[PATCH DO NOT MERGE 5/6] ARM: dts: omap4: add some sample clkctrl data

[Tony Lindgren]

* Tero Kristo <t-kristo at ti.com> [170302 10:45]:
> On 02/03/17 19:45, Tony Lindgren wrote:
> > Hi,
> > 
> > * Tero Kristo <t-kristo at ti.com> [170213 05:24]:
> > > Adds clkctrl nodes for cm_l4per and cm_abe as example. Peripherals using
> > > clocks from these nodes are modified also.
> > 
> > Finally got around testing these. Looks like applying this patch
> > breaks things for devices not using the new clocks entry?
> > 
> > For example, SPI now breaks causing "imprecise external abort" during boot
> > at least on droid 4.
> 
> If SPI is under l4per, then yes, a breakage is expected. This will cause a
> conflict with the existing hwmod data, and the new clock data, effectively
> disabling the IP clocks during boot. This patch only converts part of the DT
> data to the new format, and as such is only suitable for testing purposes.
> 
> I will provide a full data conversion for the DT file for 4.11-rc.

OK

> > > --- a/arch/arm/boot/dts/omap4.dtsi
> > > +++ b/arch/arm/boot/dts/omap4.dtsi
> > > +				cm_l4per: cm_l4per at 0 {
> > 
> > Above should be cm_l4per: cm_l4per at 1400, right?
> 
> Yea thats a bug in this test patch. Same issue with other nodes. DT compiler
> isn't too picky about these so it works even with wrong node name.
> 
> > 
> > > +					compatible = "ti,omap4-cm";
> > > +					reg = <0x1400 0x200>;
> > > +					#address-cells = <1>;
> > > +					#size-cells = <1>;
> > > +					ranges = <0 0x1400 0x200>;
> > > +
> > > +					cm_l4per_clkctrl: cm_l4per_clkctrl at 20 {
> > > +						compatible = "ti,omap4-clkctrl";
> > > +						reg = <0x20 0x1b0>;
> > > +						#clock-cells = <2>;
> > > +					};
> > > +				};
> > 
> > You should update the binding doc accordingly if the "cm_l4per at 0" node
> > there is not needed. I also noticed the binding doc still has
> > "#clock-cells = <4>" while it should be 2.
> 
> cm_l4per is somewhat redundant right now, but we want to add clockdomains
> under that one in the future. Or, we could just add those directly under
> parent node also (cm2 in this case.)

OK so probably best to add it to avoid tweaking the dts files again
later on.

Regards,

Tony