Dear Richard Zhao, > On Wed, Jun 13, 2012 at 10:09:54AM -0500, Rob Herring wrote: > > On 06/13/2012 07:34 AM, Richard Zhao wrote: > > > Sometimes, boards have gpios that don't own by any driver or owner > > > by a generic driver that don't like hacks. Such gpios is normally > > > output and need setup once on boot. So I introduce the config-on-boot > > > gpios. > > > > > > Signed-off-by: Richard Zhao <richard.zhao@xxxxxxxxxxxxx> > > > Cc: Shawn Guo <shawn.guo@xxxxxxxxxx> > > > Cc: Rob Herring <rob.herring@xxxxxxxxxxx> > > > Cc: Grant Likely <grant.likely@xxxxxxxxxxxx> > > > --- > > > > > > .../devicetree/bindings/arm/config-on-boot.txt | 12 +++++++ > > > arch/arm/boot/dts/imx6q-sabrelite.dts | 7 ++++ > > > arch/arm/mach-imx/mach-imx6q.c | 35 > > > ++++++++++++++++++++ 3 files changed, 54 insertions(+) > > > create mode 100644 > > > Documentation/devicetree/bindings/arm/config-on-boot.txt > > > > > > diff --git a/Documentation/devicetree/bindings/arm/config-on-boot.txt > > > b/Documentation/devicetree/bindings/arm/config-on-boot.txt new file > > > mode 100644 > > > index 0000000..f98ed74 > > > --- /dev/null > > > +++ b/Documentation/devicetree/bindings/arm/config-on-boot.txt > > > @@ -0,0 +1,12 @@ > > > +* Configure on Boot > > > + > > > +Node name: config-on-boot > > > + It must be in root node. config-on-boot means to describe settings > > > that needs + to be set one time on boot but aren't owned by any > > > driver, or the owned driver + is too generic to handle such settings. > > > For example, usb hub uses generic + driver in usb core code, a > > > on-board usb may need deassert reset pin. > > > > NAK. This is not a h/w description > > It's misc things, but is hw description. > > > and should be solved within the > > kernel or bootloader. Either fix this in u-boot, > > Kernel might be better not to depend on uboot. And we don't want to polute uboot either, so this is a good move. > > the platform code, or > > How do I get gpio in platfrom code without dts description? Write a driver that does the GPIO setup in some generic way? Wasn't there something about this stuff going on? Shawn, you had some comments /wrt the M28 DTS. This might be what you meant? > > make the generic driver support this in a generic way. > > It's called just after populate devices. It's hard for generic driver to > decide when it's called. > > Thanks > Richard Best regards, Marek Vasut -- 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
