mtd: spi-nor: drop replaceable wait-till-ready function pointer

We don't need to expose a 'wait-till-ready' interface to drivers. Status
register polling should be handled by the core spi-nor.c library, and as
of now, I see no need to provide a special driver-specific hook for it.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/mtd/spi-nor/spi-nor.c

@@ -195,6 +195,10 @@ static int spi_nor_ready(struct spi_nor *nor)
 	return sr && fsr;
 }
 
+/*
+ * Service routine to read status register until ready, or timeout occurs.
+ * Returns non-zero if error.
+ */
 static int spi_nor_wait_till_ready(struct spi_nor *nor)
 {
 	unsigned long deadline;
@@ -215,15 +219,6 @@ static int spi_nor_wait_till_ready(struct spi_nor *nor)
 	return -ETIMEDOUT;
 }
 
-/*
- * Service routine to read status register until ready, or timeout occurs.
- * Returns non-zero if error.
- */
-static int wait_till_ready(struct spi_nor *nor)
-{
-	return nor->wait_till_ready(nor);
-}
-
 /*
  * Erase the whole flash memory
  *
@@ -708,7 +703,7 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 
 		/* write one byte. */
 		nor->write(nor, to, 1, retlen, buf);
-		ret = wait_till_ready(nor);
+		ret = spi_nor_wait_till_ready(nor);
 		if (ret)
 			goto time_out;
 	}
@@ -720,7 +715,7 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 
 		/* write two bytes. */
 		nor->write(nor, to, 2, retlen, buf + actual);
-		ret = wait_till_ready(nor);
+		ret = spi_nor_wait_till_ready(nor);
 		if (ret)
 			goto time_out;
 		to += 2;
@@ -729,7 +724,7 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 	nor->sst_write_second = false;
 
 	write_disable(nor);
-	ret = wait_till_ready(nor);
+	ret = spi_nor_wait_till_ready(nor);
 	if (ret)
 		goto time_out;
 
@@ -740,7 +735,7 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 		nor->program_opcode = SPINOR_OP_BP;
 		nor->write(nor, to, 1, retlen, buf + actual);
 
-		ret = wait_till_ready(nor);
+		ret = spi_nor_wait_till_ready(nor);
 		if (ret)
 			goto time_out;
 		write_disable(nor);
@@ -786,7 +781,7 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
 			if (page_size > nor->page_size)
 				page_size = nor->page_size;
 
-			ret = wait_till_ready(nor);
+			ret = spi_nor_wait_till_ready(nor);
 			if (ret)
 				goto write_err;
 
@@ -812,7 +807,7 @@ static int macronix_quad_enable(struct spi_nor *nor)
 	nor->cmd_buf[0] = val | SR_QUAD_EN_MX;
 	nor->write_reg(nor, SPINOR_OP_WRSR, nor->cmd_buf, 1, 0);
 
-	if (wait_till_ready(nor))
+	if (spi_nor_wait_till_ready(nor))
 		return 1;
 
 	ret = read_sr(nor);
@@ -892,9 +887,6 @@ static int spi_nor_check(struct spi_nor *nor)
 		return -EINVAL;
 	}
 
-	if (!nor->wait_till_ready)
-		nor->wait_till_ready = spi_nor_wait_till_ready;
-
 	return 0;
 }
 

include/linux/mtd/spi-nor.h

@@ -144,7 +144,6 @@ enum spi_nor_option_flags {
  * @write_xfer:		[OPTIONAL] the writefundamental primitive
  * @read_reg:		[DRIVER-SPECIFIC] read out the register
  * @write_reg:		[DRIVER-SPECIFIC] write data to the register
- * @wait_till_ready:	[REPLACEABLE] wait till the NOR becomes ready
  * @read:		[DRIVER-SPECIFIC] read data from the SPI NOR
  * @write:		[DRIVER-SPECIFIC] write data to the SPI NOR
  * @erase:		[DRIVER-SPECIFIC] erase a sector of the SPI NOR
@@ -176,7 +175,6 @@ struct spi_nor {
 	int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
 	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
 			int write_enable);
-	int (*wait_till_ready)(struct spi_nor *nor);
 
 	int (*read)(struct spi_nor *nor, loff_t from,
 			size_t len, size_t *retlen, u_char *read_buf);