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