| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | }; |