linux-kernel - Re: [PATCH] arm64: dts: ls1046a: fix eeprom entries

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Message-ID: <CADRPPNSbzpqs2VOV6DMUF5VP1Gx=W9-2W91Rt9ELEZxT+xsgvA@mail.gmail.com>
Date:   Tue, 3 Aug 2021 17:20:25 -0500
From:   Li Yang <leoyang.li@....com>
To:     Raag Jadav <raagjadav@...il.com>
Cc:     Shawn Guo <shawnguo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: ls1046a: fix eeprom entries

On Tue, Aug 3, 2021 at 2:45 PM Raag Jadav <raagjadav@...il.com> wrote:
>
> On Mon, Aug 02, 2021 at 05:44:29PM -0500, Li Yang wrote:
> > On Mon, Aug 2, 2021 at 1:10 PM Raag Jadav <raagjadav@...il.com> wrote:
> > >
> > > ls1046afrwy and ls1046ardb boards have CAT24C04[1] and CAT24C05[2]
> > > eeproms respectively. Both are 4Kb (512 bytes) in size.
> >
> > These part names are from onsemi instead of atmel.  Are there same
> > part names from atmel which are also compatible with the onsemi parts?
>
> The part names are different, but they are functionally compatible.
>
> >  If we want to use onsemi only part names, probably we will need two
> > compatible strings with the first one from onsemi and the second from
> > atmel.  Although the binding doesn't support onsemi prefix yet.
>
> Should I add it to the at24 binding document with atmel as a fallback?

I think that will be the best.

>
> >
> > > Remove multi-address entries, as we have auto-rollover support
> > > in at24 driver.
> >
> > The device tree should describe hardware instead of matching how
> > driver deal with it.  Is the board really using a single chip or
> > multiple chips here?
>
> Yes, both the boards have a single chip each.

Then I am fine with the change, but please make it clear in the description.

>
> >
> > >
> > > [1] https://www.onsemi.com/pdf/datasheet/cat24c01-d.pdf
> > > [2] https://www.onsemi.com/pdf/datasheet/cat24c03-d.pdf
> > >
> > > Signed-off-by: Raag Jadav <raagjadav@...il.com>
> > > ---
> > >  arch/arm64/boot/dts/freescale/fsl-ls1046a-frwy.dts | 8 +-------
> > >  arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts  | 7 +------
> > >  2 files changed, 2 insertions(+), 13 deletions(-)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1046a-frwy.dts b/arch/arm64/boot/dts/freescale/fsl-ls1046a-frwy.dts
> > > index db3d303..83afe21 100644
> > > --- a/arch/arm64/boot/dts/freescale/fsl-ls1046a-frwy.dts
> > > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1046a-frwy.dts
> > > @@ -83,15 +83,9 @@
> > >                         };
> > >
> > >                         eeprom@52 {
> > > -                               compatible = "atmel,24c512";
> > > +                               compatible = "atmel,24c04";
> > >                                 reg = <0x52>;
> > >                         };
> > > -
> > > -                       eeprom@53 {
> > > -                               compatible = "atmel,24c512";
> > > -                               reg = <0x53>;
> > > -                       };
> > > -
> > >                 };
> > >         };
> > >  };
> > > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts b/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts
> > > index 60acdf0..d220f98 100644
> > > --- a/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts
> > > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1046a-rdb.dts
> > > @@ -59,14 +59,9 @@
> > >         };
> > >
> > >         eeprom@52 {
> > > -               compatible = "atmel,24c512";
> > > +               compatible = "atmel,24c04";
> > >                 reg = <0x52>;
> > >         };
> > > -
> > > -       eeprom@53 {
> > > -               compatible = "atmel,24c512";
> > > -               reg = <0x53>;
> > > -       };
> > >  };
> > >
> > >  &i2c3 {
> > > --
> > > 2.7.4
> > >