[PATCH V4 00/19] net: ks8851: Unify KS8851 SPI and MLL drivers

[Marek Vasut <marex@denx.de>]

The KS8851SNL/SNLI and KS8851-16MLL/MLLI/MLLU are very much the same pieces
of silicon, except the former has an SPI interface, while the later has a
parallel bus interface. Thus far, Linux has two separate drivers for each
and they are diverging considerably.

This series unifies them into a single driver with small SPI and parallel
bus specific parts. The approach here is to first separate out the SPI
specific parts into a separate file, then add parallel bus accessors in
another separate file and then finally remove the old parallel bus driver.
The reason for replacing the old parallel bus driver is because the SPI
bus driver is much higher quality.

NOTE: The performance regression on KS8851-16MLL is now fixed, the TX
      throughput is back to ~75 Mbit/s , RX is still 50 Mbit/s .

NOTE: The V4 is now tested on RPi3B with KSZ8851SNL DEMO Board at 25 MHz.
      The "ping -c 1000 -i 0.01" latency test is fluctuating around
      		rtt min/avg/max/mdev = 1.448/1.540/1.699/0.030 ms
      either way, with or without this series. The following chunk was
      added to arch/arm/boot/dts/bcm2837-rpi-3-b.dts to bind the KSZ8851SNL
      on the RPi3B:
		&spi {
			status = "okay";
			cs-gpios = <&gpio 8 1>;
			pinctrl-names = "default";
			pinctrl-0 = <&spi0_gpio7>;

			ks8851@0 {
				compatible = "ks8851";
				spi-max-frequency = <25000000>;
				reg = <0>;
				interrupt-parent = <&gpio>;
				interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
			};
		};

Marek Vasut (19):
  net: ks8851: Factor out spi->dev in probe()/remove()
  net: ks8851: Rename ndev to netdev in probe
  net: ks8851: Replace dev_err() with netdev_err() in IRQ handler
  net: ks8851: Pass device node into ks8851_init_mac()
  net: ks8851: Use devm_alloc_etherdev()
  net: ks8851: Use dev_{get,set}_drvdata()
  net: ks8851: Remove ks8851_rdreg32()
  net: ks8851: Use 16-bit writes to program MAC address
  net: ks8851: Use 16-bit read of RXFC register
  net: ks8851: Factor out bus lock handling
  net: ks8851: Factor out SKB receive function
  net: ks8851: Split out SPI specific entries in struct ks8851_net
  net: ks8851: Split out SPI specific code from probe() and remove()
  net: ks8851: Factor out TX work flush function
  net: ks8851: Permit overridding interrupt enable register
  net: ks8851: Implement register, FIFO, lock accessor callbacks
  net: ks8851: Separate SPI operations into separate file
  net: ks8851: Implement Parallel bus operations
  net: ks8851: Remove ks8851_mll.c

 drivers/net/ethernet/micrel/Kconfig           |    2 +
 drivers/net/ethernet/micrel/Makefile          |    2 +
 drivers/net/ethernet/micrel/ks8851.h          |  140 +-
 .../micrel/{ks8851.c => ks8851_common.c}      |  686 ++------
 drivers/net/ethernet/micrel/ks8851_mll.c      | 1393 -----------------
 drivers/net/ethernet/micrel/ks8851_par.c      |  343 ++++
 drivers/net/ethernet/micrel/ks8851_spi.c      |  476 ++++++
 7 files changed, 1097 insertions(+), 1945 deletions(-)
 rename drivers/net/ethernet/micrel/{ks8851.c => ks8851_common.c} (62%)
 delete mode 100644 drivers/net/ethernet/micrel/ks8851_mll.c
 create mode 100644 drivers/net/ethernet/micrel/ks8851_par.c
 create mode 100644 drivers/net/ethernet/micrel/ks8851_spi.c

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Petr Stetiar <ynezz@true.cz>
Cc: YueHaibing <yuehaibing@huawei.com>

-- 
2.25.1