soc: tegra: add t21x panic handler

drivers/soc/tegra/pmc.c

@@ -419,6 +419,8 @@ struct tegra_pmc_soc {
 	bool has_usb_sleepwalk;
 	bool supports_core_domain;
 	bool has_single_mmio_aperture;
+
+	bool cboot_panic_notifier;
 };
 
 /**
@@ -505,6 +507,7 @@ struct tegra_pmc {
 	unsigned long *wake_cntrl_level_map;
 
 	struct notifier_block reboot_notifier;
+	struct notifier_block panic_notifier;
 	struct syscore syscore;
 
 	/* Pending wake IRQ processing */
@@ -3199,6 +3202,20 @@ static int tegra_pmc_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (pmc->soc->cboot_panic_notifier) {
+		pmc->panic_notifier.notifier_call = tegra_pmc_panic_handler;
+		pmc->panic_notifier.priority = INT_MAX-1;
+
+		err = atomic_notifier_chain_register(&panic_notifier_list,
+					&pmc->panic_notifier);
+		if (err) {
+			dev_err(&pdev->dev,
+				"unable to register panic notifier, %d\n",
+				err);
+			return err;
+		}
+	}
+
 	err = devm_register_sys_off_handler(&pdev->dev,
 					    SYS_OFF_MODE_RESTART,
 					    SYS_OFF_PRIO_LOW,
@@ -4018,6 +4035,7 @@ static const struct tegra_pmc_soc tegra210_pmc_soc = {
 	.has_blink_output = true,
 	.has_usb_sleepwalk = true,
 	.has_single_mmio_aperture = true,
+	.cboot_panic_notifier = true,
 };
 
 static const char * const tegra210b01_powergates[] = {
@@ -4079,6 +4097,7 @@ static const struct tegra_pmc_soc tegra210b01_pmc_soc = {
 	.has_blink_output = true,
 	.has_usb_sleepwalk = true,
 	.has_single_mmio_aperture = true,
+	.cboot_panic_notifier = true,
 };
 
 static const struct tegra_io_pad_soc tegra186_io_pads[] = {