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authorMarcin Wojtas <mw@semihalf.com>2021-06-21 20:30:23 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-22 19:54:54 +0300
commit7c4d7ca8cce3c8167e10f52a5afb553851f2086b (patch)
tree8f1e4945c9430281a8ed851032a1dc8bec810a8f /Documentation/firmware-guide
parent64295f0d01ae0661a2cea42c598070b1c87ca6e0 (diff)
downloadlinux-7c4d7ca8cce3c8167e10f52a5afb553851f2086b.tar.xz
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>
Diffstat (limited to 'Documentation/firmware-guide')
-rw-r--r--Documentation/firmware-guide/acpi/dsd/phy.rst59
1 files changed, 59 insertions, 0 deletions
diff --git a/Documentation/firmware-guide/acpi/dsd/phy.rst b/Documentation/firmware-guide/acpi/dsd/phy.rst
index 0d49bad2ea9c..680ad179e5f9 100644
--- a/Documentation/firmware-guide/acpi/dsd/phy.rst
+++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
@@ -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