Re: [PATCH v11 4/5] soc / drm: mediatek: Move routing control to mmsys device

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Hi, Enric:

On Mon, 2020-03-02 at 12:01 +0100, Enric Balletbo i Serra wrote:
> 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.
> 

Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx>

But what is the base of this series? When I apply this patch to 5.6-rc1,
some error happen, the apply --reject result is

In drivers/gpu/drm/mediatek/mtk_drm_crtc.c.rej

diff a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c        (rejected hunks)
@@ -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->mmsys_dev,
+                                     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);
        }

I's trivial for me to fix this conflicts, so you have better to notice
what is the base of this series in cover latter.

Regards,
CK


> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> ---
> 
> Changes in v11:
> - Select CONFIG_MTK_MMSYS (CK)
> - Pass device pointer of mmsys device instead of config regs (CK)
> 
> 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/Kconfig        |   1 +
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  19 +-
>  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  |  14 +-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h  |   2 +-
>  drivers/soc/mediatek/mtk-mmsys.c        | 277 ++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-mmsys.h  |  20 ++
>  8 files changed, 314 insertions(+), 282 deletions(-)
>  create mode 100644 include/linux/soc/mediatek/mtk-mmsys.h
> 
> diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
> index fa5ffc4fe823..c420f5a3d33b 100644
> --- a/drivers/gpu/drm/mediatek/Kconfig
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -11,6 +11,7 @@ config DRM_MEDIATEK
>  	select DRM_MIPI_DSI
>  	select DRM_PANEL
>  	select MEMORY
> +	select MTK_MMSYS
>  	select MTK_SMI
>  	select VIDEOMODE_HELPERS
>  	help
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index fd4042de12f2..f63a885e063c 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>
> @@ -28,7 +29,7 @@
>   * @enabled: records whether crtc_enable succeeded
>   * @planes: array of 4 drm_plane structures, one for each overlay plane
>   * @pending_planes: whether any plane has pending changes to be applied
> - * @config_regs: memory mapped mmsys configuration register space
> + * @mmsys_dev: pointer to the mmsys device for configuration registers
>   * @mutex: handle to one of the ten disp_mutex streams
>   * @ddp_comp_nr: number of components in ddp_comp
>   * @ddp_comp: array of pointers the mtk_ddp_comp structures used by this crtc
> @@ -50,7 +51,7 @@ struct mtk_drm_crtc {
>  	u32				cmdq_event;
>  #endif
>  
> -	void __iomem			*config_regs;
> +	struct device			*mmsys_dev;
>  	struct mtk_disp_mutex		*mutex;
>  	unsigned int			ddp_comp_nr;
>  	struct mtk_ddp_comp		**ddp_comp;
> @@ -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->mmsys_dev,
> +				      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->mmsys_dev,
> +					 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);
>  	}
> @@ -758,7 +759,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>  	if (!mtk_crtc)
>  		return -ENOMEM;
>  
> -	mtk_crtc->config_regs = priv->config_regs;
> +	mtk_crtc->mmsys_dev = priv->mmsys_dev;
>  	mtk_crtc->ddp_comp_nr = path_len;
>  	mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
>  						sizeof(*mtk_crtc->ddp_comp),
> 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"
>  
> -#define DISP_REG_CONFIG_DISP_OVL0_MOUT_EN	0x040
