[PATCH v4 8/8] arm64: dts: qcom: arduino-imola: Describe NVMEM layout for WiFi/BT addresses
From: Loic Poulain <loic.poulain@oss.qualcomm.com>
Date: 2026-06-09 07:53:42
Also in:
linux-arm-msm, linux-block, linux-bluetooth, linux-devicetree, linux-mmc, linux-wireless, lkml
Subsystem:
arm/qualcomm mailing list, arm/qualcomm support, the rest · Maintainers:
Bjorn Andersson, Konrad Dybcio, Linus Torvalds
On Arduino Uno-Q, the eMMC boot1 partition is factory provisioned with device-specific information such as the WiFi MAC address and the Bluetooth BD address. This partition can serve as an alternative to additional non-volatile memory, such as a dedicated EEPROM. The eMMC boot partitions are typically good candidates, as they are relatively small, read-only by default (and can be enforced as hardware read-only), and are not affected by board reflashing procedures, which generally target the eMMC user or GP partitions. Describe the corresponding nvmem-layout for the WiFi and Bluetooth addresses, and point the WiFi and Bluetooth nodes to the appropriate NVMEM cells to retrieve them. Reviewed-by: Konrad Dybcio <redacted> Reviewed-by: Bartosz Golaszewski <redacted> Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com> --- arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts | 39 ++++++++++++++++++++++ 1 file changed, 39 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts b/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
index bf088fa9807f040f0c8f405f9111b01790b09377..128c7a7e76b5b089044745f5d6407d6391055fc2 100644
--- a/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
+++ b/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts@@ -409,7 +409,40 @@ &sdhc_1 { no-sdio; no-sd; + #address-cells = <1>; + #size-cells = <0>; + status = "okay"; + + card@0 { + compatible = "mmc-card"; + reg = <0>; + + partitions-boot1 { + compatible = "fixed-partitions"; + + #address-cells = <1>; + #size-cells = <1>; + + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + wifi_mac_addr: mac-addr@4400 { + compatible = "mac-base"; + reg = <0x4400 0x6>; + #nvmem-cell-cells = <1>; + }; + + bd_addr: bd-addr@5400 { + compatible = "mac-base"; + reg = <0x5400 0x6>; + #nvmem-cell-cells = <1>; + }; + }; + }; + }; }; &spi5 {
@@ -512,6 +545,9 @@ bluetooth { vddch0-supply = <&pm4125_l22>; enable-gpios = <&tlmm 87 GPIO_ACTIVE_HIGH>; max-speed = <3000000>; + + nvmem-cells = <&bd_addr 0>; + nvmem-cell-names = "local-bd-address"; }; };
@@ -557,6 +593,9 @@ &wifi { qcom,ath10k-calibration-variant = "ArduinoImola"; firmware-name = "qcm2290"; + nvmem-cells = <&wifi_mac_addr 0>; + nvmem-cell-names = "mac-address"; + status = "okay"; };
--
2.34.1