Provide a mtk_mmsys_ddp_connect() and mtk_mmsys_disconnect() functions to
replace mtk_ddp_add_comp_to_path() and mtk_ddp_remove_comp_from_path().
Those functions will allow DRM driver and others to control the data
path routing.

Signed-off-by: Enric Balletbo i Serra <redacted>
---

Changes in v10:
- Introduced a new patch to move routing control into mmsys driver.
- Removed the patch to use regmap as is not needed anymore.

Changes in v9: None
Changes in v8: None
Changes in v7: None

 drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  13 +-
 drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 256 ----------------------
 drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |   7 -
 drivers/gpu/drm/mediatek/mtk_drm_drv.c  |  13 +-
 drivers/soc/mediatek/mtk-mmsys.c        | 275 ++++++++++++++++++++++++
 include/linux/soc/mediatek/mtk-mmsys.h  |  19 ++
 6 files changed, 306 insertions(+), 277 deletions(-)
 create mode 100644 include/linux/soc/mediatek/mtk-mmsys.h

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index fd4042de12f2..3c89449bea6e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c

@@ -6,6 +6,7 @@
 #include <linux/clk.h>
 #include <linux/pm_runtime.h>
 #include <linux/soc/mediatek/mtk-cmdq.h>
+#include <linux/soc/mediatek/mtk-mmsys.h>
 
 #include <asm/barrier.h>
 #include <soc/mediatek/smi.h>

@@ -296,9 +297,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 	}
 
 	for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
-		mtk_ddp_add_comp_to_path(mtk_crtc->config_regs,
-					 mtk_crtc->ddp_comp[i]->id,
-					 mtk_crtc->ddp_comp[i + 1]->id);
+		mtk_mmsys_ddp_connect(mtk_crtc->config_regs,
+				      mtk_crtc->ddp_comp[i]->id,
+				      mtk_crtc->ddp_comp[i + 1]->id);

 		mtk_disp_mutex_add_comp(mtk_crtc->mutex,
 					mtk_crtc->ddp_comp[i]->id);
 	}

@@ -355,9 +356,9 @@ static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
 					   mtk_crtc->ddp_comp[i]->id);
 	mtk_disp_mutex_disable(mtk_crtc->mutex);
 	for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
-		mtk_ddp_remove_comp_from_path(mtk_crtc->config_regs,
-					      mtk_crtc->ddp_comp[i]->id,
-					      mtk_crtc->ddp_comp[i + 1]->id);
+		mtk_mmsys_ddp_disconnect(mtk_crtc->config_regs,
+					 mtk_crtc->ddp_comp[i]->id,
+					 mtk_crtc->ddp_comp[i + 1]->id);
 		mtk_disp_mutex_remove_comp(mtk_crtc->mutex,
 					   mtk_crtc->ddp_comp[i]->id);
 	}

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
index b885f60f474c..014c1bbe1df2 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c

@@ -13,26 +13,6 @@
 #include "mtk_drm_ddp.h"
 #include "mtk_drm_ddp_comp.h"
 

diff --git a/include/linux/soc/mediatek/mtk-mmsys.h b/include/linux/soc/mediatek/mtk-mmsys.h
new file mode 100644
index 000000000000..02fd86e62a8d
--- /dev/null
+++ b/include/linux/soc/mediatek/mtk-mmsys.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ */
+
+#ifndef __MTK_MMSYS_H
+#define __MTK_MMSYS_H
+
+enum mtk_ddp_comp_id;
+
+void mtk_mmsys_ddp_connect(void __iomem *config_regs,