disp: msm: dp: compile MST feature based on display config

Add a compile time flag for the MST feature that will allow
selectively enabling the feature.

Change-Id: I8bf288277c7af00c3cf254a8c757151559e0a010
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>

msm/dp/dp_mst_drm.h

@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _DP_MST_DRM_H_
+#define _DP_MST_DRM_H_
+
+#include <linux/types.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+
+#include "dp_display.h"
+
+#ifdef CONFIG_DRM_MSM_DP_MST
+
+/**
+ * dp_mst_drm_bridge_init - initialize mst bridge
+ * @display: Pointer to private display structure
+ * @encoder: Pointer to encoder for mst bridge mapping
+ */
+int dp_mst_drm_bridge_init(void *display,
+	struct drm_encoder *encoder);
+
+/**
+ * dp_mst_drm_bridge_deinit - de-initialize mst bridges
+ * @display: Pointer to private display structure
+ */
+void dp_mst_drm_bridge_deinit(void *display);
+
+/**
+ * dp_mst_init - initialize mst objects for the given display
+ * @display: Pointer to private display structure
+ */
+int dp_mst_init(struct dp_display *dp_display);
+
+/**
+ * dp_mst_deinit - de-initialize mst objects for the given display
+ * @display: Pointer to private display structure
+ */
+void dp_mst_deinit(struct dp_display *dp_display);
+#else
+
+static inline int dp_mst_drm_bridge_init(void *display,
+	struct drm_encoder *encoder)
+{
+	return 0;
+}
+
+static inline void dp_mst_drm_bridge_deinit(void *display)
+{
+}
+
+static inline int dp_mst_init(struct dp_display *dp_display)
+{
+	return 0;
+}
+
+static inline int dp_mst_deinit(struct dp_display *dp_display)
+{
+	return 0;
+}
+#endif
+
+#endif /* _DP_MST_DRM_H_ */