[PATCH RFC 5/5] arm64: dts: qcom: glymur-crd: Source MAC addresses from a UEFI variable

[Abel Vesa]

Add an nvmem-efivar provider exposing the "MacAddresses" UEFI variable,
carrying the Bluetooth BD_ADDR (bytes 0-5) and the WLAN MAC address
(bytes 6-11), both MSB first. The variable is looked up by name, so no
vendor GUID needs to be hardcoded.

Wire the bd-address cell to the Bluetooth controller and the mac-address
cell to the WLAN endpoint (pci17cb,1107) via the standard nvmem-cells
binding. Until the variable is provisioned the cells read as zeroes and
the controllers keep using their default addresses.

Assisted-by: LLM
Signed-off-by: Abel Vesa <abel.vesa at oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/glymur-crd.dtsi | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/glymur-crd.dtsi b/arch/arm64/boot/dts/qcom/glymur-crd.dtsi
index 58158b51fe29..2dd09ab1d550 100644
--- a/arch/arm64/boot/dts/qcom/glymur-crd.dtsi
+++ b/arch/arm64/boot/dts/qcom/glymur-crd.dtsi
@@ -31,6 +31,22 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	/* BD_ADDR and WLAN MAC from the "MacAddresses" UEFI variable. */
+	efivar_macs: nvmem-efivar {
+		compatible = "nvmem-efivar";
+		efivar-name = "MacAddresses";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		bt_bdaddr: bd-address at 0 {
+			reg = <0x0 0x6>;
+		};
+
+		net_mac: mac-address at 6 {
+			reg = <0x6 0x6>;
+		};
+	};
+
 	clocks {
 		xo_board: xo-board {
 			compatible = "fixed-clock";
@@ -776,6 +792,9 @@ wifi at 0 {
 		compatible = "pci17cb,1107";
 		reg = <0x10000 0x0 0x0 0x0 0x0>;
 
+		nvmem-cells = <&net_mac>;
+		nvmem-cell-names = "mac-address";
+
 		vddaon-supply = <&vreg_pmu_aon_0p59>;
 		vddwlcx-supply = <&vreg_pmu_wlcx_0p8>;
 		vddwlmx-supply = <&vreg_pmu_wlmx_0p85>;
@@ -1163,6 +1182,9 @@ bluetooth {
 		compatible = "qcom,wcn7850-bt";
 		max-speed = <3200000>;
 
+		nvmem-cells = <&bt_bdaddr>;
+		nvmem-cell-names = "bd-address";
+
 		vddaon-supply = <&vreg_pmu_aon_0p59>;
 		vddwlcx-supply = <&vreg_pmu_wlcx_0p8>;
 		vddwlmx-supply = <&vreg_pmu_wlmx_0p85>;

-- 
2.54.0