> -#define DISP_REG_CONFIG_DISP_OVL1_MOUT_EN	0x044
> -#define DISP_REG_CONFIG_DISP_OD_MOUT_EN		0x048
> -#define DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN	0x04c
> -#define DISP_REG_CONFIG_DISP_UFOE_MOUT_EN	0x050
> -#define DISP_REG_CONFIG_DISP_COLOR0_SEL_IN	0x084
> -#define DISP_REG_CONFIG_DISP_COLOR1_SEL_IN	0x088
> -#define DISP_REG_CONFIG_DSIE_SEL_IN		0x0a4
> -#define DISP_REG_CONFIG_DSIO_SEL_IN		0x0a8
> -#define DISP_REG_CONFIG_DPI_SEL_IN		0x0ac
> -#define DISP_REG_CONFIG_DISP_RDMA2_SOUT		0x0b8
> -#define DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN	0x0c4
> -#define DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN	0x0c8
> -#define DISP_REG_CONFIG_MMSYS_CG_CON0		0x100
> -
> -#define DISP_REG_CONFIG_DISP_OVL_MOUT_EN	0x030
> -#define DISP_REG_CONFIG_OUT_SEL			0x04c
> -#define DISP_REG_CONFIG_DSI_SEL			0x050
> -#define DISP_REG_CONFIG_DPI_SEL			0x064
> -
>  #define MT2701_DISP_MUTEX0_MOD0			0x2c
>  #define MT2701_DISP_MUTEX0_SOF0			0x30
>  
> @@ -94,48 +74,6 @@
>  #define MUTEX_SOF_DSI2			5
>  #define MUTEX_SOF_DSI3			6
>  
> -#define OVL0_MOUT_EN_COLOR0		0x1
> -#define OD_MOUT_EN_RDMA0		0x1
> -#define OD1_MOUT_EN_RDMA1		BIT(16)
> -#define UFOE_MOUT_EN_DSI0		0x1
> -#define COLOR0_SEL_IN_OVL0		0x1
> -#define OVL1_MOUT_EN_COLOR1		0x1
> -#define GAMMA_MOUT_EN_RDMA1		0x1
> -#define RDMA0_SOUT_DPI0			0x2
> -#define RDMA0_SOUT_DPI1			0x3
> -#define RDMA0_SOUT_DSI1			0x1
> -#define RDMA0_SOUT_DSI2			0x4
> -#define RDMA0_SOUT_DSI3			0x5
> -#define RDMA1_SOUT_DPI0			0x2
> -#define RDMA1_SOUT_DPI1			0x3
> -#define RDMA1_SOUT_DSI1			0x1
> -#define RDMA1_SOUT_DSI2			0x4
> -#define RDMA1_SOUT_DSI3			0x5
> -#define RDMA2_SOUT_DPI0			0x2
> -#define RDMA2_SOUT_DPI1			0x3
> -#define RDMA2_SOUT_DSI1			0x1
> -#define RDMA2_SOUT_DSI2			0x4
> -#define RDMA2_SOUT_DSI3			0x5
> -#define DPI0_SEL_IN_RDMA1		0x1
> -#define DPI0_SEL_IN_RDMA2		0x3
> -#define DPI1_SEL_IN_RDMA1		(0x1 << 8)
> -#define DPI1_SEL_IN_RDMA2		(0x3 << 8)
> -#define DSI0_SEL_IN_RDMA1		0x1
> -#define DSI0_SEL_IN_RDMA2		0x4
> -#define DSI1_SEL_IN_RDMA1		0x1
> -#define DSI1_SEL_IN_RDMA2		0x4
> -#define DSI2_SEL_IN_RDMA1		(0x1 << 16)
> -#define DSI2_SEL_IN_RDMA2		(0x4 << 16)
> -#define DSI3_SEL_IN_RDMA1		(0x1 << 16)
> -#define DSI3_SEL_IN_RDMA2		(0x4 << 16)
> -#define COLOR1_SEL_IN_OVL1		0x1
> -
> -#define OVL_MOUT_EN_RDMA		0x1
> -#define BLS_TO_DSI_RDMA1_TO_DPI1	0x8
> -#define BLS_TO_DPI_RDMA1_TO_DSI		0x2
> -#define DSI_SEL_IN_BLS			0x0
> -#define DPI_SEL_IN_BLS			0x0
> -#define DSI_SEL_IN_RDMA			0x1
>  
>  struct mtk_disp_mutex {
>  	int id;
> @@ -246,200 +184,6 @@ static const struct mtk_ddp_data mt8173_ddp_driver_data = {
>  	.mutex_sof_reg = MT2701_DISP_MUTEX0_SOF0,
>  };
>  
> -static unsigned int mtk_ddp_mout_en(enum mtk_ddp_comp_id cur,
> -				    enum mtk_ddp_comp_id next,
> -				    unsigned int *addr)
> -{
> -	unsigned int value;
> -
> -	if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
> -		*addr = DISP_REG_CONFIG_DISP_OVL0_MOUT_EN;
> -		value = OVL0_MOUT_EN_COLOR0;
> -	} else if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_RDMA0) {
> -		*addr = DISP_REG_CONFIG_DISP_OVL_MOUT_EN;
> -		value = OVL_MOUT_EN_RDMA;
> -	} else if (cur == DDP_COMPONENT_OD0 && next == DDP_COMPONENT_RDMA0) {
> -		*addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
> -		value = OD_MOUT_EN_RDMA0;
> -	} else if (cur == DDP_COMPONENT_UFOE && next == DDP_COMPONENT_DSI0) {
> -		*addr = DISP_REG_CONFIG_DISP_UFOE_MOUT_EN;
> -		value = UFOE_MOUT_EN_DSI0;
> -	} else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
> -		*addr = DISP_REG_CONFIG_DISP_OVL1_MOUT_EN;
