[PATCH v2 10/15] soc: mediatek: Support reset bit mapping in mmsys driver

[Hsiao Chien Sung]

- Reset ID must starts from 0 and be consecutive, but
  the reset bits in our hardware design is not continuous,
  some bits are left unused, we need a map to solve the problem
- Use old style 1-to-1 mapping if .rst_tb is not defined

Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
---
 drivers/soc/mediatek/mtk-mmsys.c | 9 +++++++++
 drivers/soc/mediatek/mtk-mmsys.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
index 3a81ef2bcc3c..13249658721f 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -314,6 +314,15 @@ static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned l
 	u32 offset;
 	u32 reg;

+	if (mmsys->data->rst_tb) {
+		if (id >= mmsys->data->num_resets) {
+			dev_err(rcdev->dev, "Invalid reset ID: %lu (>=%u)\n",
+				id, mmsys->data->num_resets);
+			return -EINVAL;
+		}
+		id = mmsys->data->rst_tb[id];
+	}
+
 	offset = (id / MMSYS_SW_RESET_PER_REG) * sizeof(u32);
 	id = id % MMSYS_SW_RESET_PER_REG;
 	reg = mmsys->data->sw0_rst_offset + offset;
diff --git a/drivers/soc/mediatek/mtk-mmsys.h b/drivers/soc/mediatek/mtk-mmsys.h
index e4ab46017430..e18b355527de 100644
--- a/drivers/soc/mediatek/mtk-mmsys.h
+++ b/drivers/soc/mediatek/mtk-mmsys.h
@@ -119,6 +119,7 @@ struct mtk_mmsys_driver_data {
 	const struct mtk_mmsys_routes *routes;
 	const unsigned int num_routes;
 	const u16 sw0_rst_offset;
+	const u8 *rst_tb;
 	const u32 num_resets;
 	const bool is_vppsys;
 	const u8 vsync_len;
--
2.18.0