upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/drivers/video/panel-uclass.c

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/*
* 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",
};