Merge tag 'fbdev-v4.19' of https://github.com/bzolnier/linux

 - interrupts : framebuffer controller interrupt.

 - clocks: phandle to input clocks

Optional properties:

 - lcd-supply: A phandle to a power regulator that controls the LCD voltage.

Required nodes:

 - port: connection to the LCD panel (see video-interfaces.txt)

	 This node must have its properties bus-width and remote-endpoint set.

PXA3xx GCU Controller

---------------------

Required properties:

 - compatible : "marvell,pxa300-gcu"

 - reg : should contain the register range (address and length).

 - interrupts : Controller interrupt.

 - clocks: phandle to the PXA specific input clock.

Example for PXA300:

	display-controller@54000000 {

		compatible = "marvell,pxa300-gcu";

		reg = <0x54000000 0x1000>;

		interrupts = <39>;

		clocks = <&clks CLK_PXA300_GCU>;

	};

A. Configuration

	The framebuffer console can be enabled by using your favorite kernel

configuration tool.  It is under Device Drivers->Graphics Support->Support for

framebuffer devices->Framebuffer Console Support. Select 'y' to compile

support statically, or 'm' for module support.  The module will be fbcon.

configuration tool.  It is under Device Drivers->Graphics Support->Frame

buffer Devices->Console display driver support->Framebuffer Console Support.

Select 'y' to compile support statically or 'm' for module support.  The

module will be fbcon.

	In order for fbcon to activate, at least one framebuffer driver is

required, so choose from any of the numerous drivers available. For x86

more speed and features, such as the ability to change the video mode

dynamically.

	To display the penguin logo, choose any logo available in Logo

Configuration->Boot up logo.

	To display the penguin logo, choose any logo available in Graphics

support->Bootup logo.

	Also, you will need to select at least one compiled-in fonts, but if

	Also, you will need to select at least one compiled-in font, but if

you don't do anything, the kernel configuration tool will select one for you,

usually an 8x16 font.

	The angle can be changed anytime afterwards by 'echoing' the same

	numbers to any one of the 2 attributes found in

	 /sys/class/graphics/fbcon

	/sys/class/graphics/fbcon:

		rotate     - rotate the display of the active console

		rotate_all - rotate the display of all consoles

	Console rotation will only become available if Console Rotation

	Support is compiled in your kernel.

	Console rotation will only become available if Framebuffer Console

	Rotation support is compiled in your kernel.

	NOTE: This is purely console rotation.  Any other applications that

	use the framebuffer will remain at their 'normal' orientation.

C. Attaching, Detaching and Unloading

Before going on how to attach, detach and unload the framebuffer console, an

Before going on to how to attach, detach and unload the framebuffer console, an

illustration of the dependencies may help.

The console layer, as with most subsystems, needs a driver that interfaces with

console ---> fbcon ---> fbdev drivers ---> hardware

The fbdev drivers cannot be unloaded if it's bound to fbcon, and fbcon cannot

The fbdev drivers cannot be unloaded if bound to fbcon, and fbcon cannot

be unloaded if it's bound to the console layer.

So to unload the fbdev drivers, one must first unbind fbcon from the console,

       echo 0 > /sys/class/vtconsole/vtcon1/bind

6. That's it, you're back to VGA mode. And if you compiled fbcon as a module,

   you can unload it by 'rmmod fbcon'

   you can unload it by 'rmmod fbcon'.

7. To reattach fbcon:

========

Here are 2 sample bash scripts that you can use to bind or unbind the

framebuffer console driver if you are in an X86 box:

framebuffer console driver if you are on an X86 box:

---------------------------------------------------------------------------

#!/bin/bash

#include <linux/efi-bgrt.h>

struct acpi_table_bgrt bgrt_tab;

size_t __initdata bgrt_image_size;

size_t bgrt_image_size;

struct bmp_header {

	u16 id;

config FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER

	bool "Framebuffer Console Deferred Takeover"

	depends on FRAMEBUFFER_CONSOLE=y && DUMMY_CONSOLE=y

	depends on FB=y && FRAMEBUFFER_CONSOLE && DUMMY_CONSOLE

	help

	  If enabled this defers the framebuffer console taking over the

	  console from the dummy console until the first text is displayed on