arm64: dts: qcom: sa8775p: pmic: add the sdam_0 node

Introduce sdam_0 node, which is to be used via nvmem for power on
reasons during reboot. Add supported PoN reaons supported via sdam_0
node.
Signed-off-by: Parikshit Pareek <quic_ppareek@quicinc.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Tested-by: Eric Chanudet <echanude@redhat.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230417145536.414490-4-brgl@bgdev.pl

arch/arm64/boot/dts/qcom/sa8775p-pmics.dtsi

@@ -88,6 +88,14 @@ trip1 {
 			};
 		};
 	};
+
+	reboot-mode {
+		compatible = "nvmem-reboot-mode";
+		nvmem-cells = <&reboot_reason>;
+		nvmem-cell-names = "reboot-mode";
+		mode-recovery = <0x01>;
+		mode-bootloader = <0x02>;
+	};
 };
 
 &spmi_bus {
@@ -133,6 +141,19 @@ pmm8654au_0_gpios: gpio@8800 {
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		pmm8654au_0_sdam_0: nvram@7100 {
+			compatible = "qcom,spmi-sdam";
+			reg = <0x7100>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0x7100 0x100>;
+
+			reboot_reason: reboot-reason@48 {
+				reg = <0x48 0x1>;
+				bits = <1 7>;
+			};
+		};
 	};
 
 	pmm8654au_1: pmic@2 {