drivers: ddr: fsl: fix unused-const-variable warnings

Depending on DDR configuration, gcc-6.x will show up unused-const-
variable messages. Use __maybe_unused specifier for all dynamic_odt
variable definitions to remove these warnings.

Memory footprint will not increase as gcc will optimize out unused
constants.

Signed-off-by: Thomas Schaefer <thomas.schaefer@kontron.com>
Signed-off-by: York Sun <york.sun@nxp.com>

drivers/ddr/fsl/options.c

@@ -33,7 +33,7 @@ struct dynamic_odt {
 /* Quad rank is not verified yet due availability.
  * Replacing 20 OHM with 34 OHM since DDR4 doesn't have 20 OHM option
  */
-static const struct dynamic_odt single_Q[4] = {
+static __maybe_unused const struct dynamic_odt single_Q[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS_AND_OTHER_DIMM,
@@ -60,7 +60,7 @@ static const struct dynamic_odt single_Q[4] = {
 	}
 };
 
-static const struct dynamic_odt single_D[4] = {
+static __maybe_unused const struct dynamic_odt single_D[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -77,7 +77,7 @@ static const struct dynamic_odt single_D[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt single_S[4] = {
+static __maybe_unused const struct dynamic_odt single_S[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -89,7 +89,7 @@ static const struct dynamic_odt single_S[4] = {
 	{0, 0, 0, 0},
 };
 
-static const struct dynamic_odt dual_DD[4] = {
+static __maybe_unused const struct dynamic_odt dual_DD[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_SAME_DIMM,
@@ -116,7 +116,7 @@ static const struct dynamic_odt dual_DD[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_DS[4] = {
+static __maybe_unused const struct dynamic_odt dual_DS[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_SAME_DIMM,
@@ -137,7 +137,7 @@ static const struct dynamic_odt dual_DS[4] = {
 	},
 	{0, 0, 0, 0}
 };
-static const struct dynamic_odt dual_SD[4] = {
+static __maybe_unused const struct dynamic_odt dual_SD[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_ALL,
@@ -159,7 +159,7 @@ static const struct dynamic_odt dual_SD[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_SS[4] = {
+static __maybe_unused const struct dynamic_odt dual_SS[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_ALL,
@@ -176,7 +176,7 @@ static const struct dynamic_odt dual_SS[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_D0[4] = {
+static __maybe_unused const struct dynamic_odt dual_D0[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_SAME_DIMM,
@@ -193,7 +193,7 @@ static const struct dynamic_odt dual_D0[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_0D[4] = {
+static __maybe_unused const struct dynamic_odt dual_0D[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{	/* cs2 */
@@ -210,7 +210,7 @@ static const struct dynamic_odt dual_0D[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_S0[4] = {
+static __maybe_unused const struct dynamic_odt dual_S0[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS,
@@ -223,7 +223,7 @@ static const struct dynamic_odt dual_S0[4] = {
 
 };
 
-static const struct dynamic_odt dual_0S[4] = {
+static __maybe_unused const struct dynamic_odt dual_0S[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{	/* cs2 */
@@ -236,7 +236,7 @@ static const struct dynamic_odt dual_0S[4] = {
 
 };
 
-static const struct dynamic_odt odt_unknown[4] = {
+static __maybe_unused const struct dynamic_odt odt_unknown[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS,
@@ -263,7 +263,7 @@ static const struct dynamic_odt odt_unknown[4] = {
 	}
 };
 #elif defined(CONFIG_SYS_FSL_DDR3)
-static const struct dynamic_odt single_Q[4] = {
+static __maybe_unused const struct dynamic_odt single_Q[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS_AND_OTHER_DIMM,
@@ -290,7 +290,7 @@ static const struct dynamic_odt single_Q[4] = {
 	}
 };
 
-static const struct dynamic_odt single_D[4] = {
+static __maybe_unused const struct dynamic_odt single_D[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -307,7 +307,7 @@ static const struct dynamic_odt single_D[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt single_S[4] = {
+static __maybe_unused const struct dynamic_odt single_S[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -319,7 +319,7 @@ static const struct dynamic_odt single_S[4] = {
 	{0, 0, 0, 0},
 };
 
