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Commit d5490f1f authored by Martin Blumenstingl's avatar Martin Blumenstingl Committed by David S. Miller
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net: dt-bindings: add RGMII TX delay configuration to meson8b-dwmac 



This allows configuring the RGMII TX clock delay. The RGMII clock is
generated by underlying hardware of the the Meson 8b / GXBB DWMAC glue.
The configuration depends on the actual hardware (no delay may be
needed due to the design of the actual circuit, the PHY might add this
delay, etc.).

Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 23e3d618

Documentation/devicetree/bindings/net/meson-dwmac.txt

+16 −0
Original line number Diff line number Diff line
@@ -25,6 +25,22 @@ Required properties on Meson8b and newer: 
		- "clkin0" - first parent clock of the internal mux

		- "clkin1" - second parent clock of the internal mux



Optional properties on Meson8b and newer:

- amlogic,tx-delay-ns:	The internal RGMII TX clock delay (provided

			by this driver) in nanoseconds. Allowed values

			are: 0ns, 2ns, 4ns, 6ns.

			When phy-mode is set to "rgmii" then the TX

			delay should be explicitly configured. When

			not configured a fallback of 2ns is used.

			When the phy-mode is set to either "rgmii-id"

			or "rgmii-txid" the TX clock delay is already

			provided by the PHY. In that case this

			property should be set to 0ns (which disables

			the TX clock delay in the MAC to prevent the

			clock from going off because both PHY and MAC

			are adding a delay).

			Any configuration is ignored when the phy-mode

			is set to "rmii".



Example for Meson6: