add 32M spi reboot patch for mtk762x

target/linux/ramips/patches-4.14/999-fix-m25p-shutdown.patch

+diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
+index 24e1ea3..b1ff69a 100644
+--- a/drivers/mtd/devices/m25p80.c
++++ b/drivers/mtd/devices/m25p80.c
+@@ -313,6 +313,21 @@ static int m25p_remove(struct spi_device *spi)
+ 	return mtd_device_unregister(&flash->spi_nor.mtd);
+ }
+ 
++static void m25p_shutdown(struct spi_device *spi)
++{
++	struct m25p	*flash = spi_get_drvdata(spi);
++
++	if ((&flash->spi_nor)->addr_width > 3) {
++		printk(KERN_INFO "m25p80: exit 4-byte address mode\n");
++		flash->command[0] = SPINOR_OP_EX4B;  // exit 4-byte address mode: 0xe9
++		spi_write(flash->spi, flash->command, 1);
++		flash->command[0] = 0x66;  // enable reset
++		spi_write(flash->spi, flash->command, 1);
++		flash->command[0] = 0x99;  // reset
++		spi_write(flash->spi, flash->command, 1);
++	}
++}
++
+ /*
+  * Do NOT add to this array without reading the following:
+  *
+@@ -387,6 +402,7 @@ static struct spi_driver m25p80_driver = {
+ 	.id_table	= m25p_ids,
+ 	.probe	= m25p_probe,
+ 	.remove	= m25p_remove,
++	.shutdown = m25p_shutdown,
+ 
+ 	/* REVISIT: many of these chips have deep power-down modes, which
+ 	 * should clearly be entered on suspend() to minimize power use.