arm: mvebu: Convert board_pex_config() to CONFIG_SPL_BOARD_INIT

The only user of board_pex_config() weak function is A385 controlcenterdc
board. It looks like that code in its board_pex_config() function needs to
be executed after PCIe link is up. Therefore put this code into
spl_board_init() function which is called after a38x serdes initialization,
and therefore it is after the serdes hws_pex_config() function finishes
(which is the state before this change).

With this change completely remove board_pex_config() function as it is not
used anymore.

Signed-off-by: Pali Rohár <pali@kernel.org>

arch/arm/mach-mvebu/serdes/a38x/ctrl_pex.c

@@ -14,11 +14,6 @@
 #include "ctrl_pex.h"
 #include "sys_env_lib.h"
 
-__weak void board_pex_config(void)
-{
-	/* nothing in this weak default implementation */
-}
-
 int hws_pex_config(const struct serdes_map *serdes_map, u8 count)
 {
 	enum serdes_type serdes_type;
@@ -58,7 +53,5 @@ int hws_pex_config(const struct serdes_map *serdes_map, u8 count)
 
 	reg_write(SOC_CONTROL_REG1, tmp);
 
-	board_pex_config();
-
 	return MV_OK;
 }

arch/arm/mach-mvebu/serdes/a38x/ctrl_pex.h

@@ -23,6 +23,5 @@
 #define PCIE4_ENABLE_MASK		(0x1 << PCIE3_ENABLE_OFFS)
 
 int hws_pex_config(const struct serdes_map *serdes_map, u8 count);
-void board_pex_config(void);
 
 #endif

board/gdsys/a38x/controlcenterdc.c

@@ -94,7 +94,7 @@ int hws_board_topology_load(struct serdes_map **serdes_map_array, u8 *count)
 	return 0;
 }
 
-void board_pex_config(void)
+void spl_board_init(void)
 {
 #ifdef CONFIG_SPL_BUILD
 	uint k;

configs/controlcenterdc_defconfig

@@ -33,6 +33,7 @@ CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_BOARD_LATE_INIT=y
 CONFIG_LAST_STAGE_INIT=y
+CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_I2C=y
 CONFIG_HUSH_PARSER=y