linux-kernel - Re: [PATCH v2] arm64: dts: rockchip: add EEPROM node for NanoPi R4S

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Date:   Sun, 20 Jun 2021 12:41:23 +0800
From:   Tianling Shen <cnsztl@...il.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
        Marty Jones <mj8263788@...il.com>,
        Jensen Huang <jensenhuang@...endlyarm.com>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: rockchip: add EEPROM node for NanoPi R4S

Hi Heiko,

On Sun, Jun 20, 2021 at 6:11 AM Heiko Stuebner <heiko@...ech.de> wrote:
>
> Hi,
>
> Am Donnerstag, 10. Juni 2021, 11:13:57 CEST schrieb Tianling Shen:
> > NanoPi R4S has a EEPROM attached to the 2nd I2C bus (U92), which
> > stores the MAC address.
> >
> > 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>
>
> this produces errors when building the dtb:
>   DTC     arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dtb
> ../arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts:84.4-22: Warning (reg_format): /i2c@...20000/eeprom@...mac-address@fa:reg: property has invalid length (8 bytes) (#address-cells == 2, #size-cells == 1)
> arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtb: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
> arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtb: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
> arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtb: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
> ../arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts:83.31-85.5: Warning (avoid_default_addr_size): /i2c@...20000/eeprom@...mac-address@fa: Relying on default #address-cells value
> ../arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts:83.31-85.5: Warning (avoid_default_addr_size): /i2c@...20000/eeprom@...mac-address@fa: Relying on default #size-cells value
>
> in the eeprom node you'll need to define #address-cells and #size-cells
> for this to work.

Thanks for pointing this out, added in v3.

Thanks,
Tianling.

>
> Thanks
> Heiko
>
>
> > ---
> >  .../boot/dts/rockchip/rk3399-nanopi-r4s.dts    | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > index cef4d18b599d..50d3b11eb925 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > @@ -68,6 +68,24 @@
> >       status = "disabled";
> >  };
> >
> > +&gmac {
> > +     nvmem-cells = <&mac_address>;
> > +     nvmem-cells-names = "mac-address";
> > +};
> > +
> > +&i2c2 {
> > +     eeprom@51 {
> > +             compatible = "microchip,24c02", "atmel,24c02";
> > +             reg = <0x51>;
> > +             pagesize = <16>;
> > +             size = <256>;
> > +
> > +             mac_address: mac-address@fa {
> > +                     reg = <0xfa 0x06>;
> > +             };
> > +     };
> > +};
> > +
> >  &i2c4 {
> >       status = "disabled";
> >  };
> >
>
>
>
>