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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2022-08-18 14:54:52 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-08-23 03:45:45 +0300 |
| commit | b975b73425cde436f3e66e4cd992f6e6fb0998e5 (patch) | |
| tree | 037e38a9554e42f3a13aec37da858ebcd19ddd42 /Documentation | |
| parent | b237676039d9f5f3a2a75bc258c3723940f697df (diff) | |
| download | linux-b975b73425cde436f3e66e4cd992f6e6fb0998e5.tar.xz | |
dt-bindings: net: dsa: hellcreek: add missing CPU port phy-mode/fixed-link to example
Looking at hellcreek_phylink_get_caps(), I see that depending on whether
is_100_mbits is set, speeds of 1G or of 100M will be advertised. The
de1soc_r1_pdata sets is_100_mbits to true.
The PHY modes declared in the capabilities are MII, RGMII and GMII. GMII
doesn't support 100Mbps, and as for RGMII, it would be a bit implausible
to me to support this PHY mode but limit it to only 25 MHz. So I've
settled on MII as a phy-mode in the example, and a fixed-link of
100Mbps.
As a side note, there exists such a thing as "rev-mii", because the MII
protocol is asymmetric, and "mii" is the designation for the MAC side
(expected to be connected to a PHY), and "rev-mii" is the designation
for the PHY side (expected to be connected to a MAC). I wonder whether
"mii" or "rev-mii" should actually be used here, since this is a CPU
port and presumably connected to another MAC.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/net/dsa/hirschmann,hellcreek.yaml | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/dsa/hirschmann,hellcreek.yaml b/Documentation/devicetree/bindings/net/dsa/hirschmann,hellcreek.yaml index 228683773151..1ff44dd68a61 100644 --- a/Documentation/devicetree/bindings/net/dsa/hirschmann,hellcreek.yaml +++ b/Documentation/devicetree/bindings/net/dsa/hirschmann,hellcreek.yaml @@ -93,6 +93,12 @@ examples: reg = <0>; label = "cpu"; ethernet = <&gmac0>; + phy-mode = "mii"; + + fixed-link { + speed = <100>; + full-duplex; + }; }; port@2 { |