> -		value = OVL1_MOUT_EN_COLOR1;
> -	} else if (cur == DDP_COMPONENT_GAMMA && next == DDP_COMPONENT_RDMA1) {
> -		*addr = DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN;
> -		value = GAMMA_MOUT_EN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_OD1 && next == DDP_COMPONENT_RDMA1) {
> -		*addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
> -		value = OD1_MOUT_EN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DPI0) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> -		value = RDMA0_SOUT_DPI0;
> -	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DPI1) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> -		value = RDMA0_SOUT_DPI1;
> -	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI1) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> -		value = RDMA0_SOUT_DSI1;
> -	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI2) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> -		value = RDMA0_SOUT_DSI2;
> -	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI3) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> -		value = RDMA0_SOUT_DSI3;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI1) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> -		value = RDMA1_SOUT_DSI1;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI2) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> -		value = RDMA1_SOUT_DSI2;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI3) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> -		value = RDMA1_SOUT_DSI3;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> -		value = RDMA1_SOUT_DPI0;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI1) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> -		value = RDMA1_SOUT_DPI1;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI0) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> -		value = RDMA2_SOUT_DPI0;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI1) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> -		value = RDMA2_SOUT_DPI1;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI1) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> -		value = RDMA2_SOUT_DSI1;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI2) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> -		value = RDMA2_SOUT_DSI2;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI3) {
> -		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> -		value = RDMA2_SOUT_DSI3;
> -	} else {
> -		value = 0;
> -	}
> -
> -	return value;
> -}
> -
> -static unsigned int mtk_ddp_sel_in(enum mtk_ddp_comp_id cur,
> -				   enum mtk_ddp_comp_id next,
> -				   unsigned int *addr)
> -{
> -	unsigned int value;
> -
> -	if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
> -		*addr = DISP_REG_CONFIG_DISP_COLOR0_SEL_IN;
> -		value = COLOR0_SEL_IN_OVL0;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> -		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> -		value = DPI0_SEL_IN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI1) {
> -		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> -		value = DPI1_SEL_IN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI0) {
> -		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> -		value = DSI0_SEL_IN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI1) {
> -		*addr = DISP_REG_CONFIG_DSIO_SEL_IN;
> -		value = DSI1_SEL_IN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI2) {
> -		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> -		value = DSI2_SEL_IN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI3) {
