[PATCH 5/5] arm64: dts: qcom: ipq5332: add support to get watchdog bootstatus from IMEM

[Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>]

Add the "sram" property to the watchdog device node to enable
retrieval of the system restart reason from IMEM, populated by XBL.
Parse this information in the watchdog driver and update the bootstatus
sysFS if the restart was triggered by a watchdog timeout.

Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/ipq5332.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq5332.dtsi b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
index 3e10f45e182e..6a54a548b4f8 100644
--- a/arch/arm64/boot/dts/qcom/ipq5332.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
@@ -496,8 +496,16 @@ qpic_nand: spi@79b0000 {
 		sram@8600000 {
 			compatible = "qcom,ipq5332-imem", "mmio-sram";
 			reg = <0x08600000 0x14000>;
+			ranges = <0 0x08600000 0x14000>;
 
 			no-memory-wc;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			restart_reason: restartreason-sram@7b0 {
+				reg = <0x7a4 0x4>;
+			};
 		};
 
 		usb: usb@8af8800 {
@@ -585,6 +593,7 @@ watchdog: watchdog@b017000 {
 			interrupts = <GIC_SPI 3 IRQ_TYPE_EDGE_RISING>;
 			clocks = <&sleep_clk>;
 			timeout-sec = <30>;
+			sram = <&restart_reason>;
 		};
 
 		apcs_glb: mailbox@b111000 {

-- 
2.34.1