dm: panel: Add a panel uclass

LCD panels can usefully be modelled as their own uclass. They can be probed
(which powers them up ready for use). If they have a backlight, this can be
enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 6d89532a3232213e4b1a3bb27d98d6e50bb576f9..d29280cee4e72a58b2f2234d3888dbf29ed68bf1 100644 (file)
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -8,6 +8,7 @@
 ifdef CONFIG_DM
 obj-$(CONFIG_DISPLAY_PORT) += dp-uclass.o
 obj-$(CONFIG_DM_VIDEO) += backlight-uclass.o
+obj-$(CONFIG_DM_VIDEO) += panel-uclass.o
 obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o console_normal.o
 obj-$(CONFIG_DM_VIDEO) += video_bmp.o
 ifdef CONFIG_DM_VIDEO

diff --git a/drivers/video/panel-uclass.c b/drivers/video/panel-uclass.c
new file mode 100644 (file)
index 0000000..3f4c41b
--- /dev/null
+++ b/drivers/video/panel-uclass.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <panel.h>
+
+int panel_enable_backlight(struct udevice *dev)
+{
+       struct panel_ops *ops = panel_get_ops(dev);
+
+       if (!ops->enable_backlight)
+               return -ENOSYS;
+
+       return ops->enable_backlight(dev);
+}
+
+UCLASS_DRIVER(panel) = {
+       .id             = UCLASS_PANEL,
+       .name           = "panel",
+};

diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 5421981eb52db50e1b58b51799a60ec23627dfaf..8308c238ca6d1c2de8d2630b6d7bfbe688c38ae6 100644 (file)
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -45,6 +45,7 @@ enum uclass_id {
        UCLASS_MMC,             /* SD / MMC card or chip */
        UCLASS_MOD_EXP,         /* RSA Mod Exp device */
        UCLASS_MTD,             /* Memory Technology Device (MTD) device */
+       UCLASS_PANEL,           /* Display panel, such as an LCD */
        UCLASS_PANEL_BACKLIGHT, /* Backlight controller for panel */
        UCLASS_PCH,             /* x86 platform controller hub */
        UCLASS_PCI,             /* PCI bus */

diff --git a/include/panel.h b/include/panel.h
new file mode 100644 (file)
index 0000000..57fccf2
--- /dev/null
+++ b/include/panel.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#ifndef _PANEL_H
+#define _PANEL_H
+
+struct panel_ops {
+       /**
+        * enable_backlight() - Enable the panel backlight
+        *
+        * @dev:        Panel device containing the backlight to enable
+        * @return 0 if OK, -ve on error
+        */
+       int (*enable_backlight)(struct udevice *dev);
+};
+
+#define panel_get_ops(dev)     ((struct panel_ops *)(dev)->driver->ops)
+
+/**
+ * panel_enable_backlight() - Enable the panel backlight
+ *
+ * @dev:       Panel device containing the backlight to enable
+ * @return 0 if OK, -ve on error
+ */
+int panel_enable_backlight(struct udevice *dev);
+
+#endif