soc: mediatek: mtk-svs: Build bank name string dynamically

In svs_bank_resource_setup() there is a "big" switch assigning different
names depending on sw_id and type and this will surely grow: for example
MT8186 has got a two-line type (high/low) SVS bank for CPU_BIG, and this
would require more switch nesting.

Simplify all of this by changing that to a devm_kasprintf() call that
will concatenate the SW_ID string (e.g. SVSB_CPU_LITTLE) with the Type
string (e.g. _LOW), resulting in the expected full bank name (e.g.
SVSB_CPU_LITTLE_LOW).

This being a dynamic allocation can be slower, but this happens only
once in the life of this driver and it's not a performance path, so it's
totally acceptable.

Link: https://lore.kernel.org/r/20231121125044.78642-5-angelogioacchino.delregno@collabora.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

drivers/soc/mediatek/mtk-svs.c

@@ -332,6 +332,14 @@ static const u32 svs_regs_v2[] = {
 	[THSLPEVEB]		= 0x330,
 };
 
+static const char * const svs_swid_names[SVSB_SWID_MAX] = {
+	"SVSB_CPU_LITTLE", "SVSB_CPU_BIG", "SVSB_CCI", "SVSB_GPU"
+};
+
+static const char * const svs_type_names[SVSB_TYPE_MAX] = {
+	"", "_LOW", "_HIGH"
+};
+
 /**
  * struct svs_platform - svs platform control
  * @base: svs platform register base
@@ -1696,34 +1704,21 @@ static int svs_bank_resource_setup(struct svs_platform *svsp)
 	for (idx = 0; idx < svsp->bank_max; idx++) {
 		svsb = &svsp->banks[idx];
 
-		switch (svsb->sw_id) {
-		case SVSB_SWID_CPU_LITTLE:
-			svsb->name = "SVSB_CPU_LITTLE";
-			break;
-		case SVSB_SWID_CPU_BIG:
-			svsb->name = "SVSB_CPU_BIG";
-			break;
-		case SVSB_SWID_CCI:
-			svsb->name = "SVSB_CCI";
-			break;
-		case SVSB_SWID_GPU:
-			if (svsb->type == SVSB_TYPE_HIGH)
-				svsb->name = "SVSB_GPU_HIGH";
-			else if (svsb->type == SVSB_TYPE_LOW)
-				svsb->name = "SVSB_GPU_LOW";
-			else
-				svsb->name = "SVSB_GPU";
-			break;
-		default:
-			dev_err(svsb->dev, "unknown sw_id: %u\n", svsb->sw_id);
+		if (svsb->sw_id >= SVSB_SWID_MAX || svsb->type >= SVSB_TYPE_MAX) {
+			dev_err(svsb->dev, "unknown bank sw_id or type\n");
 			return -EINVAL;
 		}
 
-		svsb->dev = devm_kzalloc(svsp->dev, sizeof(*svsb->dev),
-					 GFP_KERNEL);
+		svsb->dev = devm_kzalloc(svsp->dev, sizeof(*svsb->dev), GFP_KERNEL);
 		if (!svsb->dev)
 			return -ENOMEM;
 
+		svsb->name = devm_kasprintf(svsp->dev, GFP_KERNEL, "%s%s",
+					    svs_swid_names[svsb->sw_id],
+					    svs_type_names[svsb->type]);
+		if (!svsb->name)
+			return -ENOMEM;
+
 		ret = dev_set_name(svsb->dev, "%s", svsb->name);
 		if (ret)
 			return ret;