mtd: rawnand: ingenic: Fix ingenic_ecc dependency

If MTD_NAND_JZ4780 is y and MTD_NAND_JZ4780_BCH is m,
which select CONFIG_MTD_NAND_INGENIC_ECC to m, building fails:

drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function `ingenic_nand_remove':
ingenic_nand.c:(.text+0x177): undefined reference to `ingenic_ecc_release'
drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function `ingenic_nand_ecc_correct':
ingenic_nand.c:(.text+0x2ee): undefined reference to `ingenic_ecc_correct'

To fix that, the ingenic_nand and ingenic_ecc modules have been fused
into one single module.
- The ingenic_ecc.c code is now compiled in only if
  $(CONFIG_MTD_NAND_INGENIC_ECC) is set. This is now a boolean instead
  of tristate.
- To avoid changing the module name, the ingenic_nand.c file is moved to
  ingenic_nand_drv.c. Then the module name is still ingenic_nand.
- Since ingenic_ecc.c is no more a module, the module-specific macros
  have been dropped, and the functions are no more exported for use by
  the ingenic_nand driver.

Fixes: 15de8c6e ("mtd: rawnand: ingenic: Separate top-level and SoC specific code")
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Hulk Robot <hulkci@huawei.com>
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/ingenic/Kconfig

@@ -16,7 +16,7 @@ config MTD_NAND_JZ4780
 if MTD_NAND_JZ4780
 
 config MTD_NAND_INGENIC_ECC
-	tristate
+	bool
 
 config MTD_NAND_JZ4740_ECC
 	tristate "Hardware BCH support for JZ4740 SoC"

drivers/mtd/nand/raw/ingenic/Makefile

@@ -2,7 +2,9 @@
 obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
 obj-$(CONFIG_MTD_NAND_JZ4780) += ingenic_nand.o
 
-obj-$(CONFIG_MTD_NAND_INGENIC_ECC) += ingenic_ecc.o
+ingenic_nand-y += ingenic_nand_drv.o
+ingenic_nand-$(CONFIG_MTD_NAND_INGENIC_ECC) += ingenic_ecc.o
+
 obj-$(CONFIG_MTD_NAND_JZ4740_ECC) += jz4740_ecc.o
 obj-$(CONFIG_MTD_NAND_JZ4725B_BCH) += jz4725b_bch.o
 obj-$(CONFIG_MTD_NAND_JZ4780_BCH) += jz4780_bch.o

drivers/mtd/nand/raw/ingenic/ingenic_ecc.c

@@ -30,7 +30,6 @@ int ingenic_ecc_calculate(struct ingenic_ecc *ecc,
 {
 	return ecc->ops->calculate(ecc, params, buf, ecc_code);
 }
-EXPORT_SYMBOL(ingenic_ecc_calculate);
 
 /**
  * ingenic_ecc_correct() - detect and correct bit errors
@@ -51,7 +50,6 @@ int ingenic_ecc_correct(struct ingenic_ecc *ecc,
 {
 	return ecc->ops->correct(ecc, params, buf, ecc_code);
 }
-EXPORT_SYMBOL(ingenic_ecc_correct);
 
 /**
  * ingenic_ecc_get() - get the ECC controller device
@@ -111,7 +109,6 @@ struct ingenic_ecc *of_ingenic_ecc_get(struct device_node *of_node)
 	}
 	return ecc;
 }
-EXPORT_SYMBOL(of_ingenic_ecc_get);
 
 /**
  * ingenic_ecc_release() - release the ECC controller device
@@ -122,7 +119,6 @@ void ingenic_ecc_release(struct ingenic_ecc *ecc)
 	clk_disable_unprepare(ecc->clk);
 	put_device(ecc->dev);
 }
-EXPORT_SYMBOL(ingenic_ecc_release);
 
 int ingenic_ecc_probe(struct platform_device *pdev)
 {
@@ -159,8 +155,3 @@ int ingenic_ecc_probe(struct platform_device *pdev)
 	return 0;
 }
 EXPORT_SYMBOL(ingenic_ecc_probe);
-
-MODULE_AUTHOR("Alex Smith <alex@alex-smith.me.uk>");
-MODULE_AUTHOR("Harvey Hunt <harveyhuntnexus@gmail.com>");
-MODULE_DESCRIPTION("Ingenic ECC common driver");
-MODULE_LICENSE("GPL v2");