> -		*addr = DISP_REG_CONFIG_DSIO_SEL_IN;
> -		value = DSI3_SEL_IN_RDMA1;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI0) {
> -		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> -		value = DPI0_SEL_IN_RDMA2;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI1) {
> -		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> -		value = DPI1_SEL_IN_RDMA2;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI0) {
> -		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> -		value = DSI0_SEL_IN_RDMA2;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI1) {
> -		*addr = DISP_REG_CONFIG_DSIO_SEL_IN;
> -		value = DSI1_SEL_IN_RDMA2;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI2) {
> -		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> -		value = DSI2_SEL_IN_RDMA2;
> -	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI3) {
> -		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> -		value = DSI3_SEL_IN_RDMA2;
> -	} else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
> -		*addr = DISP_REG_CONFIG_DISP_COLOR1_SEL_IN;
> -		value = COLOR1_SEL_IN_OVL1;
> -	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0) {
> -		*addr = DISP_REG_CONFIG_DSI_SEL;
> -		value = DSI_SEL_IN_BLS;
> -	} else {
> -		value = 0;
> -	}
> -
> -	return value;
> -}
> -
> -static void mtk_ddp_sout_sel(void __iomem *config_regs,
> -			     enum mtk_ddp_comp_id cur,
> -			     enum mtk_ddp_comp_id next)
> -{
> -	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0) {
> -		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
> -			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> -	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DPI0) {
> -		writel_relaxed(BLS_TO_DPI_RDMA1_TO_DSI,
> -			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> -		writel_relaxed(DSI_SEL_IN_RDMA,
> -			       config_regs + DISP_REG_CONFIG_DSI_SEL);
> -		writel_relaxed(DPI_SEL_IN_BLS,
> -			       config_regs + DISP_REG_CONFIG_DPI_SEL);
> -	}
> -}
> -
> -void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
> -			      enum mtk_ddp_comp_id cur,
> -			      enum mtk_ddp_comp_id next)
> -{
> -	unsigned int addr, value, reg;
> -
> -	value = mtk_ddp_mout_en(cur, next, &addr);
> -	if (value) {
> -		reg = readl_relaxed(config_regs + addr) | value;
> -		writel_relaxed(reg, config_regs + addr);
> -	}
> -
> -	mtk_ddp_sout_sel(config_regs, cur, next);
> -
> -	value = mtk_ddp_sel_in(cur, next, &addr);
> -	if (value) {
> -		reg = readl_relaxed(config_regs + addr) | value;
> -		writel_relaxed(reg, config_regs + addr);
> -	}
> -}
> -
> -void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
> -				   enum mtk_ddp_comp_id cur,
> -				   enum mtk_ddp_comp_id next)
> -{
> -	unsigned int addr, value, reg;
> -
> -	value = mtk_ddp_mout_en(cur, next, &addr);
> -	if (value) {
> -		reg = readl_relaxed(config_regs + addr) & ~value;
> -		writel_relaxed(reg, config_regs + addr);
> -	}
> -
> -	value = mtk_ddp_sel_in(cur, next, &addr);
> -	if (value) {
> -		reg = readl_relaxed(config_regs + addr) & ~value;
> -		writel_relaxed(reg, config_regs + addr);
> -	}
> -}
> -
>  struct mtk_disp_mutex *mtk_disp_mutex_get(struct device *dev, unsigned int id)
>  {
>  	struct mtk_ddp *ddp = dev_get_drvdata(dev);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> index 827be424a148..6b691a57be4a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> @@ -12,13 +12,6 @@ struct regmap;
>  struct device;
>  struct mtk_disp_mutex;
>  
> -void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
> -			      enum mtk_ddp_comp_id cur,
> -			      enum mtk_ddp_comp_id next);
