Re: [PATCH 03/17] ARM: dts: r8a7742: Add I2C and IIC support

Wolfram Sang
2020-05-22T20:17:35Z

[-- Attachment #1: Type: text/plain, Size: 1215 bytes --]

> > According to the Hardware User's Manual Rev. 1.00, the registers do exist
> > on all RZ/G1, except for RZ/G1E (see below).
> >
> > "(automatic transmission can be used as a hardware function, but this is
> > not meaningful for actual use cases)."
> >
> > (whatever that comment may mean?)

Strange comment, in deed. Given the paragraph before, I would guess Gen1
maybe had a "fitting" PMIC where SoC/PMIC handled DVFS kind of magically
with this automatic transfer feature? And Gen2 has not.

> > On R-Car E3 and RZ/G2E, which have a single IIC instance, we
> > handled that by:
> >
> > The r8a77990 (R-Car E3) and r8a774c0 (RZ/G2E)
> > controllers are not considered compatible with
> > "renesas,rcar-gen3-iic" or "renesas,rmobile-iic"
> > due to the absence of automatic transmission registers.

From a "describe the HW" point of view, this still makes sense to me.
Although, it is unlikely we will add support for the automatic
transmission feature (maybe famous last words).

> > On R-Car E2 and RZ/G1E, we forgot, and used both SoC-specific and
> > family-specific compatible values.

Okay, but we can fix DTs when they have bugs, or?

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]