linux-kernel - Re: [PATCH v4] arm64: dts: rockchip: add EEPROM node for NanoPi R4S

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Message-ID: <CAOP2_TiBA0HZPO4tDviUuLMvw+oHe4BR3wiAMwdRodjfuEfVow@mail.gmail.com>
Date:   Tue, 13 Sep 2022 22:44:54 +0800
From:   Tianling Shen <cnsztl@...il.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] arm64: dts: rockchip: add EEPROM node for NanoPi R4S

Hi Heiko,

On Tue, Sep 13, 2022 at 6:22 PM Heiko Stuebner <heiko@...ech.de> wrote:
>
> Hi,
>
> Am Sonntag, 11. September 2022, 06:06:28 CEST schrieb Tianling Shen:
> > NanoPi R4S has a EEPROM attached to the 2nd I2C bus (U92), which
> > stores the MAC address.
> >
> > FriendlyElec ship two versions of the R4S [1]: The standard as well
> > as the enterprise edition with only the enterprise edition including
> > the EEPROM chip that stores the unique MAC address.
>
> This needs to go differently.
>
> If the eeprom is only preset on the enterprise-version, you need
> a separate devicetree for it, that provides the eeprom node.
>
> Declaring the eeprom "in error" on a device that doesn't have it,
> isn't the way to go.
>
> Look for example at rockchip/rk3399-nanopi-m4b.dts for reference
> on how to do it - and also remember to add the new binding
> for that board. And can also again declare the correct mac-address
> cell.
>

Got it, thank you! I will do it these days.

Regards,
Tianling.

>
> Heiko
>
> >
> > 1. https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R4S#Differences_Between_R4S_Standard_Version_.26_R4S_Enterprise_Version
> >
> > Changes in v4:
> > - Removed `mac-address` cell as it breaks the standard edition
> >
> > Changes in v3:
> > - Added address-cells and size-cells
> >
> > Changes in v2:
> > - Added the size of EEPROM
> > - Added `mac-address` cell to pass the MAC address to kernel
> > - Removed `read-only` property in EEPROM node
> >
> > Signed-off-by: Tianling Shen <cnsztl@...il.com>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > index fe5b52610010..42c99573ab27 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > @@ -68,6 +68,17 @@ &emmc_phy {
> >       status = "disabled";
> >  };
> >
> > +&i2c2 {
> > +     eeprom@51 {
> > +             compatible = "microchip,24c02", "atmel,24c02";
> > +             reg = <0x51>;
> > +             pagesize = <16>;
> > +             size = <256>;
> > +             #address-cells = <1>;
> > +             #size-cells = <1>;
> > +     };
> > +};
> > +
> >  &i2c4 {
> >       status = "disabled";
> >  };
> >
>
>
>
>