> -void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
> -				   enum mtk_ddp_comp_id cur,
> -				   enum mtk_ddp_comp_id next);
> -
>  struct mtk_disp_mutex *mtk_disp_mutex_get(struct device *dev, unsigned int id);
>  int mtk_disp_mutex_prepare(struct mtk_disp_mutex *mutex);
>  void mtk_disp_mutex_add_comp(struct mtk_disp_mutex *mutex,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 8e2d3cb62ad5..208f9c5256ef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -10,6 +10,7 @@
>  #include <linux/of_address.h>
>  #include <linux/of_platform.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/soc/mediatek/mtk-mmsys.h>
>  #include <linux/dma-mapping.h>
>  
>  #include <drm/drm_atomic.h>
> @@ -425,7 +426,6 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct mtk_drm_private *private;
> -	struct resource *mem;
>  	struct device_node *node;
>  	struct component_match *match = NULL;
>  	int ret;
> @@ -436,14 +436,10 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	private->data = of_device_get_match_data(dev);
> -
> -	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	private->config_regs = devm_ioremap_resource(dev, mem);
> -	if (IS_ERR(private->config_regs)) {
> -		ret = PTR_ERR(private->config_regs);
> -		dev_err(dev, "Failed to ioremap mmsys-config resource: %d\n",
> -			ret);
> -		return ret;
> +	private->mmsys_dev = dev->parent;
> +	if (!private->mmsys_dev) {
> +		dev_err(dev, "Failed to get MMSYS device\n");
> +		return -ENODEV;
>  	}
>  
>  	/* Iterate over sibling DISP function blocks */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index 17bc99b9f5d4..b5be63e53176 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -39,7 +39,7 @@ struct mtk_drm_private {
>  
>  	struct device_node *mutex_node;
>  	struct device *mutex_dev;
> -	void __iomem *config_regs;
> +	struct device *mmsys_dev;
>  	struct device_node *comp_node[DDP_COMPONENT_ID_MAX];
>  	struct mtk_ddp_comp *ddp_comp[DDP_COMPONENT_ID_MAX];
>  	const struct mtk_mmsys_driver_data *data;
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
> index 473cdf732fb5..bb99a05fb278 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -5,14 +5,81 @@
>   */
>  
>  #include <linux/clk-provider.h>
> +#include <linux/device.h>
>  #include <linux/of_device.h>
>  #include <linux/platform_device.h>
> +#include <linux/soc/mediatek/mtk-mmsys.h>
>  
>  #include "../../clk/mediatek/clk-gate.h"
>  #include "../../clk/mediatek/clk-mtk.h"
> +#include "../../gpu/drm/mediatek/mtk_drm_ddp.h"
> +#include "../../gpu/drm/mediatek/mtk_drm_ddp_comp.h"
>  
>  #include <dt-bindings/clock/mt8173-clk.h>
>  
> +#define DISP_REG_CONFIG_DISP_OVL0_MOUT_EN	0x040
> +#define DISP_REG_CONFIG_DISP_OVL1_MOUT_EN	0x044
> +#define DISP_REG_CONFIG_DISP_OD_MOUT_EN		0x048
> +#define DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN	0x04c
> +#define DISP_REG_CONFIG_DISP_UFOE_MOUT_EN	0x050
> +#define DISP_REG_CONFIG_DISP_COLOR0_SEL_IN	0x084
> +#define DISP_REG_CONFIG_DISP_COLOR1_SEL_IN	0x088
> +#define DISP_REG_CONFIG_DSIE_SEL_IN		0x0a4
> +#define DISP_REG_CONFIG_DSIO_SEL_IN		0x0a8
> +#define DISP_REG_CONFIG_DPI_SEL_IN		0x0ac
> +#define DISP_REG_CONFIG_DISP_RDMA2_SOUT		0x0b8
> +#define DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN	0x0c4
> +#define DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN	0x0c8
> +#define DISP_REG_CONFIG_MMSYS_CG_CON0		0x100
> +
> +#define DISP_REG_CONFIG_DISP_OVL_MOUT_EN	0x030
> +#define DISP_REG_CONFIG_OUT_SEL			0x04c
> +#define DISP_REG_CONFIG_DSI_SEL			0x050
> +#define DISP_REG_CONFIG_DPI_SEL			0x064
> +
> +#define OVL0_MOUT_EN_COLOR0			0x1
