cmd: remove unused display command

Compiling the display command leads to an error

    undefined reference to `display_set'

No implementation of display_set() exists in U-Boot.

Eliminate the `display` command as well as the accompanying files.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

cmd/Kconfig

@@ -1425,14 +1425,6 @@ config CMD_CLS
 	  Enable the 'cls' command which clears the screen contents
 	  on video frame buffer.
 
-config CMD_DISPLAY
-	bool "Enable the 'display' command, for character displays"
-	help
-	  (this needs porting to driver model)
-	  This enables the 'display' command which allows a string to be
-	  displayed on a simple board-specific display. Implement
-	  display_putc() to use it.
-
 config CMD_EFIDEBUG
 	bool "efidebug - display/configure UEFI environment"
 	depends on EFI_LOADER

cmd/Makefile

@@ -45,7 +45,6 @@ obj-$(CONFIG_CMD_SOUND) += sound.o
 ifdef CONFIG_POST
 obj-$(CONFIG_CMD_DIAG) += diag.o
 endif
-obj-$(CONFIG_CMD_DISPLAY) += display.o
 obj-$(CONFIG_CMD_DTIMG) += dtimg.o
 obj-$(CONFIG_CMD_ECHO) += echo.o
 obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o

cmd/display.c

@@ -1,53 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * (C) Copyright 2005
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- */
-
-#include <common.h>
-#include <command.h>
-#include <led-display.h>
-
-#undef DEBUG_DISP
-
-int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
-{
-	int i;
-
-	/* Clear display */
-	display_set(DISPLAY_CLEAR | DISPLAY_HOME);
-
-	if (argc < 2)
-		return (0);
-
-	for (i = 1; i < argc; i++) {
-		char *p = argv[i];
-
-		if (i > 1) { /* Insert a space between strings */
-			display_putc(' ');
-		}
-
-		while ((*p)) {
-#ifdef DEBUG_DISP
-			putc(*p);
-#endif
-			display_putc(*p++);
-		}
-	}
-
-#ifdef DEBUG_DISP
-	putc('\n');
-#endif
-
-	return (0);
-}
-
-/***************************************************/
-
-U_BOOT_CMD(
-	display,	CONFIG_SYS_MAXARGS,	1,	do_display,
-	"display string on dot matrix display",
-	"[<string>]\n"
-	"    - with <string> argument: display <string> on dot matrix display\n"
-	"    - without arguments: clear dot matrix display"
-);

doc/README.LED_display

@@ -1,26 +0,0 @@
-LED display internal API
-=======================================
-
-This README describes the LED display API.
-
-The API is defined by the include file include/led-display.h
-
-The first step in to define CONFIG_CMD_DISPLAY in the board config file.
-Then you need to provide the following functions to access LED display:
-
-void display_set(int cmd);
-
-This function should control the state of the LED display. Argument is
-an ORed combination of the following values:
- DISPLAY_CLEAR	-- clear the display
- DISPLAY_HOME	-- set the position to the beginning of display
-
-int display_putc(char c);
-
-This function should display it's parameter on the LED display in the
-current position. Returns the displayed character on success or -1 in
-case of failure.
-
-With this functions defined 'display' command will display it's
-arguments on the LED display (or clear the display if called without
-arguments).

include/led-display.h

@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * (C) Copyright 2005-2010
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * (C) Copyright 2010
- * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
- */
-#ifndef _led_display_h_
-#define _led_display_h_
-
-/* Display Commands */
-#define DISPLAY_CLEAR	0x1 /* Clear the display */
-#define DISPLAY_HOME	0x2 /* Set cursor at home position */
-
-void display_set(int cmd);
-int display_putc(char c);
-#endif