summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/bus/renesas,bsc.yaml
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/bus/renesas,bsc.yaml')
-rw-r--r--Documentation/devicetree/bindings/bus/renesas,bsc.yaml60
1 files changed, 60 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/bus/renesas,bsc.yaml b/Documentation/devicetree/bindings/bus/renesas,bsc.yaml
new file mode 100644
index 000000000000..7d10b62a52d5
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/renesas,bsc.yaml
@@ -0,0 +1,60 @@
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/renesas,bsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Bus State Controller (BSC)
+
+maintainers:
+ - Geert Uytterhoeven <geert+renesas@glider.be>
+
+description: |
+ The Renesas Bus State Controller (BSC, sometimes called "LBSC within Bus
+ Bridge", or "External Bus Interface") can be found in several Renesas ARM
+ SoCs. It provides an external bus for connecting multiple external
+ devices to the SoC, driving several chip select lines, for e.g. NOR
+ FLASH, Ethernet and USB.
+
+ While the BSC is a fairly simple memory-mapped bus, it may be part of a
+ PM domain, and may have a gateable functional clock. Before a device
+ connected to the BSC can be accessed, the PM domain containing the BSC
+ must be powered on, and the functional clock driving the BSC must be
+ enabled.
+
+ The bindings for the BSC extend the bindings for "simple-pm-bus".
+
+allOf:
+ - $ref: simple-pm-bus.yaml#
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - renesas,bsc-r8a73a4 # R-Mobile APE6 (r8a73a4)
+ - renesas,bsc-sh73a0 # SH-Mobile AG5 (sh73a0)
+ - const: renesas,bsc
+ - {} # simple-pm-bus, but not listed here to avoid false select
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+required:
+ - reg
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ bsc: bus@fec10000 {
+ compatible = "renesas,bsc-sh73a0", "renesas,bsc", "simple-pm-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0 0x20000000>;
+ reg = <0xfec10000 0x400>;
+ interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&zb_clk>;
+ power-domains = <&pd_a4s>;
+ };