X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=include%2Fspi_flash.h;h=4d4ae89c192111914045444990ae9e81f2f8a509;hb=64cfeda8ae2e95751c5d2dfa4dc4a906478ae2f6;hp=55b4721813a7a8531f36b273fa89323b874afc94;hpb=7f21ced0d2488605ccf6eb307daa9e18ee78aa94;p=platform%2Fkernel%2Fu-boot.git

diff --git a/include/spi_flash.h b/include/spi_flash.h
index 55b4721..4d4ae89 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -9,10 +9,11 @@
 #ifndef _SPI_FLASH_H_
 #define _SPI_FLASH_H_
 
-#include <dm.h>	/* Because we dereference struct udevice here */
 #include <linux/types.h>
 #include <linux/mtd/spi-nor.h>
 
+struct udevice;
+
 /* by default ENV use the same parameters than SF command */
 #ifndef CONFIG_ENV_SPI_BUS
 # define CONFIG_ENV_SPI_BUS	CONFIG_SF_DEFAULT_BUS
@@ -52,7 +53,7 @@ struct dm_spi_flash_ops {
 /* Access the serial operations for a device */
 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
 
-#ifdef CONFIG_DM_SPI_FLASH
+#if CONFIG_IS_ENABLED(DM_SPI_FLASH)
 /**
  * spi_flash_read_dm() - Read data from SPI flash
  *
@@ -102,6 +103,18 @@ int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
  */
 int spl_flash_get_sw_write_prot(struct udevice *dev);
 
+/**
+ * spi_flash_std_probe() - Probe a SPI flash device
+ *
+ * This is the standard internal method for probing a SPI flash device to
+ * determine its type. It can be used in chip-specific drivers which need to
+ * do this, typically with of-platdata
+ *
+ * @dev: SPI-flash device to probe
+ * @return 0 if OK, -ve on error
+ */
+int spi_flash_std_probe(struct udevice *dev);
+
 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
 			   unsigned int max_hz, unsigned int spi_mode,
 			   struct udevice **devp);
@@ -111,7 +124,9 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 				  unsigned int max_hz, unsigned int spi_mode);
 
 /* Compatibility function - this is the old U-Boot API */
-void spi_flash_free(struct spi_flash *flash);
+static inline void spi_flash_free(struct spi_flash *flash)
+{
+}
 
 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 				 size_t len, void *buf)
@@ -150,6 +165,9 @@ static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 	struct mtd_info *mtd = &flash->mtd;
 	size_t retlen;
 
+	if (!len)
+		return 0;
+
 	return mtd->_read(mtd, offset, len, &retlen, buf);
 }
 
@@ -159,6 +177,9 @@ static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 	struct mtd_info *mtd = &flash->mtd;
 	size_t retlen;
 
+	if (!len)
+		return 0;
+
 	return mtd->_write(mtd, offset, len, &retlen, buf);
 }
 
@@ -173,6 +194,9 @@ static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 		return -EINVAL;
 	}
 
+	if (!len)
+		return 0;
+
 	memset(&instr, 0, sizeof(instr));
 	instr.addr = offset;
 	instr.len = len;