Re: [PATCH v2] check: Add 10bit/slave i2c reg flags support

[Rob Herring]

On Sat, May 30, 2020 at 3:32 AM Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
>
>
> > +     addr = reg & 0x3FFFFFFFU;
> > +     snprintf(unit_addr, sizeof(unit_addr), "%x", addr);
>
> Hmm, this hardcoded value will not work if we ever need to add another
> bit. I hope this will never happen, though.

I had this concern and requested the first time this was submitted
(and abandoned) to just mask out the top byte. However, Joel's version
of this fix[1] does some actual checks on 10-bit addressing, so I've
dropped that request.

> > +             if ((reg & (1U << 31)) && addr > 0x3ff)
>
> Same here with bit 31. I haven't checked DTC but can't we import the
> header with the defines into the project? Or is this then a circular
> dependency?

Easier to just duplicate the define here which Joel's patches do.

Rob

[1] https://www.spinics.net/lists/devicetree-compiler/msg03196.html