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

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Message-ID: <CA+V-a8uyQmW3+4hAt4534spKeQHDoeZzuJJE4RY70KLZfYOXoA@mail.gmail.com>
Date:   Fri, 1 Oct 2021 10:06:06 +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 9:55 AM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
> Hi Prabhakar,
>
> > > 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!
>
> > > > +     regmap_write(rpc->regmap, RPCIF_PHYADJ2, 0x00008080);
> > > > +     regmap_write(rpc->regmap, RPCIF_PHYADJ1, 0x80000024);
> > >
> > > Can't we have defines for these magic values? At least in my latest Gen3
> > > documentation, these values are explained.
> > >
> > RZ/G2L manual doesn't explain these bits. Let me refer to R-Car Gen3
> > and define them as macros.
>
> Seems like we have the best of both worlds then with the documentation
> ;)
>
Indeed :)

> > > > +     if (rpc->type == RPCIF_RCAR_GEN3) {
> > > > +             regmap_write(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_STRTIM(7) |
> > > > +                          RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0) | 0x260);
> > > > +     } else {
> > > > +             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.
>
> Hmm, maybe I should then update the patch avoiding undocumented register
> access beforehand? I will download your docs and see what remains and
> send that out for you to check. Somewhen later today.
>
> Sounds good?
>
Fine with me.

Cheers,
Prabhakar

> Happy hacking,
>
>    Wolfram
>