devicetree: bindings: Renesas APMU and SMP Enable method

Add DT binding documentation for the APMU hardware and add "renesas,apmu"
to the list of enable methods for the ARM cpus.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index 3f0cbbb8395f84ef1bc1cba898854d386f236b53..fa7520eb6387edbe2e27ffa723522ceaabbea55a 100644 (file)
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -204,6 +204,7 @@ nodes to be present and contain the properties described below.
                            "qcom,gcc-msm8660"
                            "qcom,kpss-acc-v1"
                            "qcom,kpss-acc-v2"
+                           "renesas,apmu"
                            "rockchip,rk3036-smp"
                            "rockchip,rk3066-smp"
                            "ste,dbx500-smp"

diff --git a/Documentation/devicetree/bindings/power/renesas,apmu.txt b/Documentation/devicetree/bindings/power/renesas,apmu.txt
new file mode 100644 (file)
index 0000000..84404c9
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/renesas,apmu.txt
@@ -0,0 +1,31 @@
+DT bindings for the Renesas Advanced Power Management Unit
+
+Renesas R-Car line of SoCs utilize one or more APMU hardware units
+for CPU core power domain control including SMP boot and CPU Hotplug.
+
+Required properties:
+
+- compatible: Should be "renesas,<soctype>-apmu", "renesas,apmu" as fallback.
+             Examples with soctypes are:
+               - "renesas,r8a7790-apmu" (R-Car H2)
+               - "renesas,r8a7791-apmu" (R-Car M2-W)
+               - "renesas,r8a7792-apmu" (R-Car V2H)
+               - "renesas,r8a7793-apmu" (R-Car M2-N)
+               - "renesas,r8a7794-apmu" (R-Car E2)
+
+- reg: Base address and length of the I/O registers used by the APMU.
+
+- cpus: This node contains a list of CPU cores, which should match the order
+  of CPU cores used by the WUPCR and PSTR registers in the Advanced Power
+  Management Unit section of the device's datasheet.
+
+
+Example:
+
+This shows the r8a7791 APMU that can control CPU0 and CPU1.
+
+       apmu@e6152000 {
+               compatible = "renesas,r8a7791-apmu", "renesas,apmu";
+               reg = <0 0xe6152000 0 0x188>;
+               cpus = <&cpu0 &cpu1>;
+       };