSIx interrupts which are edge triggered. > > If your hardware can support it, you should also list I/O space and prefetchable > memory spaces. Can you explain why you have multiple non-prefetchable ranges? Our hardware is an ECAM based host controller and doesn't support I/O and prefetchable memory spaces. All on-board PCI devices connected to this PCI controller have fixed resources and doesn't have to be allocated/reassigned. Some of these devices are SRIOV based. Kernel's SRIOV (pci/iov.c) is expecting 'resource->parent' hierarchy to be set, otherwise doesn't enable SRIOV device. So, here multiple non-prefetchable ranges of root bus aid in resource claiming and setting res->parent hierarchy. We do call "pci_claim_resource" in controller driver code. "[PATCH 1/6] pci, thunder: Add support for Thunder PCIe host controller." > > Arnd > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html