dm: Add a dsi host uclass

Display Serial Interface (DSI) host can usefully be modelled
as their own uclass.
DSI defines a serial bus and a communication protocol
between the host and the device (panel, bridge).

Signed-off-by: Yannick Fertré <yannick.fertre@st.com>

2 files changed, 74 insertions, 0 deletions

diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index f431f3bf29..f7f323752c 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -40,6 +40,7 @@ enum uclass_id {
 	UCLASS_CPU,		/* CPU, typically part of an SoC */
 	UCLASS_CROS_EC,		/* Chrome OS EC */
 	UCLASS_DISPLAY,		/* Display (e.g. DisplayPort, HDMI) */
+	UCLASS_DSI_HOST,	/* Display Serial Interface host */
 	UCLASS_DMA,		/* Direct Memory Access */
 	UCLASS_EFI,		/* EFI managed devices */
 	UCLASS_ETH,		/* Ethernet device */
diff --git a/include/dsi_host.h b/include/dsi_host.h
new file mode 100644
index 0000000000..9dfc7b3687
--- /dev/null
+++ b/include/dsi_host.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2019 STMicroelectronics - All Rights Reserved
+ * Author(s): Yannick Fertre <yannick.fertre@st.com> for STMicroelectronics.
+ *
+ */
+
+#ifndef _DSI_HOST_H
+#define _DSI_HOST_H
+
+#include <mipi_dsi.h>
+
+struct dsi_host_ops {
+	/**
+	 * init() - initialized the dsi_host
+	 *
+	 * @dev: dsi host device
+	 * @device: DSI peripheral device
+	 * @timing: Display timings
+	 * @max_data_lanes: maximum number of data lines
+	 * @phy_ops: set of function pointers for performing physical operations
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*init)(struct udevice *dev,
+		    struct mipi_dsi_device *device,
+		    struct display_timing *timings,
+		    unsigned int max_data_lanes,
+		    const struct mipi_dsi_phy_ops *phy_ops);
+
+	/**
+	 * enable() - Enable the dsi_host
+	 *
+	 * @dev: dsi host device
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*enable)(struct udevice *dev);
+
+	/**
+	 * disable() - Disable the dsi_host
+	 *
+	 * @dev: dsi host device
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*disable)(struct udevice *dev);
+};
+
+#define dsi_host_get_ops(dev)	((struct dsi_host_ops *)(dev)->driver->ops)
+
+/**
+ * dsi_host_init
+ *
+ * @dev: dsi host device
+ * @device: DSI peripheral device
+ * @timing: Display timings
+ * @max_data_lanes: maximum number of data lines
+ * @phy_ops: set of function pointers for performing physical operations
+ * @return 0 if OK, -ve on error
+ */
+int dsi_host_init(struct udevice *dev,
+		  struct mipi_dsi_device *device,
+		  struct display_timing *timings,
+		  unsigned int max_data_lanes,
+		  const struct mipi_dsi_phy_ops *phy_ops);
+
+/**
+ * dsi_host_enable
+ *
+ * @dev:	dsi host device
+ * @return 0 if OK, -ve on error
+ */
+int dsi_host_enable(struct udevice *dev);
+
+#endif