> +#define OD_MOUT_EN_RDMA0			0x1
> +#define OD1_MOUT_EN_RDMA1			BIT(16)
> +#define UFOE_MOUT_EN_DSI0			0x1
> +#define COLOR0_SEL_IN_OVL0			0x1
> +#define OVL1_MOUT_EN_COLOR1			0x1
> +#define GAMMA_MOUT_EN_RDMA1			0x1
> +#define RDMA0_SOUT_DPI0				0x2
> +#define RDMA0_SOUT_DPI1				0x3
> +#define RDMA0_SOUT_DSI1				0x1
> +#define RDMA0_SOUT_DSI2				0x4
> +#define RDMA0_SOUT_DSI3				0x5
> +#define RDMA1_SOUT_DPI0				0x2
> +#define RDMA1_SOUT_DPI1				0x3
> +#define RDMA1_SOUT_DSI1				0x1
> +#define RDMA1_SOUT_DSI2				0x4
> +#define RDMA1_SOUT_DSI3				0x5
> +#define RDMA2_SOUT_DPI0				0x2
> +#define RDMA2_SOUT_DPI1				0x3
> +#define RDMA2_SOUT_DSI1				0x1
> +#define RDMA2_SOUT_DSI2				0x4
> +#define RDMA2_SOUT_DSI3				0x5
> +#define DPI0_SEL_IN_RDMA1			0x1
> +#define DPI0_SEL_IN_RDMA2			0x3
> +#define DPI1_SEL_IN_RDMA1			(0x1 << 8)
> +#define DPI1_SEL_IN_RDMA2			(0x3 << 8)
> +#define DSI0_SEL_IN_RDMA1			0x1
> +#define DSI0_SEL_IN_RDMA2			0x4
> +#define DSI1_SEL_IN_RDMA1			0x1
> +#define DSI1_SEL_IN_RDMA2			0x4
> +#define DSI2_SEL_IN_RDMA1			(0x1 << 16)
> +#define DSI2_SEL_IN_RDMA2			(0x4 << 16)
> +#define DSI3_SEL_IN_RDMA1			(0x1 << 16)
> +#define DSI3_SEL_IN_RDMA2			(0x4 << 16)
> +#define COLOR1_SEL_IN_OVL1			0x1
> +
> +#define OVL_MOUT_EN_RDMA			0x1
> +#define BLS_TO_DSI_RDMA1_TO_DPI1		0x8
> +#define BLS_TO_DPI_RDMA1_TO_DSI			0x2
> +#define DSI_SEL_IN_BLS				0x0
> +#define DPI_SEL_IN_BLS				0x0
> +#define DSI_SEL_IN_RDMA				0x1
> +
>  static const struct mtk_gate_regs mm0_cg_regs = {
>  	.set_ofs = 0x0104,
>  	.clr_ofs = 0x0108,
> @@ -110,13 +177,223 @@ static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
>  	.gates_num = ARRAY_SIZE(mt8173_mm_clks),
>  };
>  
> +static unsigned int mtk_mmsys_ddp_mout_en(enum mtk_ddp_comp_id cur,
> +					  enum mtk_ddp_comp_id next,
> +					  unsigned int *addr)
> +{
> +	unsigned int value;
> +
> +	if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
> +		*addr = DISP_REG_CONFIG_DISP_OVL0_MOUT_EN;
> +		value = OVL0_MOUT_EN_COLOR0;
> +	} else if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_RDMA0) {
> +		*addr = DISP_REG_CONFIG_DISP_OVL_MOUT_EN;
> +		value = OVL_MOUT_EN_RDMA;
> +	} else if (cur == DDP_COMPONENT_OD0 && next == DDP_COMPONENT_RDMA0) {
> +		*addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
> +		value = OD_MOUT_EN_RDMA0;
> +	} else if (cur == DDP_COMPONENT_UFOE && next == DDP_COMPONENT_DSI0) {
> +		*addr = DISP_REG_CONFIG_DISP_UFOE_MOUT_EN;
> +		value = UFOE_MOUT_EN_DSI0;
> +	} else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
> +		*addr = DISP_REG_CONFIG_DISP_OVL1_MOUT_EN;
> +		value = OVL1_MOUT_EN_COLOR1;
> +	} else if (cur == DDP_COMPONENT_GAMMA && next == DDP_COMPONENT_RDMA1) {
> +		*addr = DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN;
> +		value = GAMMA_MOUT_EN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_OD1 && next == DDP_COMPONENT_RDMA1) {
> +		*addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
> +		value = OD1_MOUT_EN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DPI0) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> +		value = RDMA0_SOUT_DPI0;
> +	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DPI1) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> +		value = RDMA0_SOUT_DPI1;
> +	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI1) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> +		value = RDMA0_SOUT_DSI1;
> +	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI2) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> +		value = RDMA0_SOUT_DSI2;
