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Subject[PATCH 00/14] net: axienet: Error handling, SGMII and 64-bit DMA fixes

this series updates the Xilinx Axienet driver to work on our board
here. One big issue was broken SGMII support, which patch 7 fixes.
While debugging and understanding the driver, I found several problems
in the error handling and cleanup paths, which patches 2-6 address.
Patch 8 paves the way for newer revisions of the IP, the following patch
adds mii-tool support, just for good measure.

The next four patches add support for 64-bit DMA. This is an integration
option on newer IP revisions (>= v7.1), and expects MSB bits in formerly
reserved registers. Without writing to those MSB registers, the state
machine won't trigger, so it's mandatory to access them, even if they
are zero. Patches 10 and 11 prepare the code by adding accessors, to
wrap this properly and keep it working on older IP revisions.
Patch 12 enables access to the MSB registers, by trying to write a
non-zero value to them and checking if that sticks. Older IP revisions
always read those registers as zero.

Patch 13 then adjusts the DMA mask, if it finds a "xlnx,addrwidth"
property in the DMA DT node. I did not manage to autodetect this actual
implemented DMA width, so we need to rely on a DT property. If this is
missing, it will fall back to the current default of 32 bit.
The final patch updates the DT binding documentation in this respect.

The Xilinx PG138 and PG021 documents (in versions 7.1 in both cases)
were used for this series.

Please have a look and comment!


Andre Przywara (14):
net: xilinx: temac: Relax Kconfig dependencies
net: axienet: Propagate failure of DMA descriptor setup
net: axienet: Fix DMA descriptor cleanup path
net: axienet: Improve DMA error handling
net: axienet: Factor out TX descriptor chain cleanup
net: axienet: Check for DMA mapping errors
net: axienet: Fix SGMII support
net: axienet: Drop MDIO interrupt registers from ethtools dump
net: axienet: Add mii-tool support
net: axienet: Wrap DMA pointer writes to prepare for 64 bit
net: axienet: Upgrade descriptors to hold 64-bit addresses
net: axienet: Autodetect 64-bit DMA capability
net: axienet: Allow DMA to beyond 4GB
net: axienet: Update devicetree binding documentation

.../bindings/net/xilinx_axienet.txt | 57 ++-
drivers/net/ethernet/xilinx/Kconfig | 1 -
drivers/net/ethernet/xilinx/xilinx_axienet.h | 10 +-
.../net/ethernet/xilinx/xilinx_axienet_main.c | 366 +++++++++++++-----
4 files changed, 328 insertions(+), 106 deletions(-)


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