src-test/sys/dev/gpio/gpiomdio.c, branch main

src-test/sys/dev/gpio/gpiomdio.c, branch main FreeBSD source tree https://cgit-dev.freebsd.org/src-test/atom?h=main 2019-12-06T20:21:07Z Add a GPIO based MDIO bit-banging bus driver. 2019-12-06T20:21:07Z Luiz Otavio O Souza loos@FreeBSD.org 2019-12-06T20:21:07Z urn:sha1:fdfcae4a2f94faf96d6701de5fc5a0775cba1e5a Uses two GPIO pins as MDC (clock) and MDIO (bidirectional I/O), relies on mii_bitbang. Tested on SG-3200 where the PHY for one of the ports is wired independently of the SoC MDIO bus. Sponsored by: Rubicon Communications, LLC (Netgate)