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video: panel: Add a simple panel driver 

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>
This commit is contained in:
Simon Glass 2016-01-21 19:44:59 -07:00
parent f563dc1d19
commit cd9c2070ea
2 changed files with 100 additions and 1 deletions
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2
drivers/video/Makefile
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@ -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

99
drivers/video/simple_panel.c Normal file
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@ -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),
};