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Documentation: ACPI: DSD: describe additional MAC configuration 

Document additional MAC configuration modes which can be processed
by the existing fwnode_ phylink helpers:

* "managed" standard ACPI _DSD property [1]
* "fixed-link" data-only subnode linked in the _DSD package via
  generic mechanism of the hierarchical data extension [2]

[1] https://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf
[2] https://github.com/UEFI/DSD-Guide/blob/main/dsd-guide.pdf

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcin Wojtas 2021-06-21 19:30:23 +02:00 committed by David S. Miller
parent 64295f0d01
commit 7c4d7ca8cc
1 changed files with 59 additions and 0 deletions
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59
Documentation/firmware-guide/acpi/dsd/phy.rst
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@ -50,6 +50,21 @@ phy-mode
The "phy-mode" _DSD property is used to describe the connection to
the PHY. The valid values for "phy-mode" are defined in [4].
managed
-------
Optional property, which specifies the PHY management type.
The valid values for "managed" are defined in [4].
fixed-link
----------
The "fixed-link" is described by a data-only subnode of the
MAC port, which is linked in the _DSD package via
hierarchical data extension (UUID dbb8e3e6-5886-4ba6-8795-1319f52a966b
in accordance with [5] "_DSD Implementation Guide" document).
The subnode should comprise a required property ("speed") and
possibly the optional ones - complete list of parameters and
their values are specified in [4].
The following ASL example illustrates the usage of these properties.
DSDT entry for MDIO node
@ -128,6 +143,48 @@ phy-mode and phy-handle are used as explained earlier.
})
}
MAC node example where "managed" property is specified.
-------------------------------------------------------
.. code-block:: none
Scope(\_SB.PP21.ETH0)
{
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {"phy-mode", "sgmii"},
Package () {"managed", "in-band-status"}
}
})
}
MAC node example with a "fixed-link" subnode.
---------------------------------------------
.. code-block:: none
Scope(\_SB.PP21.ETH1)
{
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {"phy-mode", "sgmii"},
},
ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
Package () {
Package () {"fixed-link", "LNK0"}
}
})
Name (LNK0, Package(){ // Data-only subnode of port
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {"speed", 1000},
Package () {"full-duplex", 1}
}
})
}
References
==========
@ -138,3 +195,5 @@ References
[3] Documentation/firmware-guide/acpi/DSD-properties-rules.rst
[4] Documentation/devicetree/bindings/net/ethernet-controller.yaml
[5] https://github.com/UEFI/DSD-Guide/blob/main/dsd-guide.pdf