Use board_debug_uart_init() for UART iomux init instead of
do it in board_init_f, and move the function to soc file so
that we can find all the soc/board setting in soc file and
use a common board file.

Signed-off-by: Kever Yang <kever.y...@rock-chips.com>
---

 arch/arm/mach-rockchip/rk3188-board-spl.c | 12 +---------
 arch/arm/mach-rockchip/rk3188/Makefile    |  1 +
 arch/arm/mach-rockchip/rk3188/rk3188.c    | 37 +++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 11 deletions(-)
 create mode 100644 arch/arm/mach-rockchip/rk3188/rk3188.c

diff --git a/arch/arm/mach-rockchip/rk3188-board-spl.c 
b/arch/arm/mach-rockchip/rk3188-board-spl.c
index 3ccc4f1..56ff77b 100644
--- a/arch/arm/mach-rockchip/rk3188-board-spl.c
+++ b/arch/arm/mach-rockchip/rk3188-board-spl.c
@@ -99,17 +99,7 @@ void board_init_f(ulong dummy)
        int ret;
 
        /* Example code showing how to enable the debug UART on RK3188 */
-#ifdef EARLY_UART
-#include <asm/arch/grf_rk3188.h>
-       /* Enable early UART on the RK3188 */
-#define GRF_BASE       0x20008000
-       struct rk3188_grf * const grf = (void *)GRF_BASE;
-
-       rk_clrsetreg(&grf->gpio1b_iomux,
-                    GPIO1B1_MASK << GPIO1B1_SHIFT |
-                    GPIO1B0_MASK << GPIO1B0_SHIFT,
-                    GPIO1B1_UART2_SOUT << GPIO1B1_SHIFT |
-                    GPIO1B0_UART2_SIN << GPIO1B0_SHIFT);
+#ifdef CONFIG_DEBUG_UART
        /*
         * Debug UART can be used from here if required:
         *
diff --git a/arch/arm/mach-rockchip/rk3188/Makefile 
b/arch/arm/mach-rockchip/rk3188/Makefile
index 7fa0104..7dc123a 100644
--- a/arch/arm/mach-rockchip/rk3188/Makefile
+++ b/arch/arm/mach-rockchip/rk3188/Makefile
@@ -6,5 +6,6 @@
 
 ifndef CONFIG_TPL_BUILD
 obj-y += clk_rk3188.o
+obj-y += rk3188.o
 obj-y += syscon_rk3188.o
 endif
diff --git a/arch/arm/mach-rockchip/rk3188/rk3188.c 
b/arch/arm/mach-rockchip/rk3188/rk3188.c
new file mode 100644
index 0000000..f2adcc9
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3188/rk3188.c
@@ -0,0 +1,37 @@
+/*
+ * (C) Copyright 2018 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/grf_rk3188.h>
+#include <asm/arch/hardware.h>
+
+#ifdef CONFIG_DEBUG_UART_BOARD_INIT
+void board_debug_uart_init(void)
+{
+       /* Enable early UART on the RK3188 */
+#define GRF_BASE       0x20008000
+       struct rk3188_grf * const grf = (void *)GRF_BASE;
+       enum {
+               GPIO1B1_SHIFT           = 2,
+               GPIO1B1_MASK            = 3,
+               GPIO1B1_GPIO            = 0,
+               GPIO1B1_UART2_SOUT,
+               GPIO1B1_JTAG_TDO,
+
+               GPIO1B0_SHIFT           = 0,
+               GPIO1B0_MASK            = 3,
+               GPIO1B0_GPIO            = 0,
+               GPIO1B0_UART2_SIN,
+               GPIO1B0_JTAG_TDI,
+       };
+
+       rk_clrsetreg(&grf->gpio1b_iomux,
+                    GPIO1B1_MASK << GPIO1B1_SHIFT |
+                    GPIO1B0_MASK << GPIO1B0_SHIFT,
+                    GPIO1B1_UART2_SOUT << GPIO1B1_SHIFT |
+                    GPIO1B0_UART2_SIN << GPIO1B0_SHIFT);
+}
+#endif
-- 
1.9.1

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