Most panels are very simple - they just have a power supply and a backlight. Add a driver which supports this and implements the enable_backlight() method.
Signed-off-by: Simon Glass sjg@chromium.org ---
drivers/video/Makefile | 2 +- drivers/video/simple_panel.c | 99 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 100 insertions(+), 1 deletion(-) create mode 100644 drivers/video/simple_panel.c
diff --git a/drivers/video/Makefile b/drivers/video/Makefile index d29280c..6658e96 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -8,7 +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) += panel-uclass.o simple_panel.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/simple_panel.c b/drivers/video/simple_panel.c new file mode 100644 index 0000000..b161517 --- /dev/null +++ b/drivers/video/simple_panel.c @@ -0,0 +1,99 @@ +/* + * Copyright (c) 2016 Google, Inc + * Written by Simon Glass sjg@chromium.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <backlight.h> +#include <dm.h> +#include <panel.h> +#include <asm/gpio.h> +#include <power/regulator.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct simple_panel_priv { + struct udevice *reg; + struct udevice *backlight; + struct gpio_desc enable; +}; + +static int simple_panel_enable_backlight(struct udevice *dev) +{ + struct simple_panel_priv *priv = dev_get_priv(dev); + int ret; + + dm_gpio_set_value(&priv->enable, 1); + ret = backlight_enable(priv->backlight); + if (ret) + return ret; + + return 0; +} + +static int simple_panel_ofdata_to_platdata(struct udevice *dev) +{ + struct simple_panel_priv *priv = dev_get_priv(dev); + int ret; + + ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev, + "power-supply", &priv->reg); + if (ret) { + debug("%s: Warning: cnnot get power supply: ret=%d\n", + __func__, ret); + if (ret != -ENOENT) + return ret; + } + ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev, + "backlight", &priv->backlight); + if (ret) { + debug("%s: Cannot get backlight: ret=%d\n", __func__, ret); + return ret; + } + ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable, + GPIOD_IS_OUT); + if (ret) { + debug("%s: Warning: cannot get enable GPIO: ret=%d\n", + __func__, ret); + if (ret != -ENOENT) + return ret; + } + + return 0; +} + +static int simple_panel_probe(struct udevice *dev) +{ + struct simple_panel_priv *priv = dev_get_priv(dev); + int ret; + + if (priv->reg) { + debug("%s: Enable regulator '%s'\n", __func__, priv->reg->name); + ret = regulator_set_enable(priv->reg, true); + if (ret) + return ret; + } + + return 0; +} + +static const struct panel_ops simple_panel_ops = { + .enable_backlight = simple_panel_enable_backlight, +}; + +static const struct udevice_id simple_panel_ids[] = { + { .compatible = "simple-panel" }, + { } +}; + +U_BOOT_DRIVER(simple_panel) = { + .name = "simple_panel", + .id = UCLASS_PANEL, + .of_match = simple_panel_ids, + .ops = &simple_panel_ops, + .ofdata_to_platdata = simple_panel_ofdata_to_platdata, + .probe = simple_panel_probe, + .priv_auto_alloc_size = sizeof(struct simple_panel_priv), +};