regmap: mmio: Remove unused 64-bit support code

regmap API does not support 64-bit data size, so
there is no point to have it in regmap MMIO.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230622183613.58762-4-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap-mmio.c

@@ -202,15 +202,6 @@ static int regmap_mmio_noinc_write(void *context, unsigned int reg,
 				writel(swab32(valp[i]), ctx->regs + reg);
 			goto out_clk;
 		}
-#ifdef CONFIG_64BIT
-		case 8:
-		{
-			const u64 *valp = (const u64 *)val;
-			for (i = 0; i < val_count; i++)
-				writeq(swab64(valp[i]), ctx->regs + reg);
-			goto out_clk;
-		}
-#endif
 		default:
 			ret = -EINVAL;
 			goto out_clk;
@@ -227,11 +218,6 @@ static int regmap_mmio_noinc_write(void *context, unsigned int reg,
 	case 4:
 		writesl(ctx->regs + reg, (const u32 *)val, val_count);
 		break;
-#ifdef CONFIG_64BIT
-	case 8:
-		writesq(ctx->regs + reg, (const u64 *)val, val_count);
-		break;
-#endif
 	default:
 		ret = -EINVAL;
 		break;
@@ -363,11 +349,6 @@ static int regmap_mmio_noinc_read(void *context, unsigned int reg,
 	case 4:
 		readsl(ctx->regs + reg, (u32 *)val, val_count);
 		break;
-#ifdef CONFIG_64BIT
-	case 8:
-		readsq(ctx->regs + reg, (u64 *)val, val_count);
-		break;
-#endif
 	default:
 		ret = -EINVAL;
 		goto out_clk;
@@ -387,11 +368,6 @@ static int regmap_mmio_noinc_read(void *context, unsigned int reg,
 		case 4:
 			swab32_array(val, val_count);
 			break;
-#ifdef CONFIG_64BIT
-		case 8:
-			swab64_array(val, val_count);
-			break;
-#endif
 		default:
 			ret = -EINVAL;
 			break;