54 lines
1.7 KiB
Plaintext
54 lines
1.7 KiB
Plaintext
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Driver for ARM AXI Bus with Broadcom Plugins (bcma)
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Required properties:
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- compatible : brcm,bus-axi
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- reg : iomem address range of chipcommon core
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The cores on the AXI bus are automatically detected by bcma with the
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memory ranges they are using and they get registered afterwards.
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Automatic detection of the IRQ number is not working on
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BCM47xx/BCM53xx ARM SoCs. To assign IRQ numbers to the cores, provide
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them manually through device tree. Use an interrupt-map to specify the
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IRQ used by the devices on the bus. The first address is just an index,
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because we do not have any special register.
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The top-level axi bus may contain children representing attached cores
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(devices). This is needed since some hardware details can't be auto
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detected (e.g. IRQ numbers). Also some of the cores may be responsible
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for extra things, e.g. ChipCommon providing access to the GPIO chip.
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Example:
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axi@18000000 {
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compatible = "brcm,bus-axi";
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reg = <0x18000000 0x1000>;
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ranges = <0x00000000 0x18000000 0x00100000>;
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#address-cells = <1>;
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#size-cells = <1>;
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#interrupt-cells = <1>;
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interrupt-map-mask = <0x000fffff 0xffff>;
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interrupt-map =
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/* Ethernet Controller 0 */
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<0x00024000 0 &gic GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
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/* Ethernet Controller 1 */
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<0x00025000 0 &gic GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
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/* PCIe Controller 0 */
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<0x00012000 0 &gic GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>,
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<0x00012000 1 &gic GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>,
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<0x00012000 2 &gic GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>,
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<0x00012000 3 &gic GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>,
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<0x00012000 4 &gic GIC_SPI 130 IRQ_TYPE_LEVEL_HIGH>,
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<0x00012000 5 &gic GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>;
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chipcommon {
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reg = <0x00000000 0x1000>;
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gpio-controller;
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#gpio-cells = <2>;
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};
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};
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