To prepare support for newer chips that need to share their address
range with a dedicated ddc driver, use a regmap.

Signed-off-by: Guillaume Ranquet <redacted>
---
  drivers/gpu/drm/mediatek/mtk_hdmi.c | 43 +++++++++++--------------------------
  1 file changed, 13 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 4c80b6896dc3..9b02b30a193a 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c

@@ -171,7 +171,7 @@ struct mtk_hdmi {
  	u32 ibias_up;
  	struct regmap *sys_regmap;
  	unsigned int sys_offset;
-	void __iomem *regs;
+	struct regmap *regs;
  	enum hdmi_colorspace csp;
  	struct hdmi_audio_param aud_param;
  	bool audio_enable;

@@ -187,44 +187,29 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
  	return container_of(b, struct mtk_hdmi, bridge);
  }
  
-static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
+static int mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset, u32 *val)
  {
-	return readl(hdmi->regs + offset);
+	return regmap_read(hdmi->regs, offset, val);
  }
  
  static void mtk_hdmi_write(struct mtk_hdmi *hdmi, u32 offset, u32 val)
  {
-	writel(val, hdmi->regs + offset);
+	regmap_write(hdmi->regs, offset, val);
  }
  
  static void mtk_hdmi_clear_bits(struct mtk_hdmi *hdmi, u32 offset, u32 bits)