On Mon, 2019-08-05 at 17:15 +0200, Andrew Lunn wrote: > [External] > > On Mon, Aug 05, 2019 at 07:54:48PM +0300, Alexandru Ardelean wrote: > > The ADIN PHYs supports 4 types of reset: > > 1. The standard PHY reset via BMCR_RESET bit in MII_BMCR reg > > 2. Reset via GPIO > > 3. Reset via reg GeSftRst (0xff0c) & reload previous pin configs > > 4. Reset via reg GeSftRst (0xff0c) & request new pin configs > > > > Resets 2 & 4 are almost identical, with the exception that the crystal > > oscillator is available during reset for 2. > > > > Resetting via GeSftRst or via GPIO is useful when doing a warm reboot. If > > doing various settings via phytool or ethtool, the sub-system registers > > don't reset just via BMCR_RESET. > > > > This change implements resetting the entire PHY subsystem during probe. > > During PHY HW init (phy_hw_init() logic) the PHY core regs will be reset > > again via BMCR_RESET. This will also need to happen during a PM resume. > > phylib already has support for GPIO reset. So if possible, you should > not repeat that code here. > > What is the difference between a GPIO reset, and a GPIO reset followed > by a subsystem soft reset? there shouldn't be any difference; it's just 2 consecutive resets; i'll take a closer look at phylib's GPIO reset and see > > Andrew