> +	} else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI3) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA0_SOUT_EN;
> +		value = RDMA0_SOUT_DSI3;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI1) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> +		value = RDMA1_SOUT_DSI1;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI2) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> +		value = RDMA1_SOUT_DSI2;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI3) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> +		value = RDMA1_SOUT_DSI3;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> +		value = RDMA1_SOUT_DPI0;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI1) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA1_SOUT_EN;
> +		value = RDMA1_SOUT_DPI1;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI0) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> +		value = RDMA2_SOUT_DPI0;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI1) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> +		value = RDMA2_SOUT_DPI1;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI1) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> +		value = RDMA2_SOUT_DSI1;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI2) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> +		value = RDMA2_SOUT_DSI2;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI3) {
> +		*addr = DISP_REG_CONFIG_DISP_RDMA2_SOUT;
> +		value = RDMA2_SOUT_DSI3;
> +	} else {
> +		value = 0;
> +	}
> +
> +	return value;
> +}
> +
> +static unsigned int mtk_mmsys_ddp_sel_in(enum mtk_ddp_comp_id cur,
> +					 enum mtk_ddp_comp_id next,
> +					 unsigned int *addr)
> +{
> +	unsigned int value;
> +
> +	if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
> +		*addr = DISP_REG_CONFIG_DISP_COLOR0_SEL_IN;
> +		value = COLOR0_SEL_IN_OVL0;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> +		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> +		value = DPI0_SEL_IN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI1) {
> +		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> +		value = DPI1_SEL_IN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI0) {
> +		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> +		value = DSI0_SEL_IN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI1) {
> +		*addr = DISP_REG_CONFIG_DSIO_SEL_IN;
> +		value = DSI1_SEL_IN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI2) {
> +		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> +		value = DSI2_SEL_IN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI3) {
> +		*addr = DISP_REG_CONFIG_DSIO_SEL_IN;
> +		value = DSI3_SEL_IN_RDMA1;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI0) {
> +		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> +		value = DPI0_SEL_IN_RDMA2;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DPI1) {
> +		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
> +		value = DPI1_SEL_IN_RDMA2;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI0) {
> +		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> +		value = DSI0_SEL_IN_RDMA2;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI1) {
> +		*addr = DISP_REG_CONFIG_DSIO_SEL_IN;
> +		value = DSI1_SEL_IN_RDMA2;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI2) {
> +		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> +		value = DSI2_SEL_IN_RDMA2;
> +	} else if (cur == DDP_COMPONENT_RDMA2 && next == DDP_COMPONENT_DSI3) {
> +		*addr = DISP_REG_CONFIG_DSIE_SEL_IN;
> +		value = DSI3_SEL_IN_RDMA2;
> +	} else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
