serial: ifx6x60: Add modem power off function in the platform reboot process

index 5b9bc19..a91f4cb 100644
@@ -60,6 +60,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/spi/ifx_modem.h>
 #include <linux/delay.h>
+#include <linux/reboot.h>
 
 #include "ifx6x60.h"
 

@@ -72,8 +73,14 @@
 #define IFX_SPI_HEADER_0		(-1)
 #define IFX_SPI_HEADER_F		(-2)
 
+#define PO_POST_DELAY		200
+#define IFX_MDM_RST_PMU	4
+
 /* forward reference */
 static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
+static int ifx_modem_reboot_callback(struct notifier_block *nfb,
+				unsigned long event, void *data);
+static int ifx_modem_power_off(struct ifx_spi_device *ifx_dev);
 
 /* local variables */
 static int spi_bpw = 16;		/* 8, 16 or 32 bit word length */

@@ -81,6 +88,29 @@ static struct tty_driver *tty_drv;
 static struct ifx_spi_device *saved_ifx_dev;
 static struct lock_class_key ifx_spi_key;
 
+static struct notifier_block ifx_modem_reboot_notifier_block = {
+	.notifier_call = ifx_modem_reboot_callback,
+};
+
+static int ifx_modem_power_off(struct ifx_spi_device *ifx_dev)
+{
+	gpio_set_value(IFX_MDM_RST_PMU, 1);
+	msleep(PO_POST_DELAY);
+
+	return 0;
+}
+
+static int ifx_modem_reboot_callback(struct notifier_block *nfb,
+				 unsigned long event, void *data)
+{
+	if (saved_ifx_dev)
+		ifx_modem_power_off(saved_ifx_dev);
+	else
+		pr_warn("no ifx modem active \n");
+
+	return NOTIFY_OK;
+}
+
 /* GPIO/GPE settings */
 
 /**

@@ -1219,6 +1249,9 @@ static int ifx_spi_spi_remove(struct spi_device *spi)
 
 static void ifx_spi_spi_shutdown(struct spi_device *spi)
 {
+	struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
+
+	ifx_modem_power_off(ifx_dev);
 }
 
 /*

@@ -1368,6 +1401,7 @@ static void __exit ifx_spi_exit(void)
 static int __init ifx_spi_init(void)
 {
 	int result;
+	int ret;
 
 	tty_drv = alloc_tty_driver(1);
 	if (!tty_drv) {

@@ -1399,6 +1433,11 @@ static int __init ifx_spi_init(void)
 			DRVNAME, result);
 		tty_unregister_driver(tty_drv);
 	}
+
+	ret = register_reboot_notifier(&ifx_modem_reboot_notifier_block);
+	if (ret)
+		pr_err("cannot register reboot notifier (err=%d)\n", ret);
+
 	return result;
 }