stm32mp: fix compilation issue with DEBUG_UART

Fix the compilation issue when CONFIG_DEBUG_UART is activated

 drivers/serial/serial_stm32.o: in function `debug_uart_init':
 drivers/serial/serial_stm32.c:291: undefined reference to \
    `board_debug_uart_init'

The board_debug_uart_init is needed for SPL boot, called in
cpu.c::mach_cpu_init(); it is defined in board/st/stm32mp1/spl.c.

But with the removal #ifdefs patch, the function debug_uart_init() is
always compiled even if not present in the final U-Boot image.

This patch adds a file to provided this function when DEBUG_UART and SPL
are activated.

Fixes: c8b2eef52b6c ("stm32mp15: tidy up #ifdefs in cpu.c")
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

6 files changed, 34 insertions, 54 deletions

diff --git a/arch/arm/mach-stm32mp/Kconfig.15x b/arch/arm/mach-stm32mp/Kconfig.15x
index d516270292..5bd9b53a5d 100644
--- a/arch/arm/mach-stm32mp/Kconfig.15x
+++ b/arch/arm/mach-stm32mp/Kconfig.15x
@@ -117,7 +117,7 @@ endif
 if DEBUG_UART
 
 config DEBUG_UART_BOARD_INIT
-	default y
+	default y if SPL
 
 # debug on UART4 by default
 config DEBUG_UART_BASE
diff --git a/board/engicam/stm32mp1/Makefile b/board/engicam/stm32mp1/Makefile
index 65560df290..155d33f9ee 100644
--- a/board/engicam/stm32mp1/Makefile
+++ b/board/engicam/stm32mp1/Makefile
@@ -8,3 +8,5 @@ obj-y += spl.o
 else
 obj-y += stm32mp1.o
 endif
+
+obj-$(CONFIG_DEBUG_UART_BOARD_INIT) += ../../st/stm32mp1/debug_uart.o
diff --git a/board/engicam/stm32mp1/spl.c b/board/engicam/stm32mp1/spl.c
index 3aa738b3fa..2b7779cc01 100644
--- a/board/engicam/stm32mp1/spl.c
+++ b/board/engicam/stm32mp1/spl.c
@@ -6,7 +6,6 @@
  */
 
 #include <common.h>
-#include <asm/io.h>
 
 /* board early initialisation in board_f: need to use global variable */
 static u32 opp_voltage_mv __section(".data");
@@ -22,27 +21,3 @@ int board_early_init_f(void)
 	return 0;
 }
 
-#ifdef CONFIG_DEBUG_UART_BOARD_INIT
-void board_debug_uart_init(void)
-{
-#if (CONFIG_DEBUG_UART_BASE == STM32_UART4_BASE)
-
-#define RCC_MP_APB1ENSETR (STM32_RCC_BASE + 0x0A00)
-#define RCC_MP_AHB4ENSETR (STM32_RCC_BASE + 0x0A28)
-
-	/* UART4 clock enable */
-	setbits_le32(RCC_MP_APB1ENSETR, BIT(16));
-
-#define GPIOG_BASE 0x50008000
-	/* GPIOG clock enable */
-	writel(BIT(6), RCC_MP_AHB4ENSETR);
-	/* GPIO configuration for ST boards: Uart4 TX = G11 */
-	writel(0xffbfffff, GPIOG_BASE + 0x00);
-	writel(0x00006000, GPIOG_BASE + 0x24);
-#else
-
-#error("CONFIG_DEBUG_UART_BASE: not supported value")
-
-#endif
-}
-#endif
diff --git a/board/st/stm32mp1/Makefile b/board/st/stm32mp1/Makefile
index 65560df290..f2d720b67b 100644
--- a/board/st/stm32mp1/Makefile
+++ b/board/st/stm32mp1/Makefile
@@ -8,3 +8,5 @@ obj-y += spl.o
 else
 obj-y += stm32mp1.o
 endif
+
+obj-$(CONFIG_DEBUG_UART_BOARD_INIT) += debug_uart.o
diff --git a/board/st/stm32mp1/debug_uart.c b/board/st/stm32mp1/debug_uart.c
new file mode 100644
index 0000000000..24e3f9f220
--- /dev/null
+++ b/board/st/stm32mp1/debug_uart.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause
+/*
+ * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
+ */
+
+#include <config.h>
+#include <debug_uart.h>
+#include <asm/io.h>
+#include <asm/arch/stm32.h>
+#include <linux/bitops.h>
+
+#define RCC_MP_APB1ENSETR (STM32_RCC_BASE + 0x0A00)
+#define RCC_MP_AHB4ENSETR (STM32_RCC_BASE + 0x0A28)
+
+#define GPIOG_BASE 0x50008000
+
+void board_debug_uart_init(void)
+{
+	if (CONFIG_DEBUG_UART_BASE == STM32_UART4_BASE) {
+		/* UART4 clock enable */
+		setbits_le32(RCC_MP_APB1ENSETR, BIT(16));
+
+		/* GPIOG clock enable */
+		writel(BIT(6), RCC_MP_AHB4ENSETR);
+		/* GPIO configuration for ST boards: Uart4 TX = G11 */
+		writel(0xffbfffff, GPIOG_BASE + 0x00);
+		writel(0x00006000, GPIOG_BASE + 0x24);
+	}
+}
diff --git a/board/st/stm32mp1/spl.c b/board/st/stm32mp1/spl.c
index 8e4549a1b3..747ec7e445 100644
--- a/board/st/stm32mp1/spl.c
+++ b/board/st/stm32mp1/spl.c
@@ -5,11 +5,7 @@
 
 #include <config.h>
 #include <common.h>
-#include <init.h>
-#include <asm/io.h>
 #include <asm/arch/sys_proto.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
 #include "../common/stpmic1.h"
 
 /* board early initialisation in board_f: need to use global variable */
@@ -29,27 +25,3 @@ int board_early_init_f(void)
 	return 0;
 }
 
-#ifdef CONFIG_DEBUG_UART_BOARD_INIT
-void board_debug_uart_init(void)
-{
-#if (CONFIG_DEBUG_UART_BASE == STM32_UART4_BASE)
-
-#define RCC_MP_APB1ENSETR (STM32_RCC_BASE + 0x0A00)
-#define RCC_MP_AHB4ENSETR (STM32_RCC_BASE + 0x0A28)
-
-	/* UART4 clock enable */
-	setbits_le32(RCC_MP_APB1ENSETR, BIT(16));
-
-#define GPIOG_BASE 0x50008000
-	/* GPIOG clock enable */
-	writel(BIT(6), RCC_MP_AHB4ENSETR);
-	/* GPIO configuration for ST boards: Uart4 TX = G11 */
-	writel(0xffbfffff, GPIOG_BASE + 0x00);
-	writel(0x00006000, GPIOG_BASE + 0x24);
-#else
-
-#error("CONFIG_DEBUG_UART_BASE: not supported value")
-
-#endif
-}
-#endif