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

Heiko Stübner
2013-06-25T08:48:21Z

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@sntech.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@10080000 {
+ 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@10080000 {
+ compatible = "rockchip,rk3066-sram", "mmio-sram";
+ reg = <0x10080000 0x10000>;
+ mmio-sram-reserved = <0x0 0x50>;
+ };
+
gic: interrupt-controller@1013d000 {
compatible = "arm,cortex-a9-gic";
interrupt-controller;
--
1.7.10.4