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The Cavium Thunder SoCs have multiple MIDO buses that are part of a single PCI device. To model this in the device tree we call the PCI parent device a "cavium,thunder-8890-mdio-nexus", it has several children, one for each MDIO bus. The MDIO bus hardware is identical to that found in the OCTEON SoCs, so we use that code for things that are not part of the PCI driver probe/remove Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
85 lines
2.4 KiB
Plaintext
85 lines
2.4 KiB
Plaintext
* System Management Interface (SMI) / MDIO
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Properties:
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- compatible: One of:
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"cavium,octeon-3860-mdio": Compatibility with all cn3XXX, cn5XXX
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and cn6XXX SOCs.
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"cavium,thunder-8890-mdio": Compatibility with all cn8XXX SOCs.
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- reg: The base address of the MDIO bus controller register bank.
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- #address-cells: Must be <1>.
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- #size-cells: Must be <0>. MDIO addresses have no size component.
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Typically an MDIO bus might have several children.
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Example:
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mdio@1180000001800 {
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compatible = "cavium,octeon-3860-mdio";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x11800 0x00001800 0x0 0x40>;
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ethernet-phy@0 {
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...
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reg = <0>;
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};
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};
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* System Management Interface (SMI) / MDIO Nexus
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Several mdio buses may be gathered as children of a single PCI
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device, this PCI device is the nexus of the buses.
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Properties:
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- compatible: "cavium,thunder-8890-mdio-nexus";
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- reg: The PCI device and function numbers of the nexus device.
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- #address-cells: Must be <2>.
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- #size-cells: Must be <2>.
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- ranges: As needed for mapping of the MDIO bus device registers.
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- assigned-addresses: As needed for mapping of the MDIO bus device registers.
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Example:
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mdio-nexus@1,3 {
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compatible = "cavium,thunder-8890-mdio-nexus";
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#address-cells = <2>;
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#size-cells = <2>;
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reg = <0x0b00 0 0 0 0>; /* DEVFN = 0x0b (1:3) */
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assigned-addresses = <0x03000000 0x87e0 0x05000000 0x0 0x800000>;
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ranges = <0x87e0 0x05000000 0x03000000 0x87e0 0x05000000 0x0 0x800000>;
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mdio0@87e0,05003800 {
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compatible = "cavium,thunder-8890-mdio";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x87e0 0x05003800 0x0 0x30>;
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ethernet-phy@0 {
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...
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reg = <0>;
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};
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};
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mdio0@87e0,05003880 {
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compatible = "cavium,thunder-8890-mdio";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x87e0 0x05003880 0x0 0x30>;
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ethernet-phy@0 {
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...
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reg = <0>;
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};
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};
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};
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