summaryrefslogtreecommitdiffstats
path: root/Documentation
diff options
context:
space:
mode:
authorKukjin Kim <kgene.kim@samsung.com>2013-03-09 16:56:34 +0900
committerKukjin Kim <kgene.kim@samsung.com>2013-03-09 16:56:34 +0900
commit8ec46b97f24d60645c8f708c87e0caecebd25d77 (patch)
tree3663c411f7a4e7a9bfc0a8e720679b93a5860b7c /Documentation
parentb85b64cc22122adca695e0f8c340cc677ad92e8c (diff)
parent6938d75a8c1a1752f9fa7ef14a0c570036c7b73b (diff)
downloadlinux-8ec46b97f24d60645c8f708c87e0caecebd25d77.tar.gz
linux-8ec46b97f24d60645c8f708c87e0caecebd25d77.tar.bz2
linux-8ec46b97f24d60645c8f708c87e0caecebd25d77.zip
Merge branch 'next/mct-exynos' into next/clk-exynos
Conflicts: arch/arm/mach-exynos/mach-exynos4-dt.c
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt68
1 files changed, 68 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
new file mode 100644
index 000000000000..cb47bfbcaeea
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
@@ -0,0 +1,68 @@
+Samsung's Multi Core Timer (MCT)
+
+The Samsung's Multi Core Timer (MCT) module includes two main blocks, the
+global timer and CPU local timers. The global timer is a 64-bit free running
+up-counter and can generate 4 interrupts when the counter reaches one of the
+four preset counter values. The CPU local timers are 32-bit free running
+down-counters and generate an interrupt when the counter expires. There is
+one CPU local timer instantiated in MCT for every CPU in the system.
+
+Required properties:
+
+- compatible: should be "samsung,exynos4210-mct".
+ (a) "samsung,exynos4210-mct", for mct compatible with Exynos4210 mct.
+ (b) "samsung,exynos4412-mct", for mct compatible with Exynos4412 mct.
+
+- reg: base address of the mct controller and length of the address space
+ it occupies.
+
+- interrupts: the list of interrupts generated by the controller. The following
+ should be the order of the interrupts specified. The local timer interrupts
+ should be specified after the four global timer interrupts have been
+ specified.
+
+ 0: Global Timer Interrupt 0
+ 1: Global Timer Interrupt 1
+ 2: Global Timer Interrupt 2
+ 3: Global Timer Interrupt 3
+ 4: Local Timer Interrupt 0
+ 5: Local Timer Interrupt 1
+ 6: ..
+ 7: ..
+ i: Local Timer Interrupt n
+
+Example 1: In this example, the system uses only the first global timer
+ interrupt generated by MCT and the remaining three global timer
+ interrupts are unused. Two local timer interrupts have been
+ specified.
+
+ mct@10050000 {
+ compatible = "samsung,exynos4210-mct";
+ reg = <0x10050000 0x800>;
+ interrupts = <0 57 0>, <0 0 0>, <0 0 0>, <0 0 0>,
+ <0 42 0>, <0 48 0>;
+ };
+
+Example 2: In this example, the MCT global and local timer interrupts are
+ connected to two seperate interrupt controllers. Hence, an
+ interrupt-map is created to map the interrupts to the respective
+ interrupt controllers.
+
+ mct@101C0000 {
+ compatible = "samsung,exynos4210-mct";
+ reg = <0x101C0000 0x800>;
+ interrupt-controller;
+ #interrups-cells = <2>;
+ interrupt-parent = <&mct_map>;
+ interrupts = <0 0>, <1 0>, <2 0>, <3 0>,
+ <4 0>, <5 0>;
+
+ mct_map: mct-map {
+ #interrupt-cells = <2>;
+ #address-cells = <0>;
+ #size-cells = <0>;
+ interrupt-map = <0x0 0 &combiner 23 3>,
+ <0x4 0 &gic 0 120 0>,
+ <0x5 0 &gic 0 121 0>;
+ };
+ };