modem/alt1250: Add lowerhalf I/F to set power manager

Add new interface to set power manager for resuming LTE function
from sleep mode.

boards/arm/cxd56xx/common/src/cxd56_alt1250.c

@@ -38,6 +38,7 @@
 
 #include <arch/board/board.h>
 #include <arch/board/cxd56_alt1250.h>
+#include <arch/chip/pm.h>
 
 #include "cxd56_spi.h"
 #include "cxd56_dmac.h"
@@ -80,6 +81,7 @@
 static struct spi_dev_s *alt1250_poweron(void);
 static void alt1250_poweroff(void);
 static bool alt1250_powerstatus(void);
+static int  alt1250_hibernation_mode(bool enable);
 static void alt1250_reset(void);
 static void alt1250_irqattach(xcpt_t handler);
 static void alt1250_irqenable(bool enable);
@@ -97,6 +99,7 @@ static const struct alt1250_lower_s g_alt1250_lower =
   .poweron      = alt1250_poweron,
   .poweroff     = alt1250_poweroff,
   .powerstatus  = alt1250_powerstatus,
+  .hiber_mode   = alt1250_hibernation_mode,
   .reset        = alt1250_reset,
   .irqattach    = alt1250_irqattach,
   .irqenable    = alt1250_irqenable,
@@ -307,6 +310,30 @@ static bool alt1250_powerstatus(void)
   return board_alt1250_powerstatus();
 }
 
+/****************************************************************************
+ * Name: alt1250_hibernation_mode
+ *
+ * Description:
+ *   Set power manager for entering hibernation mode.
+ *
+ ****************************************************************************/
+
+static int alt1250_hibernation_mode(bool enable)
+{
+  uint32_t bootmask = 0;
+
+  if (enable)
+    {
+      /* Set GPIO interrupt for wake-up */
+
+      bootmask = up_pm_get_bootmask();
+      bootmask |= PM_BOOT_COLD_GPIO;
+      up_pm_set_bootmask(bootmask);
+    }
+
+  return board_alt1250_powerkeep(enable);
+}
+
 /****************************************************************************
  * Name: alt1250_reset
  *

include/nuttx/modem/alt1250.h

@@ -306,6 +306,7 @@ struct alt1250_lower_s
   FAR struct spi_dev_s * (*poweron)(void);
   void (*poweroff)(void);
   bool (*powerstatus)(void);
+  int  (*hiber_mode)(bool);
   void (*reset)(void);
   void (*irqattach)(xcpt_t handler);
   void (*irqenable)(bool enable);