linux-kernel - Re: [PATCH v2 7/7] memory: renesas-rpc-if: Add support for RZ/G2L

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Message-ID: <CA+V-a8sidj+FXF0k4dPCgZz2RUHyKsghc75-=Ka2vCkJEFP+xg@mail.gmail.com>
Date:   Wed, 3 Nov 2021 09:12:53 +0000
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>,
        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>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-mtd@...ts.infradead.org,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 7/7] memory: renesas-rpc-if: Add support for RZ/G2L

Hi Wolfram,

On Wed, Nov 3, 2021 at 8:41 AM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
> Hi Prabhakar,
>
> > Oops I missed that, does the below look good?
>
> Yes, only a minor nit.
>
> >
> > #define RPCIF_PHYADD_ADD_MD 0x00
> > #define RPCIF_PHYADD_ADD_RDLSEL 0x22
> > #define RPCIF_PHYADD_ADD_FDLSEL 0x24
> > #define RPCIF_PHYADD_ADD_RDLMON 0x26
> > #define RPCIF_PHYADD_ADD_FDLMON 0x28
> >
> > #define RPCIF_PHYADD_ACCEN BIT(31)
> > #define RPCIF_PHYADD_RW BIT(30)
>
> Maybe we could leave this because we don't use it? You decide.
>
Agreed will drop RPCIF_PHYADD_RW macro.

> > > +     regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00000030);
> > > +     regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000032);
> > >
> > For the above do you have any suggestions? As I couldn't find any
> > details about it or shall I just go with magic numbers for now?
>
> Ack. I couldn't find docs about these as well. I suggest to add a
> comment where this value came from. We can ask the BSP and/or HW team
> for details and update this pair incrementally.
>
Thanks, I'll add a comment stating the values have come from the
RZ/G2L HW manual.

Cheers,
Prabhakar

> > thanks, once we agree upon above I shall re-spin v3.
>
> Cool, looking forward to it!
>
> Happy hacking,
>
>    Wolfram
>