Improve m25px driver

drivers/mtd/Kconfig

@@ -408,6 +408,10 @@ config M25P_SPIMODE
 	int "M25P SPI mode"
 	default 0
 
+config M25P_SPIFREQUENCY
+	int "M25P SPI Frequency"
+	default 20000000
+
 config M25P_MANUFACTURER
 	hex "M25P manufacturers ID"
 	default 0x20

drivers/mtd/m25px.c

@@ -69,6 +69,10 @@
 #  define CONFIG_M25P_SPIMODE SPIDEV_MODE0
 #endif
 
+#ifndef CONFIG_M25P_SPIFREQUENCY
+#  define CONFIG_M25P_SPIFREQUENCY 20000000
+#endif
+
 /* Various manufacturers may have produced the parts.  0x20 is the manufacturer ID
  * for the STMicro MP25x serial FLASH.  If, for example, you are using the a Macronix
  * International MX25 serial FLASH, the correct manufacturer ID would be 0xc2.
@@ -137,6 +141,7 @@
 #define M25P_M25P32_NSECTORS       64
 #define M25P_M25P32_PAGE_SHIFT     8     /* Page size 1 << 8 = 256 */
 #define M25P_M25P32_NPAGES         16384
+#define M25P_M25PX32_SUBSECT_SHIFT 12    /* Sub-Sector size 1 << 12 = 4,096 */
 
 /*  M25P64 capacity is 8,338,608 bytes:
  *  (128 sectors) * (65,536 bytes per sector)
@@ -285,7 +290,7 @@ static void m25p_lock(FAR struct spi_dev_s *dev)
   SPI_SETMODE(dev, CONFIG_M25P_SPIMODE);
   SPI_SETBITS(dev, 8);
   (void)SPI_HWFEATURES(dev, 0);
-  (void)SPI_SETFREQUENCY(dev, 20000000);
+  (void)SPI_SETFREQUENCY(dev, CONFIG_M25P_SPIFREQUENCY);
 }
 
 /************************************************************************************
@@ -383,6 +388,9 @@ static inline int m25p_readid(struct m25p_dev_s *priv)
            priv->nsectors       = M25P_M25P32_NSECTORS;
            priv->pageshift      = M25P_M25P32_PAGE_SHIFT;
            priv->npages         = M25P_M25P32_NPAGES;
+#ifdef CONFIG_M25P_SUBSECTOR_ERASE
+           priv->subsectorshift = M25P_M25PX32_SUBSECT_SHIFT;
+#endif
            return OK;
         }
       else if (capacity == M25P_M25P64_CAPACITY)

include/nuttx/sched.h

@@ -852,7 +852,7 @@ void sched_suspend_scheduler(FAR struct tcb_s *tcb);
  *   to application code.
  *
  * Input Parameters:
- *   tcb - The TCB of the thread to be restarted.
+ *   tcb - The TCB of the thread.
  *
  * Returned Value:
  *   None