Hi Phil, > Subject: RE: usb: typec: driver for TI HD3SS3220 USB Type-C DRP port > controller question > > Hi Heikki, > > On 21 June 2022 08:23 Heikki Krogerus wrote: > > On Mon, Jun 20, 2022 at 09:04:10AM +0000, Phil Edworthy wrote: > > > Hi Heikki, > > > > > > I have a board that uses the TI HD3SS3220 USB Type-C DRP port > > > controller [1], however it doesn't have the interrupt line > > > connected. How would you recommend I handle this? Should I get the > > > driver to poll the i2c registers? > > > > > > [1] > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/t > > > ree/drivers/usb/typec/hd3ss3220.c?h=v5.19-rc3 > > > > If you have some other way of detecting connections on your system, > > then we probable could consider some kind of notifier, but as a > > general solution for the lack of interrupt, I think polling is the > > only way. > Thanks for your comments. > > I wonder if this is a problem that affects quite a few drivers, where a > generic polling solution can be used instead of interrupts. This would > require a driver-specific function that can detect when an interrupt > would have occurred, e.g. by reading a register via i2c. > This is already done like that for ethernet PHY interrupts. You mean like PHY at subsystem level, check IRQ is present in dt or not?, if present use IRQ otherwise Use polling. > > > I'll add the list, and Aswath and Roger. Aswath and Roger were looking > > at the same problem with the tps6598x (tipd) driver. > > Thanks > Phil
