| Message ID | 20161202233238.17561-2-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On Sat, Dec 03, 2016 at 12:32:37AM +0100, Martin Blumenstingl wrote: > 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: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > Tested-by: Neil Armstrong <narmstrong@baylibre.com> > --- > Documentation/devicetree/bindings/net/meson-dwmac.txt | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) Acked-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt index 89e62dd..f8bc540 100644 --- a/Documentation/devicetree/bindings/net/meson-dwmac.txt +++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt @@ -25,6 +25,20 @@ 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. + This must be configured when the phy-mode is + "rgmii" (typically a value of 2ns is used in + this case). + When phy-mode is set to "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). Example for Meson6: