From: Carlo Caione <carlo@xxxxxxxxxxxx>
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 Meson8 and
Meson8b SoCs
Signed-off-by: Carlo Caione <carlo@xxxxxxxxxxxx>
[also add Meson8 to the documentation]
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
.../devicetree/bindings/arm/amlogic/pmu.txt | 18 ++++++++++++
.../devicetree/bindings/arm/amlogic/smp-sram.txt | 32 ++++++++++++++++++++++
Documentation/devicetree/bindings/arm/cpus.txt | 2 ++
3 files changed, 52 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 000000000000..72f8d08198b6
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/amlogic/pmu.txt
@@ -0,0 +1,18 @@
+Amlogic Meson8 and Meson8b 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 : depending on the SoC this should be one of:
+ "amlogic,meson8-pmu"
+ "amlogic,meson8b-pmu"
+- reg : physical base address and the size of the registers window
+
+Example:
+
+ pmu@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 000000000000..3473ddaadfac
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt
@@ -0,0 +1,32 @@
+Amlogic Meson8 and Meson8b 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 : depending on the SoC this should be one of:
+ "amlogic,meson8-smp-sram"
+ "amlogic,meson8b-smp-sram"
+
+The rest of the properties should follow the generic mmio-sram discription
+found in ../../misc/sram.txt
+
+Example:
+
+ sram: sram@d9000000 {
+ compatible = "mmio-sram";
+ reg = <0xd9000000 0x20000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0xd9000000 0x20000>;
+
+ smp-sram@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 a44253cad269..1ef3e53b9be7 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -197,6 +197,8 @@ described below.
"actions,s500-smp"
"allwinner,sun6i-a31"
"allwinner,sun8i-a23"
+ "amlogic,meson8-smp"
+ "amlogic,meson8b-smp"
"arm,realview-smp"
"brcm,bcm11351-cpu-method"
"brcm,bcm23550"
--
2.14.1
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