On Mon, Nov 30, 2009 at 6:17 PM, Tom <[email protected]> wrote: > Grazvydas Ignotas wrote: >> >> hi, >> >> drivers/power/twl4030.c has a twl4030_power_init() function which is >> called by most (all?) OMAP3 boards. What it does is enabling VAUX3, >> VPLL2 and VDAC power supplies in TWL4030/TPS659x0 chip. However they >> are all very board specific and in most cases not needed at all, at >> least for booting the kernel. They also cause regulator warnings on >> latest kernels. >> >> VAUX3: board specific, beagle doesn't have it connected at all, so it >> wastes power there. >> VPLL2: board specific, typically display related, as mainline u-boot >> shows no graphics I think it can be removed. >> VDAC: typically used to power TV-out DACs, can be removed. VDAC and >> VPLL2 is already handled by kernel by DSS2. >> >> So I think VDAC, VPLL2 can be safely removed, probably VAUX3 too with >> whole twl4030_power_init(). >> >> Gražvydas > > Please provide specifics on the kernel warnings. > These should be addressed.
regulator_init_complete: incomplete constraints, leaving VDAC on This can be fixed in kernel itself by declaring regulators as "boot_on" or "always_on", but I think it's better just to not turn them on when they are not needed. > The power setting should be done on board by board basis. > If you are concerned about beagle, please provide a beagle specific > patch. ok will do that for pandora, as that's the hardware I have. Gražvydas _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
