linux-kernel - [PATCH v2 09/12] PCI: iproc: Add optional dma-ranges

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Date:   Mon, 31 Oct 2016 17:38:38 -0700
From:   Ray Jui <ray.jui@...adcom.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        Alex Barba <alex.barba@...adcom.com>,
        Oza Oza <oza.oza@...adcom.com>, Ray Jui <ray.jui@...adcom.com>
Subject: [PATCH v2 09/12] PCI: iproc: Add optional dma-ranges

Add description for optional device tree property 'dma-ranges' for
inbound mapping

Signed-off-by: Oza Oza <oza.oza@...adcom.com>
Signed-off-by: Ray Jui <ray.jui@...adcom.com>
Reviewed-by: Scott Branden <scott.branden@...adcom.com>
---
 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index f827b8d..62a0ab9 100644
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -25,6 +25,9 @@ Optional properties:
 - phys: phandle of the PCIe PHY device
 - phy-names: must be "pcie-phy"
 - dma-coherent: present if DMA operations are coherent
+- dma-ranges: Some PAXB based root complexes do not have inbound mapping done
+  by the ASIC after power on reset. In this case, SW is required to configure
+the mapping, based on inbound memory regions specified by this property
 
 - brcm,pcie-ob: Some iProc SoCs do not have the outbound address mapping done
 by the ASIC after power on reset. In this case, SW needs to configure it
-- 
2.1.4