NAND: TI: fix warnings in omap_gpmc.c

The following warnings are reported for boards using SOFT ECC.

omap_gpmc.c:33:30: warning: 'hw_nand_oob' defined but not used
omap_gpmc.c:78:13: warning: 'omap_hwecc_init' defined but not used
omap_gpmc.c:116:12: warning: 'omap_correct_data' defined but not used
omap_gpmc.c:182:12: warning: 'omap_calculate_ecc' defined but not used
omap_gpmc.c:208:13: warning: 'omap_enable_hwecc' defined but not used

Signed-off-by: Stefano Babic <sbabic@denx.de>
Cc: Tom Rini <trini@ti.com>
Cc: Scott Wood <scottwood@freescale.com>

drivers/mtd/nand/omap_gpmc.c

@@ -27,10 +27,12 @@
 #include <asm/arch/mem.h>
 #include <asm/arch/omap_gpmc.h>
 #include <linux/mtd/nand_ecc.h>
+#include <linux/compiler.h>
 #include <nand.h>
 
 static uint8_t cs;
-static struct nand_ecclayout hw_nand_oob = GPMC_NAND_HW_ECC_LAYOUT;
+static __maybe_unused struct nand_ecclayout hw_nand_oob =
+	GPMC_NAND_HW_ECC_LAYOUT;
 
 /*
  * omap_nand_hwcontrol - Set the address pointers corretly for the
@@ -75,7 +77,7 @@ int omap_spl_dev_ready(struct mtd_info *mtd)
  * @mtd:        MTD device structure
  *
  */
-static void omap_hwecc_init(struct nand_chip *chip)
+static void __maybe_unused omap_hwecc_init(struct nand_chip *chip)
 {
 	/*
 	 * Init ECC Control Register
@@ -113,7 +115,7 @@ static uint32_t gen_true_ecc(uint8_t *ecc_buf)
  *
  * @return 0 if data is OK or corrected, else returns -1
  */
-static int omap_correct_data(struct mtd_info *mtd, uint8_t *dat,
+static int __maybe_unused omap_correct_data(struct mtd_info *mtd, uint8_t *dat,
 				uint8_t *read_ecc, uint8_t *calc_ecc)
 {
 	uint32_t orig_ecc, new_ecc, res, hm;
@@ -179,8 +181,8 @@ static int omap_correct_data(struct mtd_info *mtd, uint8_t *dat,
  *  @dat:	unused
  *  @ecc_code:	ecc_code buffer
  */
-static int omap_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat,
-				uint8_t *ecc_code)
+static int __maybe_unused omap_calculate_ecc(struct mtd_info *mtd,
+		const uint8_t *dat, uint8_t *ecc_code)
 {
 	u_int32_t val;
 
@@ -205,7 +207,7 @@ static int omap_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat,
  * @mtd:        MTD device structure
  * @mode:       Read/Write mode
  */
-static void omap_enable_hwecc(struct mtd_info *mtd, int32_t mode)
+static void __maybe_unused omap_enable_hwecc(struct mtd_info *mtd, int32_t mode)
 {
 	struct nand_chip *chip = mtd->priv;
 	uint32_t val, dev_width = (chip->options & NAND_BUSWIDTH_16) >> 1;