Hi, On Wed, Jun 18, 2014 at 10:17:34PM -0500, Nishanth Menon wrote: > On 06/18/2014 10:05 PM, Felipe Balbi wrote: > > Hi, > > > > On Wed, Jun 18, 2014 at 09:26:01PM -0500, Nishanth Menon wrote: > >> On 06/18/2014 06:19 PM, Felipe Balbi wrote: > >> [...] > >>>>>>> Add support for TI's AM437x StarterKit Evaluation > >>>>>>> Module. > >>>>>> > >>>>>> is there a link for this platform? > >>>>> > >>>>> internal only > >>>> > >>>> but will eventually be sold externally? I assume this is not an TI > >>> > >>> probably, but there's nothing public yet. > >>> > >>>> internal only board. > >>> > >>> correct assumption for all I know. > >> > >> Yikes.. ok.. I'd let Tony et.al make the call on this, I guess. > > > > would we really block a DTS just because there's no public wiki page > > available (yet) ? > > > > Sounds a bit extreme to me. > > If this is an TI internal board without anyone outside that a few > select developers being able to get and work on it... I am a bit > skeptical on upstream kernel support and burden for forseeable future > in ensuring it is tested and continually maintained. if it an > one-off.. maybe fork might be good enough.. upstream not too attractive.
dude, this is a Starter Kit after all. The probability of being sold
eventually is really, really high. I just can't confirm it certainly
will right now.
> I mean, if it is targeted to be sold eventually, I have no objections
> or blocks - just make it clear in commit message. I can imagine folks
> wondering what the heck this is and googling without results(just like
> I did).
I'll point you to schematics and internal wiki tomorrow if you want. I'm
sure there will be a public ti.com address for it though.
> [...]
>
> >>>>>>> + cd-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;
> >>>>>>> +};
> >>>>>>> +
> >>>>>>> +&usb2_phy1 {
> >>>>>>> + status = "okay";
> >>>>>>> +};
> >>>>>>> +
> >>>>>>> +&usb1 {
> >>>>>>> + dr_mode = "peripheral";
> >>>>>>> + status = "okay";
> >>>>>>> +};
> >>>>>>> +
> >>>>>>> +&usb2_phy2 {
> >>>>>>> + status = "okay";
> >>>>>>> +};
> >>>>>>> +
> >>>>>>> +&usb2 {
> >>>>>>> + dr_mode = "host";
> >>>>>>> + status = "okay";
> >>>>>>> +};
> >>>>>> none of the above need pinctrl? no regulator supplies?
> >>>>>
> >>>>> pins in default states, drivers don't use regulators.
> >>>>
> >>>> USB works without a supply? even a fixed voltage supply? that is
> >>>> weird.
> >>>
> >>> take a look at the minicom output I posted if you don't believe. Well,
> >>> to be exact, tps63010 [1] is the one which generates the regulated V5_0D
> >>> which is used as VBUS_USB. The enable pin in that device is tied to the
> >>> 3v3 rail (dcdc4 regulator in the PMIC as most everything else) but
> >>> there's no way (otherwise) to control that thing. There's no control
> >>> bus, no way to write a driver.
> >>>
> >>> Since the board will anyways turn off if you disable the 3v3 rail, it's
> >>> pretty much pointless to figure out a hack just to add this to DTS.
> >>>
> >>> [1] http://www.ti.com/product/TPS63010
> >>
> >> I am sure to trust you on the test log :) -> but then from dts description
> >> perspective, it is good if we describe the supplies, even as a always on
> >> fixed-regulator. We had instances like 2430SDP ethernet where... umm... we
> >> originally missed describing ethernet supply and boom, one fine morning, no
> >> more nfs filesystem - I mean, it is a one off scenario there, but
> >> describing
> >> regulators helps us atleast understand the power tree of the board a little
> >> better.
> >>
> >> Again, no strong opinions on my side, it is a good thing to do is all
> >> I feel about it.
> >
> > you mean something like:
> >
> > V5_0D: fixedregulator@0 {
> > compatible = "regulator-fixed";
> > regulator-name = "V5_0D";
> > regulator-min-microvolt = <5000000>;
> > regulator-max-microvolt = <5000000>;
> > regulator-boot-on;
> > regulator-always-on;
> > vin-supply = <&dcdc4>;
> > };
> >
> > VBUS_USB: fixedregulator@1 {
> > compatible = "regulator-fixed";
> > regulator-name = "VBUS_USB";
> > regulator-min-microvolt = <5000000>;
> > regulator-max-microvolt = <5000000>;
> > regulator-boot-on;
> > regulator-always-on;
> > vin-supply = <&V5_0D>;
> > };
> >
> > I can add that, but note that it's *solely* to make sysfs look nice. And
> > if that's the case, most likely *every* DTS file in tree today as
> > incomplete. OTOH, I really consider this to be hugely unnecessary
> > because of the fact that board will turn off if 3v3 (dcdc4) is disabled.
> >
>
>
> Yes - something along those lines - Again, no strong opinions on my
> side for these - just that it is a good thing to model in and may help
> drivers where can use the awareness.
if you ask me, it's just two extra instances of the fixed regulator
driver for a really marginal added benefit.
--
balbi
signature.asc
Description: Digital signature
