On 02/11/2013 02:00 PM, Tony Lindgren wrote: > * Stephen Warren <[email protected]> [130211 12:57]: >> On 02/10/2013 01:11 PM, Linus Walleij wrote: >>> From: Laurent Meunier <[email protected]> >>> >>> This update adds a debugfs interface to modify a pin configuration >>> for a given state in the pinctrl map. This allows to modify the >>> configuration for a non-active state, typically sleep state. >>> This configuration is not applied right away, but only when the state >>> will be entered. >>> >>> This solution is mandated for us by HW validation: in order >>> to test and verify several pin configurations during sleep without >>> recompiling the software. >> >> I never understood why HW engineers can't just recompile the kernel. >> Besides, it's just a device tree change these days - no recompile even >> required, right? > > Typically when bringing up a new board you do not have the driver > specific mux settings verified. For developers, it's easiest to tweak > the muxing during runtime do the drivers as a loadable module, then > export the verified mux configuration into a .dts file.
Well HW engineers typically just write to the HW registers directly rather than screwing around with the Linux pinctrl tables and unloading/reloading drivers. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
