1 %YAML 1.2
2 ---
3 $id: http://devicetree.org/schemas/bus/renesas,bsc.yaml#
4 $schema: http://devicetree.org/meta-schemas/core.yaml#
5
6 title: Renesas Bus State Controller (BSC)
7
8 maintainers:
9 - Geert Uytterhoeven <geert+renesas@glider.be>
10
11 description: |
12 The Renesas Bus State Controller (BSC, sometimes called "LBSC within Bus
13 Bridge", or "External Bus Interface") can be found in several Renesas ARM
14 SoCs. It provides an external bus for connecting multiple external
15 devices to the SoC, driving several chip select lines, for e.g. NOR
16 FLASH, Ethernet and USB.
17
18 While the BSC is a fairly simple memory-mapped bus, it may be part of a
19 PM domain, and may have a gateable functional clock. Before a device
20 connected to the BSC can be accessed, the PM domain containing the BSC
21 must be powered on, and the functional clock driving the BSC must be
22 enabled.
23
24 The bindings for the BSC extend the bindings for "simple-pm-bus".
25
26 allOf:
27 - $ref: simple-pm-bus.yaml#
28
29 properties:
30 compatible:
31 items:
32 - enum:
33 - renesas,bsc-r8a73a4 # R-Mobile APE6 (r8a73a4)
34 - renesas,bsc-sh73a0 # SH-Mobile AG5 (sh73a0)
35 - const: renesas,bsc
36 - {} # simple-pm-bus, but not listed here to avoid false select
37
38 reg:
39 maxItems: 1
40
41 interrupts:
42 maxItems: 1
43
44 required:
45 - reg
46
47 unevaluatedProperties: false
48
49 examples:
50 - |
51 #include <dt-bindings/interrupt-controller/irq.h>
52
53 bsc: bus@fec10000 {
54 compatible = "renesas,bsc-sh73a0", "renesas,bsc", "simple-pm-bus";
55 #address-cells = <1>;
56 #size-cells = <1>;
57 ranges = <0 0 0x20000000>;
58 reg = <0xfec10000 0x400>;
59 interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>;
60 clocks = <&zb_clk>;
61 power-domains = <&pd_a4s>;
62 };
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