Re: [PATCH v2 3/4] arm/dts: OMAP4: Add mmc controller nodes and board data

[Grant Likely <grant.likely@secretlab.ca>]

On Fri, 24 Feb 2012 15:56:52 +0530, Rajendra Nayak <rnayak@ti.com> wrote:
> On Friday 24 February 2012 03:46 PM, T Krishnamoorthy, Balaji wrote:
> >> diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
> >> index 29f4589..9204f60 100644
> >> --- a/arch/arm/boot/dts/omap4.dtsi
> >> +++ b/arch/arm/boot/dts/omap4.dtsi
> >> @@ -25,6 +25,11 @@
> >>                 serial1 =&uart2;
> >>                 serial2 =&uart3;
> >>                 serial3 =&uart4;
> >> +               mmc1 =&mmc1;
> >> +               mmc2 =&mmc2;
> >> +               mmc3 =&mmc3;
> >> +               mmc4 =&mmc4;
> >> +               mmc5 =&mmc5;
> >>         };
> >>
> >>         cpus {
> >> @@ -155,5 +160,31 @@
> >>                         #size-cells =<0>;
> >>                         ti,hwmods = "i2c4";
> >>                 };
> >> +
> >> +               mmc1: mmc@1 {
> >> +                       compatible = "ti,omap4-hsmmc";
> >> +                       ti,hwmods = "mmc1";
> >> +                       ti,dual-volt;
> >> +               };
> >> +
> >> +               mmc2: mmc@2 {
> >> +                       compatible = "ti,omap4-hsmmc";
> >> +                       ti,hwmods = "mmc2";
> >> +               };
> >
> > Hi Rajendra,
> > Is there a way to control the device registration order,
> > eMMC connected to mmc2 needs to be registered as /dev/mmcblk0p ...
> > irrespective of whether SD card is mount or not on mmc1 card slot.
> > So that bootargs would not have to be modified when filesystem is on eMMC.
> 
> I don't know if we can, but even if we could, we take care of the same
> bootargs working on two boards (say sdp and panda) *if* on sdp I have my
> filesystem on eMMC and on panda I have it on external card.
> What happens if I want to use my filesystem on both boards on external
> card?

of_alias_get_id() may be able to help you here.  It will extract the id
numbering from the /aliases node.  That is the safe way to do global
enumeration of devices in the device tree (instead of 'cell-index' which
is strongly discouraged)

g.

> 
> >
> >> +
> >> +               mmc3: mmc@3 {
> >> +                       compatible = "ti,omap4-hsmmc";
> >> +                       ti,hwmods = "mmc3";
> >> +               };
> >> +
> >> +               mmc4: mmc@4 {
> >> +                       compatible = "ti,omap4-hsmmc";
> >> +                       ti,hwmods = "mmc4";
> >> +               };
> >> +
> >> +               mmc5: mmc@5 {
> >> +                       compatible = "ti,omap4-hsmmc";
> >> +                       ti,hwmods = "mmc5";
> >> +               };
> >>         };
> >>   };
> >> --
> >> 1.7.1
> >>
> 
> 
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-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.