GD25 Flash memory - performance enhancements

drivers/mtd/Kconfig

@@ -1165,6 +1165,38 @@ config GD25_SLOWREAD
 	bool
 	default n
 
+config GD25_START_DELAY
+	int "GD25 startdelay"
+	---help---
+		The delay between CS active and first CLK. In ns.
+	depends on SPI_DELAY_CONTROL
+	range 0 1000000
+	default 5000
+
+config GD25_STOP_DELAY
+	int "GD25 stopdelay"
+	---help---
+		The delay between last CLK and CS inactive. In ns.
+	depends on SPI_DELAY_CONTROL
+	range 0 1000000
+	default 5000
+
+config GD25_CS_DELAY
+	int "GD25 csdelay"
+	---help---
+		The delay between CS inactive and CS active again. In ns.
+	depends on SPI_DELAY_CONTROL
+	range 0 1000000
+	default 5000
+
+config GD25_IFDELAY
+	int "GD25 ifdelay"
+	---help---
+		The delay between frames. In ns.
+	depends on SPI_DELAY_CONTROL
+	range 0 1000000
+	default 5000
+
 endif # MTD_GD25
 
 config MTD_GD5F

drivers/mtd/gd25.c

@@ -230,6 +230,10 @@ static void gd25_lock(FAR struct spi_dev_s *spi)
   SPI_SETBITS(spi, 8);
   SPI_HWFEATURES(spi, 0);
   SPI_SETFREQUENCY(spi, CONFIG_GD25_SPIFREQUENCY);
+#ifdef CONFIG_SPI_DELAY_CONTROL
+  SPI_SETDELAY(spi, CONFIG_GD25_START_DELAY, CONFIG_GD25_STOP_DELAY,
+                    CONFIG_GD25_CS_DELAY, CONFIG_GD25_IFDELAY);
+#endif
 }
 
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