linux-kernel - Re: [PATCH 6/6] memory: renesas-rpc-if: Add support for RZ/G2L

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Message-ID: <CA+V-a8vQ2EoMW18aEq5Ssa71M6VvA6YtOzU2UAe7L1Puorr07Q@mail.gmail.com>
Date:   Fri, 1 Oct 2021 13:53:30 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Vignesh Raghavendra <vigneshr@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Mark Brown <broonie@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-mtd@...ts.infradead.org,
        linux-spi <linux-spi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH 6/6] memory: renesas-rpc-if: Add support for RZ/G2L

Hi Wolfram,

On Fri, Oct 1, 2021 at 1:04 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
> Hi Prabhakar,
>
> I checked the G2L datasheet and reconsidered. It is better if your patch
> goes in first. That means...
>
> > > > > Is RPCIF_CMNCR_IO3FV and RPCIF_CMNCR_IO2FV actually documented in your
> > > > > datasheets? I am asking because I have a patch pending to remove writing
> > > > > to undocumented locations. So, I was aboout to remove the IO3FV and
> > > > > IO2FV macros.
> > > > >
> > > > Yes they are documented, you should be able to download the HW manual from [1]
> > >
> > > Great, then I will keep them!
>
> ... that you could change the comments here from "undocumented" to
> "documened for G2L" or similar.
>
> > > > > > +             regmap_read(rpc->regmap, RPCIF_PHYCNT, &dummy);
> > > > > > +             dummy &= ~RPCIF_PHYCNT_PHYMEM_MASK;
> > > > > > +             dummy |= RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0) | 0x260;
> > > > > > +             regmap_write(rpc->regmap, RPCIF_PHYCNT, dummy);
> > > > >
> > > > > regmap_update_bits?
> > > > >
> > > > Im a bit hesitant to use regmap_update_bits() here as some of the bits
> > > > are not documented.
>
> Here you can keep your code as is. I will change it afterwards if needed
> once I clarified all undocumented locations.
>
Thanks, will re-spin the patches with comments fixed.

> Thanks and have a nice weekend,
>
You too.

Cheers,
Prabhakar

>    Wolfram
>