drm/bridge/synopsys: Add MIPI DSI host controller bridge

Add a Synopsys Designware MIPI DSI host DRM bridge driver, based on the
Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.
Signed-off-by: Philippe CORNU <philippe.cornu@st.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1500277223-29553-5-git-send-email-philippe.cornu@st.com

drivers/gpu/drm/bridge/synopsys/Kconfig

@@ -22,3 +22,9 @@ config DRM_DW_HDMI_I2S_AUDIO
 	help
 	  Support the I2S Audio interface which is part of the Synopsys
 	  Designware HDMI block.
+
+config DRM_DW_MIPI_DSI
+	tristate
+	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
+	select DRM_PANEL_BRIDGE

drivers/gpu/drm/bridge/synopsys/Makefile

@@ -3,3 +3,5 @@
 obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
 obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
 obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
+
+obj-$(CONFIG_DRM_DW_MIPI_DSI) += dw-mipi-dsi.o

include/drm/bridge/dw_mipi_dsi.h

+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef __DW_MIPI_DSI__
+#define __DW_MIPI_DSI__
+
+struct dw_mipi_dsi_phy_ops {
+	int (*init)(void *priv_data);
+	int (*get_lane_mbps)(void *priv_data, struct drm_display_mode *mode,
+			     unsigned long mode_flags, u32 lanes, u32 format,
+			     unsigned int *lane_mbps);
+};
+
+struct dw_mipi_dsi_plat_data {
+	void __iomem *base;
+	unsigned int max_data_lanes;
+
+	enum drm_mode_status (*mode_valid)(void *priv_data,
+					   const struct drm_display_mode *mode);
+
+	const struct dw_mipi_dsi_phy_ops *phy_ops;
+
+	void *priv_data;
+};
+
+int dw_mipi_dsi_probe(struct platform_device *pdev,
+		      const struct dw_mipi_dsi_plat_data *plat_data);
+void dw_mipi_dsi_remove(struct platform_device *pdev);
+int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
+		     const struct dw_mipi_dsi_plat_data *plat_data);
+void dw_mipi_dsi_unbind(struct device *dev);
+
+#endif /* __DW_MIPI_DSI__ */