[net-next: PATCH v2 1/7] Documentation: ACPI: DSD: describe additional MAC configuration

[Marcin Wojtas <mw@semihalf.com>]

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>
---
 Documentation/firmware-guide/acpi/dsd/phy.rst | 55 ++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/Documentation/firmware-guide/acpi/dsd/phy.rst b/Documentation/firmware-guide/acpi/dsd/phy.rst
index 7d01ae8b3cc6..839710b94a7f 100644
--- a/Documentation/firmware-guide/acpi/dsd/phy.rst
+++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
@@ -49,6 +49,21 @@ 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 the 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
@@ -121,6 +136,44 @@ phy-mode and phy-handle are used as explained earlier.
 	  })
 	}
 
+MAC node example where "managed" property is specified.
+-------------------------------------------------------
+::
+	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.
+---------------------------------------------
+::
+	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
 ==========
 
@@ -131,3 +184,5 @@ 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
-- 
2.29.0