Re: [PATCH/RFC 4/6] dt-bindings: i2c: renesas,iic: Convert to json-schema

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

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> Possible alternative interpretations of the note are:
>   - Only IIC3 has the automatic transmission registers.  But the
>     automatic transmission feature is not useful as the SoCs lack DVFS
>     support.

I immediately thought "yeah, this is it", but had to do some resarch
where my assumption comes from. I found it in older H2 datasheets
(v0.9). Here in 56.1:

"Automatic transmission for PMIC control: The IIC3 module of the R-Car
H2 and M2 supports automatic data transmission under PMIC control
(DVFS)."

Or table 56.8:

"Registers of IIC Command for Automatic Transmission Mode (IIC3 only)
[R-CarH2, M2, and V2H]"


This all is a strong indication for IIC3 only. Which SoCs that have is
still confusing. Table 56.8 mentions V2H but 56.1 doesn't. Then again, I
could imagine that V2H has it but simply DVFS is not advertised for V2H.
And in the later documents, DVFS advertisement was removed for H2 and M2
as well.

(PS: sorry for replying to the "wrong" thread, I accidently deleted the
"correct" one)


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