> +		*addr = DISP_REG_CONFIG_DISP_COLOR1_SEL_IN;
> +		value = COLOR1_SEL_IN_OVL1;
> +	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0) {
> +		*addr = DISP_REG_CONFIG_DSI_SEL;
> +		value = DSI_SEL_IN_BLS;
> +	} else {
> +		value = 0;
> +	}
> +
> +	return value;
> +}
> +
> +static void mtk_mmsys_ddp_sout_sel(void __iomem *config_regs,
> +				   enum mtk_ddp_comp_id cur,
> +				   enum mtk_ddp_comp_id next)
> +{
> +	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0) {
> +		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
> +			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> +	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DPI0) {
> +		writel_relaxed(BLS_TO_DPI_RDMA1_TO_DSI,
> +			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> +		writel_relaxed(DSI_SEL_IN_RDMA,
> +			       config_regs + DISP_REG_CONFIG_DSI_SEL);
> +		writel_relaxed(DPI_SEL_IN_BLS,
> +			       config_regs + DISP_REG_CONFIG_DPI_SEL);
> +	}
> +}
> +
> +void mtk_mmsys_ddp_connect(struct device *dev,
> +			   enum mtk_ddp_comp_id cur,
> +			   enum mtk_ddp_comp_id next)
> +{
> +	void __iomem *config_regs = dev_get_drvdata(dev);
> +	unsigned int addr, value, reg;
> +
> +	value = mtk_mmsys_ddp_mout_en(cur, next, &addr);
> +	if (value) {
> +		reg = readl_relaxed(config_regs + addr) | value;
> +		writel_relaxed(reg, config_regs + addr);
> +	}
> +
> +	mtk_mmsys_ddp_sout_sel(config_regs, cur, next);
> +
> +	value = mtk_mmsys_ddp_sel_in(cur, next, &addr);
> +	if (value) {
> +		reg = readl_relaxed(config_regs + addr) | value;
> +		writel_relaxed(reg, config_regs + addr);
> +	}
> +}
> +
> +void mtk_mmsys_ddp_disconnect(struct device *dev,
> +			      enum mtk_ddp_comp_id cur,
> +			      enum mtk_ddp_comp_id next)
> +{
> +	void __iomem *config_regs = dev_get_drvdata(dev);
> +	unsigned int addr, value, reg;
> +
> +	value = mtk_mmsys_ddp_mout_en(cur, next, &addr);
> +	if (value) {
> +		reg = readl_relaxed(config_regs + addr) & ~value;
> +		writel_relaxed(reg, config_regs + addr);
> +	}
> +
> +	value = mtk_mmsys_ddp_sel_in(cur, next, &addr);
> +	if (value) {
> +		reg = readl_relaxed(config_regs + addr) & ~value;
> +		writel_relaxed(reg, config_regs + addr);
> +	}
> +}
> +
>  static int mtk_mmsys_probe(struct platform_device *pdev)
>  {
>  	struct device_node *node = pdev->dev.of_node;
>  	const struct mtk_mmsys_driver_data *data;
>  	struct clk_onecell_data *clk_data;
> +	struct device *dev = &pdev->dev;
> +	void __iomem *config_regs;
> +	struct resource *mem;
>  	int ret;
>  
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	config_regs = devm_ioremap_resource(dev, mem);
> +	if (IS_ERR(config_regs)) {
> +		ret = PTR_ERR(config_regs);
> +		dev_err(dev, "Failed to ioremap mmsys-config resource: %d\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, config_regs);
> +
>  	clk_data = mtk_alloc_clk_data(CLK_MM_NR_CLK);
>  	if (!clk_data)
>  		return -ENOMEM;
> diff --git a/include/linux/soc/mediatek/mtk-mmsys.h b/include/linux/soc/mediatek/mtk-mmsys.h
> new file mode 100644
> index 000000000000..7bab5d9a3d31
> --- /dev/null
> +++ b/include/linux/soc/mediatek/mtk-mmsys.h
> @@ -0,0 +1,20 @@
> +/* 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;
> +struct device;
> +
> +void mtk_mmsys_ddp_connect(struct device *dev,
> +			   enum mtk_ddp_comp_id cur,
> +			   enum mtk_ddp_comp_id next);
> +
> +void mtk_mmsys_ddp_disconnect(struct device *dev,
> +			      enum mtk_ddp_comp_id cur,
> +			      enum mtk_ddp_comp_id next);
> +
> +#endif /* __MTK_MMSYS_H */

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