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 ---
Changes in v2: None
drivers/video/Makefile | 1 + drivers/video/panel-uclass.c | 25 +++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/panel.h | 31 +++++++++++++++++++++++++++++++ 4 files changed, 58 insertions(+) create mode 100644 drivers/video/panel-uclass.c create mode 100644 include/panel.h
diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 6d89532..d29280c 100644 --- 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 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 5421981..8308c23 100644 --- 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 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