linux-kernel - [PATCH v2 4/6] ARM: rockchip: add sram dt nodes and documentation

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Date:	Tue, 25 Jun 2013 10:48:07 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robherring2@...il.com>,
	devicetree-discuss@...ts.ozlabs.org,
	Russell King <linux@....linux.org.uk>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel@...r.kernel.org,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH v2 4/6] ARM: rockchip: add sram dt nodes and documentation

The Rockchip SoCs need a special part of their sram for bringup
of additional cores. Therefore also add a reserved section when adding the
mmio-sram node to keep the sram driver from using this space.

Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 .../devicetree/bindings/arm/rockchip/smp-sram.txt  |   23 ++++++++++++++++++++
 arch/arm/boot/dts/rk3066a.dtsi                     |    6 +++++
 2 files changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt

diff --git a/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt b/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt
new file mode 100644
index 0000000..80c878e
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt
@@ -0,0 +1,23 @@
+Rockchip SRAM for smp bringup:
+------------------------------
+
+Rockchip's smp-capable SoCs use the first part of the sram for the bringup
+of the cores. Once the core gets powered up it executes the code that is
+residing at the very beginning of the sram.
+
+Therefore a reserved section has to be added to the mmio-sram declaration.
+
+Required node properties:
+- compatible : should contain both "rockchip,rk3066-sram", "mmio-sram"
+  so that the smp code can select the correct sram node.
+
+The rest of the properties should follow the generic mmio-sram discription
+found in ../../misc/sram.txt
+
+Example:
+
+	sram: sram@...80000 {
+		compatible = "rockchip,rk3066-sram", "mmio-sram";
+		reg = <0x10080000 0x10000>;
+		mmio-sram-reserved = <0x0 0x50>;
+	};
diff --git a/arch/arm/boot/dts/rk3066a.dtsi b/arch/arm/boot/dts/rk3066a.dtsi
index 26c4311..24d1941 100644
--- a/arch/arm/boot/dts/rk3066a.dtsi
+++ b/arch/arm/boot/dts/rk3066a.dtsi
@@ -53,6 +53,12 @@
 			reg = <0x1013c000 0x100>;
 		};
 
+		sram: sram@...80000 {
+			compatible = "rockchip,rk3066-sram", "mmio-sram";
+			reg = <0x10080000 0x10000>;
+			mmio-sram-reserved = <0x0 0x50>;
+		};
+
 		gic: interrupt-controller@...3d000 {
 			compatible = "arm,cortex-a9-gic";
 			interrupt-controller;
-- 
1.7.10.4

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