[PATCH v2 5/7] dt-bindings: Amlogic: Add SMP related documentation

[Carlo Caione]

From: Carlo Caione <carlo at endlessm.com>

With this patch we add documentation for:

* power-management-unit: the PMU is used to bring up the cores during
  SMP operations
* sram: among other things the sram is used to store the first code
  executed by the core when it is powered up
* cpu-enable-method: the CPU enable method used by Amlogic Meson8b SoCs

Signed-off-by: Carlo Caione <carlo at endlessm.com>
---
 .../devicetree/bindings/arm/amlogic/pmu.txt        | 16 +++++++++++
 .../devicetree/bindings/arm/amlogic/smp-sram.txt   | 32 ++++++++++++++++++++++
 Documentation/devicetree/bindings/arm/cpus.txt     |  1 +
 3 files changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/amlogic/pmu.txt
 create mode 100644 Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt

diff --git a/Documentation/devicetree/bindings/arm/amlogic/pmu.txt b/Documentation/devicetree/bindings/arm/amlogic/pmu.txt
new file mode 100644
index 0000000..7b9b2da
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/amlogic/pmu.txt
@@ -0,0 +1,16 @@
+Amlogic power-management-unit:
+-------------------------------
+
+The pmu is used to turn off and on different power domains of the SoCs
+This includes the power to the CPU cores.
+
+Required node properties:
+- compatible value : = "amlogic,meson8b-pmu";
+- reg : physical base address and the size of the registers window
+
+Example:
+
+	pmu at c81000e4 {
+		compatible = "amlogic,meson8b-pmu", "syscon";
+		reg = <0xc81000e0 0x18>;
+	};
diff --git a/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt b/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt
new file mode 100644
index 0000000..455ca20
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt
@@ -0,0 +1,32 @@
+Amlogic SRAM for smp bringup:
+------------------------------
+
+Amlogic's smp-capable SoCs use part of the sram for the bringup of the cores.
+Once the core gets powered up it executes the code that is residing at a
+specific location.
+
+Therefore a reserved section sub-node has to be added to the mmio-sram
+declaration.
+
+Required sub-node properties:
+- compatible : should be "amlogic,meson8b-smp-sram"
+
+The rest of the properties should follow the generic mmio-sram discription
+found in ../../misc/sram.txt
+
+Example:
+
+	sram: sram at d9000000 {
+		compatible = "mmio-sram";
+		reg = <0xd9000000 0x20000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0xd9000000 0x20000>;
+
+		smp-sram at 1ff80 {
+			compatible = "amlogic,meson8b-smp-sram";
+			reg = <0x1ff80 0x8>;
+		};
+	};
+
+
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index 3a07a87..22381b4 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -189,6 +189,7 @@ nodes to be present and contain the properties described below.
 			  can be one of:
 			    "allwinner,sun6i-a31"
 			    "allwinner,sun8i-a23"
+			    "amlogic,meson8b-smp"
 			    "arm,psci"
 			    "brcm,brahma-b15"
 			    "marvell,armada-375-smp"
-- 
2.5.0