Re: [Patch v6 3/4] dt-bindings: memory: Update reg maxitems for tegra186

[Ashish Mhetre]

On 4/11/2022 8:59 PM, Dmitry Osipenko wrote:
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>
> On 4/11/22 18:02, Ashish Mhetre wrote:
> > On 4/10/2022 7:51 PM, Dmitry Osipenko wrote:
> > > External email: Use caution opening links or attachments
> > >
> > >
> > > 06.04.2022 08:24, Ashish Mhetre пишет:
> > > >            memory-controller@2c00000 {
> > > >                compatible = "nvidia,tegra186-mc";
> > > > -            reg = <0x0 0x02c00000 0x0 0xb0000>;
> > > > +            reg = <0x0 0x02c00000 0x0 0x10000>,    /* MC-SID */
> > > > +                  <0x0 0x02c10000 0x0 0x10000>,    /* Broadcast
> > > > channel */
> > > > +                  <0x0 0x02c20000 0x0 0x10000>,    /* MC0 */
> > > > +                  <0x0 0x02c30000 0x0 0x10000>,    /* MC1 */
> > > > +                  <0x0 0x02c40000 0x0 0x10000>,    /* MC2 */
> > > > +                  <0x0 0x02c50000 0x0 0x10000>;    /* MC3 */
> > > > +            reg-names = "mc-sid", "mc-broadcast", "mc0", "mc1",
> > > > "mc2", "mc3";
> > >
> > > The "mc-" prefix feels redundant to me, I'd name the regs like this:
> > >
> > >     "sid", "broadcast", "ch0", "ch1", "ch2", "ch3"
> > >
> > >
> > > You should also add validation of the regs/reg-names to the yaml based
> > > on SoC version. I.e. it's not enough to only bump the maxItems.
> >
> > Okay, I will add validation of reg-names as following:
> >
> >    reg-names:
> >      minItems: 0
> >      maxItems: 6
> >      items:
> >        - const: sid
> >        - const: broadcast
> >        - const: ch0
> >        - const: ch1
> >        - const: ch2
> >        - const: ch3
> >
> >
> > We will have to keep minItems to 0 in order to make it compatible with
> > old DT, right?
>
> Bindings are about the latest DTs. In general older dtbs must be updated
> and you must get error from the schema checker for older DTs. It's only
> drivers that should care about older dtbs.

On v5 Krzysztof mentioned that old DTS will start failing with new
bindings https://lkml.org/lkml/2022/3/22/907.
So I just wanted to confirm whether it's fine if updated bindings
start to fail with old DTS?