On Mon, Jun 7, 2021 at 5:31 PM Johan Jonker <jbx6244@xxxxxxxxx> wrote:
>
> Hi Tianling,
>
> On 6/7/21 10:17 AM, Tianling Shen wrote:
> > NanoPi R4S has a EEPROM attached to the 2nd I2C bus (U92), which
> > stores the MAC address.
> >
> > Signed-off-by: Tianling Shen <cnsztl@xxxxxxxxx>
> > ---
> > arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts | 9 +++++++++
> > 1 file changed, 9 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..4a82f50a07c5 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> > @@ -68,6 +68,15 @@
> > status = "disabled";
> > };
> >
> > +&i2c2 {
> > + eeprom@51 {
> > + compatible = "microchip,24c02", "atmel,24c02";
> > + reg = <0x51>;
> > + pagesize = <16>;
>
> > + read-only; /* This holds our MAC */
>
> The mainline dts files should be generic I think.
> Any comment about "use", partitions or write ability should be avoided.
> It's up the user.
Per the datasheet for this specific EEPROM, the latter half (128 bytes)
is read-only in hardware by design though.
ChenYu
