| Message ID | 20250305100134.1171124-2-manikandan.m@microchip.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [1/2] mtd: spi-nor: sst: register SFDP region into NVMEM framework to read MAC Address | expand |
On Wed Mar 5, 2025 at 11:01 AM CET, Manikandan Muralidharan wrote: > Add nvmem-layout in QSPI to describe EUI48 MAC address region. > This is useful for cases where U-Boot is skipped and the Ethernet > MAC address is needed to be configured in Linux. > > Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com> > --- > .../arm/boot/dts/microchip/at91-sama5d29_curiosity.dts | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts > index 7be215781549..81aca8502195 100644 > --- a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts > +++ b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts > @@ -480,6 +480,16 @@ flash@0 { > label = "atmel_qspi1"; > status = "okay"; > > + nvmem-layout { > + compatible = "fixed-layout"; > + #address-cells = <1>; > + #size-cells = <1>; > + > + mac_address_eui48: mac-address@261 { I don't think the offset should be hardcoded in the device tree. Apparently it is a property of this very chip (and not backed up by a JEDEC standard). What happens if the SFDP are changed for this flash? I.e. The length of the SFDP region changes. Also, this looks like it is a layout for the SPI flash contents and not the SFDP, how do you differentiate between these two? Also please update your device tree to use 'compatible = "fixed-partitions"'. -michael > + reg = <0x261 0x6>; > + }; > + }; > + > at91bootstrap@0 { > label = "at91bootstrap"; > reg = <0x0 0x40000>;
diff --git a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts index 7be215781549..81aca8502195 100644 --- a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts +++ b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts @@ -480,6 +480,16 @@ flash@0 { label = "atmel_qspi1"; status = "okay"; + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + mac_address_eui48: mac-address@261 { + reg = <0x261 0x6>; + }; + }; + at91bootstrap@0 { label = "at91bootstrap"; reg = <0x0 0x40000>;
Add nvmem-layout in QSPI to describe EUI48 MAC address region. This is useful for cases where U-Boot is skipped and the Ethernet MAC address is needed to be configured in Linux. Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com> --- .../arm/boot/dts/microchip/at91-sama5d29_curiosity.dts | 10 ++++++++++ 1 file changed, 10 insertions(+)