>> right, use that to call phy_init() at the right time, then you need to >> add a new ->calibrate() method which, likely, will only be used by you >> ;-) > so you mean, the xhci should itself call phy_init() at a time suitable, > so that ->calibrate() is not required at all ? I'm not sure if that's a good idea because it would require phy_init() and calibrate() to always mean the same thing. The calibrate() for Exynos5420 needs to be called both during boot and after system resume, but there might be other platforms that don't want to completely shutdown and reinit their PHYs during suspend/resume with the same functions used for boot. For example, Tegra5 (proposed driver at http://www.spinics.net/lists/linux-usb/msg113093.html) can power-gate the PHY during suspend, but that's not running the same code as in the phy_init()/phy_shutdown() methods (the posted patch doesn't contain all power-gating code yet, but you can get an idea about how it has to work from https://chromium.googlesource.com/chromiumos/third_party/kernel-next/+/chromeos-3.10/drivers/usb/host/xhci-tegra.c). It would also mean that the initial phy_init() call must always come after the XHCI reset, and I am not sure if that would fit nicely with all platforms. > right, and what's more generic than adding the support for PHYs straight into xHCI ? Well, if we are going to have a calibrate() method (as in "stuff the PHY does after every controller reset if it needs to"), we have to add it either to the XHCI stack or the USB core. I thought the USB core would be more generic, because in theory it's possible that e.g. an EHCI controller might have a similar requirement. (Also, we have the gen_phy pointer in a USB core structure (struct usb_hcd), so I thought making this feature generic to the USB core and thus available to all kinds of host controllers would be more natural.) -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
 |