[PATCH v4 2/7] soc: mediatek: devapc: get 'vio_idx_num' info from DT

[Nina Wu <nina-cm.wu@xxxxxxxxxxxx>]

From: Nina Wu <Nina-CM.Wu@xxxxxxxxxxxx>

For new ICs, there are multiple devapc HWs for different subsys.
The number of devices controlled by each devapc (i.e. 'vio_idx_num')
will be set in DT for per devapc node.
On the other hand, for old ICs which have only one devapc HW, the
'vio_idx_num' info is set in compatible data.
To be backward compatible, the 'vio_idx_num' in compatible data is set
as the default value. Only when the default value is 0 will we get the
'vio_idx_num' from DT.

Signed-off-by: Nina Wu <Nina-CM.Wu@xxxxxxxxxxxx>
---
 drivers/soc/mediatek/mtk-devapc.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-devapc.c b/drivers/soc/mediatek/mtk-devapc.c
index f1cea04..71643d1 100644
--- a/drivers/soc/mediatek/mtk-devapc.c
+++ b/drivers/soc/mediatek/mtk-devapc.c
@@ -32,7 +32,7 @@ struct mtk_devapc_vio_dbgs {
 };
 
 struct mtk_devapc_data {
-	/* numbers of violation index */
+	/* default numbers of violation index */
 	u32 vio_idx_num;
 
 	/* reg offset */
@@ -51,6 +51,9 @@ struct mtk_devapc_context {
 	void __iomem *infra_base;
 	struct clk *infra_clk;
 	const struct mtk_devapc_data *data;
+
+	/* numbers of violation index */
+	u32 vio_idx_num;
 };
 
 static void clear_vio_status(struct mtk_devapc_context *ctx)
@@ -60,10 +63,10 @@ static void clear_vio_status(struct mtk_devapc_context *ctx)
 
 	reg = ctx->infra_base + ctx->data->vio_sta_offset;
 
-	for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->data->vio_idx_num) - 1; i++)
+	for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->vio_idx_num) - 1; i++)
 		writel(GENMASK(31, 0), reg + 4 * i);
 
-	writel(GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1, 0),
+	writel(GENMASK(VIO_MOD_TO_REG_OFF(ctx->vio_idx_num) - 1, 0),
 	       reg + 4 * i);
 }
 
@@ -80,15 +83,15 @@ static void mask_module_irq(struct mtk_devapc_context *ctx, bool mask)
 	else
 		val = 0;
 
-	for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->data->vio_idx_num) - 1; i++)
+	for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->vio_idx_num) - 1; i++)
 		writel(val, reg + 4 * i);
 
 	val = readl(reg + 4 * i);
 	if (mask)
-		val |= GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1,
+		val |= GENMASK(VIO_MOD_TO_REG_OFF(ctx->vio_idx_num) - 1,
 			       0);
 	else
-		val &= ~GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1,
+		val &= ~GENMASK(VIO_MOD_TO_REG_OFF(ctx->vio_idx_num) - 1,
 				0);
 
 	writel(val, reg + 4 * i);
@@ -256,6 +259,16 @@ static int mtk_devapc_probe(struct platform_device *pdev)
 	if (!ctx->infra_base)
 		return -EINVAL;
 
+	/* Set vio_idx_num to default value.
+	 * If the value is 0, get the info from DT.
+	 */
+	ctx->vio_idx_num = ctx->data->vio_idx_num;
+	if (!ctx->vio_idx_num)
+		if (of_property_read_u32(node,
+					 "vio-idx-num",
+					 &ctx->vio_idx_num))
+			return -EINVAL;
+
 	devapc_irq = irq_of_parse_and_map(node, 0);
 	if (!devapc_irq)
 		return -EINVAL;
-- 
2.6.4