-static const struct dynamic_odt dual_DD[4] = {
+static __maybe_unused const struct dynamic_odt dual_DD[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_SAME_DIMM,
@@ -346,7 +346,7 @@ static const struct dynamic_odt dual_DD[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_DS[4] = {
+static __maybe_unused const struct dynamic_odt dual_DS[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_SAME_DIMM,
@@ -367,7 +367,7 @@ static const struct dynamic_odt dual_DS[4] = {
 	},
 	{0, 0, 0, 0}
 };
-static const struct dynamic_odt dual_SD[4] = {
+static __maybe_unused const struct dynamic_odt dual_SD[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_ALL,
@@ -389,7 +389,7 @@ static const struct dynamic_odt dual_SD[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_SS[4] = {
+static __maybe_unused const struct dynamic_odt dual_SS[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_ALL,
@@ -406,7 +406,7 @@ static const struct dynamic_odt dual_SS[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_D0[4] = {
+static __maybe_unused const struct dynamic_odt dual_D0[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_SAME_DIMM,
@@ -423,7 +423,7 @@ static const struct dynamic_odt dual_D0[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_0D[4] = {
+static __maybe_unused const struct dynamic_odt dual_0D[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{	/* cs2 */
@@ -440,7 +440,7 @@ static const struct dynamic_odt dual_0D[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_S0[4] = {
+static __maybe_unused const struct dynamic_odt dual_S0[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS,
@@ -453,7 +453,7 @@ static const struct dynamic_odt dual_S0[4] = {
 
 };
 
-static const struct dynamic_odt dual_0S[4] = {
+static __maybe_unused const struct dynamic_odt dual_0S[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{	/* cs2 */
@@ -466,7 +466,7 @@ static const struct dynamic_odt dual_0S[4] = {
 
 };
 
-static const struct dynamic_odt odt_unknown[4] = {
+static __maybe_unused const struct dynamic_odt odt_unknown[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS,
@@ -493,14 +493,14 @@ static const struct dynamic_odt odt_unknown[4] = {
 	}
 };
 #else	/* CONFIG_SYS_FSL_DDR3 */
-static const struct dynamic_odt single_Q[4] = {
+static __maybe_unused const struct dynamic_odt single_Q[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt single_D[4] = {
+static __maybe_unused const struct dynamic_odt single_D[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -517,7 +517,7 @@ static const struct dynamic_odt single_D[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt single_S[4] = {
+static __maybe_unused const struct dynamic_odt single_S[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -529,7 +529,7 @@ static const struct dynamic_odt single_S[4] = {
 	{0, 0, 0, 0},
 };
 
-static const struct dynamic_odt dual_DD[4] = {
+static __maybe_unused const struct dynamic_odt dual_DD[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_OTHER_DIMM,
@@ -556,7 +556,7 @@ static const struct dynamic_odt dual_DD[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_DS[4] = {
+static __maybe_unused const struct dynamic_odt dual_DS[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_OTHER_DIMM,
@@ -578,7 +578,7 @@ static const struct dynamic_odt dual_DS[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_SD[4] = {
+static __maybe_unused const struct dynamic_odt dual_SD[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_OTHER_DIMM,
@@ -600,7 +600,7 @@ static const struct dynamic_odt dual_SD[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_SS[4] = {
+static __maybe_unused const struct dynamic_odt dual_SS[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_OTHER_DIMM,
 		FSL_DDR_ODT_OTHER_DIMM,
@@ -617,7 +617,7 @@ static const struct dynamic_odt dual_SS[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_D0[4] = {
+static __maybe_unused const struct dynamic_odt dual_D0[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_ALL,
@@ -634,7 +634,7 @@ static const struct dynamic_odt dual_D0[4] = {
 	{0, 0, 0, 0}
 };
 
-static const struct dynamic_odt dual_0D[4] = {
+static __maybe_unused const struct dynamic_odt dual_0D[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{	/* cs2 */
@@ -651,7 +651,7 @@ static const struct dynamic_odt dual_0D[4] = {
 	}
 };
 
-static const struct dynamic_odt dual_S0[4] = {
+static __maybe_unused const struct dynamic_odt dual_S0[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS,
@@ -664,7 +664,7 @@ static const struct dynamic_odt dual_S0[4] = {
 
 };
 
-static const struct dynamic_odt dual_0S[4] = {
+static __maybe_unused const struct dynamic_odt dual_0S[4] = {
 	{0, 0, 0, 0},
 	{0, 0, 0, 0},
 	{	/* cs2 */
@@ -677,7 +677,7 @@ static const struct dynamic_odt dual_0S[4] = {
 
 };
 
-static const struct dynamic_odt odt_unknown[4] = {
+static __maybe_unused const struct dynamic_odt odt_unknown[4] = {
 	{	/* cs0 */
 		FSL_DDR_ODT_NEVER,
 		FSL_DDR_ODT_CS,