[U-Boot] [PATCH 4/5] omap3_beagle: support findfdt and loadfdt for devicetree support

[Nishanth Menon <nm@ti.com>]

On 18:17-20130711, Robert Nelson wrote:
> On Thu, Jul 11, 2013 at 5:17 PM, Nishanth Menon <nm@ti.com> wrote:
> > On 17:05-20130711, Robert Nelson wrote:
> >> On Thu, Jul 11, 2013 at 5:03 PM, Nishanth Menon <nm@ti.com> wrote:
> >> > On 17:02-20130711, Robert Nelson wrote:
> >> >> On Thu, Jul 11, 2013 at 4:52 PM, Nishanth Menon <nm@ti.com> wrote:
> >> >> > For folks not using concatenated device tree with uImage, having
> >> >> > an handy function to find and load device tree is very handy.
> >> >> >
> >> >> > So introduce findfdt and loadfdt and run findfdt by default to make
> >> >> > it easier on user scripts.
> >> >> >
> >> >> > Signed-off-by: Nishanth Menon <nm@ti.com>
> >> >> > ---
> >> >> >  include/configs/omap3_beagle.h |   17 +++++++++++++++++
> >> >> >  1 file changed, 17 insertions(+)
> >> >> >
> >> >> > diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
> >> >> > index bdeee17..7833208 100644
> >> >> > --- a/include/configs/omap3_beagle.h
> >> >> > +++ b/include/configs/omap3_beagle.h
> >> >> > @@ -210,6 +210,8 @@
> >> >> >  #define CONFIG_EXTRA_ENV_SETTINGS \
> >> >> >         "loadaddr=0x80200000\0" \
> >> >> >         "rdaddr=0x81000000\0" \
> >> >> > +       "fdt_high=0xffffffff\0" \
> >> >> > +       "fdtaddr=0x80f80000\0" \
> >> >> >         "usbtty=cdc_acm\0" \
> >> >> >         "bootfile=uImage\0" \
> >> >> >         "ramdisk=ramdisk.gz\0" \
> >> >> > @@ -250,6 +252,19 @@
> >> >> >                 "omapdss.def_disp=${defaultdisplay} " \
> >> >> >                 "root=${nandroot} " \
> >> >> >                 "rootfstype=${nandrootfstype}\0" \
> >> >> > +       "findfdt=" \
> >> >> > +               "if test $beaglerev = AxBx; then " \
> >> >> > +                       "setenv fdtfile omap3-beagle.dtb; fi; " \
> >> >> > +               "if test $beaglerev = Cx; then " \
> >> >> > +                       "setenv fdtfile omap3-beagle.dtb; fi; " \
> >> >> > +               "if test $beaglerev = xMA; then " \
> >> >> > +                       "setenv fdtfile omap3-beagle-xm.dtb; fi; " \
> >> >> > +               "if test $beaglerev = xMB; then " \
> >> >> > +                       "setenv fdtfile omap3-beagle-xm.dtb; fi; " \
> >> >>
> >> >> There is no need for the "xMB" variant, as the gpio pins used for
> >> >> identification where never changed from the xMA when the newer silcon
> >> >> was used for the xMB (i guess if we look at the omap's es revision, we
> >> >> could figure out which are xMB's, but right now that isn't done in
> >> >> u-boot....)
> >> > I suppose then the following is ok to do as well?
> >> > diff --git a/board/ti/beagle/beagle.c b/board/ti/beagle/beagle.c
> >> > index c686f40..6094b0f 100644
> >> > --- a/board/ti/beagle/beagle.c
> >> > +++ b/board/ti/beagle/beagle.c
> >> > @@ -369,16 +369,6 @@ int misc_init_r(void)
> >> >                                         TWL4030_PM_RECEIVER_VAUX2_DEV_GRP,
> >> >                                         TWL4030_PM_RECEIVER_DEV_GRP_P1);
> >> >                 break;
> >> > -       case REVISION_XM_B:
> >> > -               printf("Beagle xM Rev B\n");
> >> > -               setenv("beaglerev", "xMB");
> >> > -               MUX_BEAGLE_XM();
> >> > -               /* Set VAUX2 to 1.8V for EHCI PHY */
> >> > -               twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED,
> >> > -                                       TWL4030_PM_RECEIVER_VAUX2_VSEL_18,
> >> > -                                       TWL4030_PM_RECEIVER_VAUX2_DEV_GRP,
> >> > -                                       TWL4030_PM_RECEIVER_DEV_GRP_P1);
> >> > -               break;
> >> >         case REVISION_XM_C:
> >> >                 printf("Beagle xM Rev C\n");
> >> >                 setenv("beaglerev", "xMC");
> >>
> >> Correct, as a cleanup we can nuke that xMB section..
> >>
> >> For some bike shed paining we could rename:
> >>
> >> Beagle xM Rev A -> Beagle xM Rev A/B
> >>
> >> Above that too. ;)
> > OK - I suspect and am not sure how dvi_pup will get handled in the
> > resultant diff, What do folks think of the following?
> 
> A quick review of all my old xM schematics i have access to and the
> ones on https://github.com/CircuitCo/
> 
> For the "dvi_pup" function
> 
> GPIO_170 was only used on the pre-production xM's P8/P9, i doubt any
> of them still operate (mine died)..
> 
> It was then switched to GPIO_129 for the xMA, however there where MMC
> issues, so it was changed for xMA1 (and thus xMA2)
> notes, top of this:
> https://github.com/CircuitCo/BeagleBoard-xM-RevC/blob/master/BeagleBoard-xM_revC_SCH.pdf
> 
> TPS_GPIO_2: was then used on xMA3 -> and all later generations...
> 
> So also looking at:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/mach-omap2/board-omap3beagle.c#n161
> 
> Looks like the original beagle needs GPIO_170..
> 
> So I'd just set GPIO_170 for:
> 
> case REVISION_AXBX:
> case REVISION_CX:
> case REVISION_C4:
> 
> and ignore all the pre-production xM P8/P8's/xMA..
> 
> Side note, I think 'first' customers just got the xMA2 and newer.. As
> i was one of the first, and it's still running downstairs..

ok, here is how the code looks like with the V2 of my series:

Do we just default to none for XM_AB for dvi_pup?

static void beagle_dvi_pup(void)
{
	uchar val;

	switch (get_board_revision()) {
	case REVISION_AXBX:
	case REVISION_CX:
	case REVISION_C4:
	case REVISION_XM_AB:
		gpio_request(170, "");
		gpio_direction_output(170, 0);
		gpio_set_value(170, 1);
		break;
	case REVISION_XM_C:
	default:
		#define GPIODATADIR1 (TWL4030_BASEADD_GPIO+3)
		#define GPIODATAOUT1 (TWL4030_BASEADD_GPIO+6)

		i2c_read(TWL4030_CHIP_GPIO, GPIODATADIR1, 1, &val, 1);
		val |= 4;
		i2c_write(TWL4030_CHIP_GPIO, GPIODATADIR1, 1, &val, 1);

		i2c_read(TWL4030_CHIP_GPIO, GPIODATAOUT1, 1, &val, 1);
		val |= 4;
		i2c_write(TWL4030_CHIP_GPIO, GPIODATAOUT1, 1, &val, 1);
		break;
	}
}

-- 
Regards,
Nishanth Menon