[PATCH 0/3] ARM64: meson: Meson8b and GXBB DWMAC glue driver

Martin Blumenstingl
2016-08-15T16:41:20Z

This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
the register layout is completely different.
Thus I introduced a separate driver.

Changes compared to the RFC version:
- switch from syscon / regmap to assigning the corresponding register
region directly to the driver (like meson6-dwmac does it)
- dropped "fix_mac_speed" callback since the reference driver does not
implement it (I could not test if it is required due to lack of
hardware)
- switch to common clock framework now that we know what bits 5:4
(mux clock), 6:5 (250MHz divider) and 10 (configurable 5 or 10
divider) are used for
- Removed dts property "amlogic,mp2-clock" because it is now part of
the clocks which are registered by the glue driver
- Removed dts properties "amlogic,enable-tx-phy-ref-clk" and
"amlogic,tx-delay" because it seems we can guess them based on the
phy-mode (the original Amlogic dts files only supply two different
values: one value for the internal RMII PHY and another one for the
external RGMII Gbit PHY).
If required we can extend the code in the future to make these
configurable.
- This means that the only Meson8b / GXBB specific part of the binding
is the clkin0 (FCLK_DIV2) clock, as it's needed for the mux clock.
Everything else is auto-detected based on the phy-mode (which is
already mandatory in stmmac).

I have successfully tested this on a Vega S95 Meta clone which comes
with a "broken" bootloader (which programs the ethernet registers to
"Fast Ethernet / RGMII" mode, while the board has a Realtek Gbit PHY).
Before this series stmmac was detected, I got a network interface but
no traffic was flowing.

Due to lack of hardware I could not test this on a device which uses
the internal RMII (Fast Ethernet) PHY.

Martin Blumenstingl (3):
net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings
net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC
ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

.../devicetree/bindings/net/meson-dwmac.txt | 43 ++-
arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 7 +-
drivers/net/ethernet/stmicro/stmmac/Makefile | 2 +-
.../net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 327 +++++++++++++++++++++
4 files changed, 367 insertions(+), 12 deletions(-)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

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