summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/devicetree/bindings/memory-controllers/renesas-memory-controllers.txt
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/Documentation/devicetree/bindings/memory-controllers/renesas-memory-controllers.txt')
-rw-r--r--kernel/Documentation/devicetree/bindings/memory-controllers/renesas-memory-controllers.txt44
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/memory-controllers/renesas-memory-controllers.txt b/kernel/Documentation/devicetree/bindings/memory-controllers/renesas-memory-controllers.txt
new file mode 100644
index 000000000..c64b7925c
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/memory-controllers/renesas-memory-controllers.txt
@@ -0,0 +1,44 @@
+DT bindings for Renesas R-Mobile and SH-Mobile memory controllers
+=================================================================
+
+Renesas R-Mobile and SH-Mobile SoCs contain one or more memory controllers.
+These memory controllers differ from one SoC variant to another, and are called
+by different names ("DDR Bus Controller (DBSC)", "DDR3 Bus State Controller
+(DBSC3)", "SDRAM Bus State Controller (SBSC)").
+
+Currently memory controller device nodes are used only to reference PM
+domains, and prevent these PM domains from being powered down, which would
+crash the system.
+
+As there exist no actual drivers for these controllers yet, these bindings
+should be considered EXPERIMENTAL for now.
+
+Required properties:
+ - compatible: Must be one of the following SoC-specific values:
+ - "renesas,dbsc-r8a73a4" (R-Mobile APE6)
+ - "renesas,dbsc3-r8a7740" (R-Mobile A1)
+ - "renesas,sbsc-sh73a0" (SH-Mobile AG5)
+ - reg: Must contain the base address and length of the memory controller's
+ registers.
+
+Optional properties:
+ - interrupts: Must contain a list of interrupt specifiers for memory
+ controller interrupts, if available.
+ - interrupts-names: Must contain a list of interrupt names corresponding to
+ the interrupts in the interrupts property, if available.
+ Valid interrupt names are:
+ - "sec" (secure interrupt)
+ - "temp" (normal (temperature) interrupt)
+ - power-domains: Must contain a reference to the PM domain that the memory
+ controller belongs to, if available.
+
+Example:
+
+ sbsc1: memory-controller@fe400000 {
+ compatible = "renesas,sbsc-sh73a0";
+ reg = <0xfe400000 0x400>;
+ interrupts = <0 35 IRQ_TYPE_LEVEL_HIGH>,
+ <0 36 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "sec", "temp";
+ power-domains = <&pd_a4bc0>;
+ };