linux-kernel - RE: [PATCH v2 07/12] i2c: riic: Define individual arrays to describe the register offsets

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Date: Fri, 28 Jun 2024 09:13:51 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: Claudiu.Beznea <claudiu.beznea@...on.dev>, Chris Brandt
	<Chris.Brandt@...esas.com>, "andi.shyti@...nel.org" <andi.shyti@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"magnus.damm@...il.com" <magnus.damm@...il.com>, "mturquette@...libre.com"
	<mturquette@...libre.com>, "sboyd@...nel.org" <sboyd@...nel.org>,
	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: RE: [PATCH v2 07/12] i2c: riic: Define individual arrays to describe
 the register offsets

Hi Geert,

> -----Original Message-----
> From: Geert Uytterhoeven <geert@...ux-m68k.org>
> Sent: Friday, June 28, 2024 10:09 AM
> Subject: Re: [PATCH v2 07/12] i2c: riic: Define individual arrays to describe the register offsets
> 
> Hi Biju,
> 
> On Fri, Jun 28, 2024 at 10:09 AM Biju Das <biju.das.jz@...renesas.com> wrote:
> > > -----Original Message-----
> > > From: claudiu beznea <claudiu.beznea@...on.dev> On 28.06.2024 10:55,
> > > Biju Das wrote:
> > > > Are we sure RZ/A does not support fast mode plus?
> > >
> > > From commit description of patch 09/12:
> > >
> > > Fast mode plus is available on most of the IP variants that RIIC
> > > driver is working with. The exception is (according to HW manuals of the SoCs where this IP is
> available) the Renesas RZ/A1H.
> > > For this, patch introduces the struct riic_of_data::fast_mode_plus.
> > >
> > > I checked the manuals of all the SoCs where this driver is used.
> > >
> > > I haven't checked the H/W manual?
> > >
> > > On the manual I've downloaded from Renesas web site the FMPE bit of
> > > RIICnFER is not available on RZ/A1H.
> >
> > I just found RZ/A2M manual, it supports FMP and register layout looks similar to RZ/G2L.
> > Wolfram tested it with r7s72100 genmai board acessing an eeprom. Not sure is it RZ/A1 or RZ/A2?
> 
> Genmai is RZ/A1H (r7s72100).

Thanks for the information. So RZ/A1 is the odd one, which does not have FMP capability,
while others have. 

Cheers,
Biju