Re: [PATCH 04/10] dt-bindings: memory: mt7621: add syscon as compatible string

Sergio Paracuellos
2022-09-15T03:21:41Z

On Wed, Sep 14, 2022 at 5:19 PM Arınç ÜNAL <arinc.unal@arinc9.com> wrote:
>
> On 14.09.2022 18:14, Rob Herring wrote:
> > On Wed, Sep 14, 2022 at 11:54:45AM +0300, Arınç ÜNAL wrote:
> >> Add syscon as a constant string on the compatible property as it's required
> >> for the SoC to work. Update the example accordingly.
> >
> > It's not required. It's required to automagically create a regmap. That
> > can be done yourself as well. The downside to adding 'syscon' is it
> > requires a DT update. Maybe that's fine for this platform? I don't know.
>
> My GB-PC2 won't boot without syscon on mt7621.dtsi. This string was
> always there on the memory controller node on mt7621.dtsi.

The string was introduced because the mt7621 clock driver needs to
read some registers creating a regmap from the syscon. The bindings
were added before the clock driver was properly mainlined and at first
the clock driver was using ralink architecture dependent operations
rt_memc_* defined in
'arch/mips/include/asm/mach-ralink/ralink_regs.h'. I forgot to update
the mem controller binding when memc became a syscon so I think this
patch is correct. I also think the sample should use 'syscon' in the
node name instead of memory-controller.

Best regards,
Sergio Paracuellos
>
> Arınç