From 085782144a0dbf323999e7e25825bdf089639be4 Mon Sep 17 00:00:00 2001
From: Greg Ungerer <gerg@kernel.org>
Date: Mon, 9 Dec 2024 22:23:32 +1000
Subject: [PATCH] m68k: example board defined UART table

Example changes that allow a specific ColdFire board to define only the
UART devices that it has available and not necessarily all the SoC
actually has.

Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
---
 arch/m68k/Kconfig.machine           | 10 ++++++++++
 arch/m68k/coldfire/Makefile         |  1 +
 arch/m68k/coldfire/device.c         |  8 ++++++++
 arch/m68k/coldfire/jm_54418_board.c | 21 +++++++++++++++++++++
 4 files changed, 40 insertions(+)
 create mode 100644 arch/m68k/coldfire/jm_54418_board.c

diff --git a/arch/m68k/Kconfig.machine b/arch/m68k/Kconfig.machine
index de39f23b180e..536b511f6c31 100644
--- a/arch/m68k/Kconfig.machine
+++ b/arch/m68k/Kconfig.machine
@@ -322,6 +322,16 @@ config MOD5272
 	help
 	  Support for the Netburner MOD-5272 board.
 
+config BOARD_HAS_DEFINED_UARTS
+	bool
+
+config JM_54418_BOARD
+	bool "JM's 54418 based board"
+	depends on M5441x
+	select BOARD_HAS_DEFINED_UARTS
+	help
+	  Support for JM's 54418 based ColdFire platform.
+
 if !MMU || COLDFIRE
 
 comment "Machine Options"
diff --git a/arch/m68k/coldfire/Makefile b/arch/m68k/coldfire/Makefile
index c56bc0dc7f2e..06b9a75a596d 100644
--- a/arch/m68k/coldfire/Makefile
+++ b/arch/m68k/coldfire/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_FIREBEE)	+= firebee.o
 obj-$(CONFIG_MCF8390)	+= mcf8390.o
 obj-$(CONFIG_AMCORE)	+= amcore.o
 obj-$(CONFIG_STMARK2)	+= stmark2.o
+obj-$(CONFIG_JM_54418_BOARD) += jm_54418_board.o
 
 obj-$(CONFIG_PCI)	+= pci.o
 
diff --git a/arch/m68k/coldfire/device.c b/arch/m68k/coldfire/device.c
index b6958ec2a220..f8be795fa9ec 100644
--- a/arch/m68k/coldfire/device.c
+++ b/arch/m68k/coldfire/device.c
@@ -26,7 +26,14 @@
 
 /*
  *	All current ColdFire parts contain from 2, 3, 4 or 10 UARTS.
+ *	This mapping will create all possible UARTs for a platform.
+ *	Some boards only want to use a more limited set of UARTS,
+ *	in that case the board should use BOARD_HAS_DEFINED_UARTS and
+ *	define their own UART platform data in board specific code.
  */
+#ifdef BOARD_HAS_DEFINED_UARTS
+extern struct mcf_platform_uart mcf_uart_platform_data[];
+#else
 static struct mcf_platform_uart mcf_uart_platform_data[] = {
 	{
 		.mapbase	= MCFUART_BASE0,
@@ -86,6 +93,7 @@ static struct mcf_platform_uart mcf_uart_platform_data[] = {
 #endif
 	{ },
 };
+#endif /* HAS_BOARD_DEFINED_UARTS */
 
 static struct platform_device mcf_uart = {
 	.name			= "mcfuart",
diff --git a/arch/m68k/coldfire/jm_54418_board.c b/arch/m68k/coldfire/jm_54418_board.c
new file mode 100644
index 000000000000..6a9d03c03f76
--- /dev/null
+++ b/arch/m68k/coldfire/jm_54418_board.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfuart.h>
+
+static struct mcf_platform_uart mcf_uart_platform_data[] = {
+	{
+		.mapbase	= MCFUART_BASE2,
+		.irq		= MCF_IRQ_UART2,
+	},
+	{
+		.mapbase	= MCFUART_BASE6,
+		.irq		= MCF_IRQ_UART6,
+	},
+	{ },
+};
+
-- 
2.25.1