linux-kernel - [PATCH AUTOSEL 4.4 3/7] ARM: dts: dra7: Add "dma-ranges" property to PCIe RC DT nodes

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Date:   Sun, 15 Mar 2020 22:35:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <sashal@...nel.org>, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 3/7] ARM: dts: dra7: Add "dma-ranges" property to PCIe RC DT nodes

From: Kishon Vijay Abraham I <kishon@...com>

[ Upstream commit 27f13774654ea6bd0b6fc9b97cce8d19e5735661 ]

'dma-ranges' in a PCI bridge node does correctly set dma masks for PCI
devices not described in the DT. Certain DRA7 platforms (e.g., DRA76)
has RAM above 32-bit boundary (accessible with LPAE config) though the
PCIe bridge will be able to access only 32-bits. Add 'dma-ranges'
property in PCIe RC DT nodes to indicate the host bridge can access
only 32 bits.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/boot/dts/dra7.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index e6a3a94bac693..2cdaa38c114e8 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -227,6 +227,7 @@
 				device_type = "pci";
 				ranges = <0x81000000 0 0          0x03000 0 0x00010000
 					  0x82000000 0 0x20013000 0x13000 0 0xffed000>;
+				dma-ranges = <0x02000000 0x0 0x00000000 0x00000000 0x1 0x00000000>;
 				bus-range = <0x00 0xff>;
 				#interrupt-cells = <1>;
 				num-lanes = <1>;
@@ -263,6 +264,7 @@
 				device_type = "pci";
 				ranges = <0x81000000 0 0          0x03000 0 0x00010000
 					  0x82000000 0 0x30013000 0x13000 0 0xffed000>;
+				dma-ranges = <0x02000000 0x0 0x00000000 0x00000000 0x1 0x00000000>;
 				bus-range = <0x00 0xff>;
 				#interrupt-cells = <1>;
 				num-lanes = <1>;
-- 
2.20.1