[PATCH 4/5] ARM: dts: sun6i: Add sun6i-a31s.dtsi
maxime.ripard at free-electrons.com
Thu Dec 4 06:13:46 PST 2014
On Wed, Nov 26, 2014 at 05:39:31PM +0800, Chen-Yu Tsai wrote:
> >>> Are the gates really identical?
> >>> As in not even stripped down?
> >> According to the user manuals, the AHB1 gates on the A31s don't have
> >> GMAC (or EMAC in the manual) and MIPI DSI listed. Though it seems
> >> a lot of A31s hardware out there actually use GMAC.
> > Hmm, interesting I was focussing on the ohci2 gate when comparing them as
> > the ohci2 is not listed in the pinmux.
> > The GMAC clock gate definitely actually is there, as I've an A31s based
> > board
> > with a working GMAC.
> > Also Allwinner has confirmed to me that the A31 and A31s are the same die,
> > so
> > there is no reason to differentiate between the 2 at this level. Either we
> > do
> > no differentiation at all, or only at the pinmux level to reflect that
> > certain
> > pins are simply just not there.
> > My vote goes to differentiating at the pinmux level.
> I agree. Since it is confirmed the dies are the same, the hardware
> description should be the same as well, except for the external
> differences (pinmux). Only downside is a slightly bloated DTB
> containing nodes we will never use on the a31s.
Or we can have a sun6i.dtsi that lists all the hardware, and have the
sun6i-a31.dtsi and sun6i-a31s.dtsi that only define the various
That way we would avoid duplication, especially if they are identical,
while reducing the useless bloat too.
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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