On Wednesday 16 December 2015 16:59:39 Rob Herring wrote: > On Mon, Dec 14, 2015 at 3:35 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > On Monday 14 December 2015 15:26:11 Peter Chen wrote: > > I agree on doing it properly, but am not sure that pwrseq binding for > MMC is proper. The pwrseq binding is fairly limited and working around > the driver model IMO. Hubs may also need I2C setup which I don't think > could be done generically other than some defined sequence of i2c > transactions. The current project I'm working on needs to use I2C to > configure the hub to use HSIC mode for example. I really think we need > a pre-probe driver hook to handle this. That would allow device > specific setup to live in the driver. > > Perhaps a more simple approach would be just forcing driver probe if a > DT node is present. I'm not all that familiar with USB drivers, but > presumably there is some setup before probe like setting the USB > device address. We'd have to allow doing that later during probe. Yes, good idea. I was also advocating that approach for MMC at some point, but the power sequencing made it in the end. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
