arm: am335x: DXR2: Move unconditional LAN9303 reset into command

The switch HW reset results in a disconnection of the switch port daisy-
chain for a few seconds. This is not desired in the normal field use
case. So lets remove this switch reset from the normal bootup sequence
and move it into a board specific command. This way it can be executed
in the development environment when really needed.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Roger Meier <r.meier@siemens.com>
Cc: Lukas Stockmann <lukas.stockmann@siemens.com>
Cc: Tom Rini <trini@ti.com>

board/siemens/dxr2/board.c

@@ -232,13 +232,6 @@ int board_eth_init(bd_t *bis)
 
 	factoryset_setenv();
 
-	/* Reset SMSC LAN9303 switch for default configuration */
-	gpio_request(GPIO_LAN9303_NRST, "nRST");
-	gpio_direction_output(GPIO_LAN9303_NRST, 0);
-	/* assert active low reset for 200us */
-	udelay(200);
-	gpio_set_value(GPIO_LAN9303_NRST, 1);
-
 	/* Set rgmii mode and enable rmii clock to be sourced from chip */
 	writel((RMII_MODE_ENABLE | RMII_CHIPCKL_ENABLE), &cdev->miisel);
 
@@ -249,6 +242,25 @@ int board_eth_init(bd_t *bis)
 		n += rv;
 	return n;
 }
+
+static int do_switch_reset(cmd_tbl_t *cmdtp, int flag, int argc,
+			   char *const argv[])
+{
+	/* Reset SMSC LAN9303 switch for default configuration */
+	gpio_request(GPIO_LAN9303_NRST, "nRST");
+	gpio_direction_output(GPIO_LAN9303_NRST, 0);
+	/* assert active low reset for 200us */
+	udelay(200);
+	gpio_set_value(GPIO_LAN9303_NRST, 1);
+
+	return 0;
+};
+
+U_BOOT_CMD(
+	switch_rst, CONFIG_SYS_MAXARGS, 1,	do_switch_reset,
+	"Reset LAN9303 switch via its reset pin",
+	""
+);
 #endif /* #if defined(CONFIG_DRIVER_TI_CPSW) */
 #endif /* #if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) */