ARM: rmobile: Reset ethernet PHY

Toggle the PHY reset GPIO to bring the ethernet PHY out of reset properly.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
---
NOTE: This should be moved to the SH ethernet driver, but it's quite
      late in the cycle, so this is something to be done in 2018.05.

board/renesas/porter/porter.c

@@ -65,11 +65,19 @@ int board_early_init_f(void)
 	return 0;
 }
 
+#define ETHERNET_PHY_RESET	176	/* GPIO 5 22 */
+
 int board_init(void)
 {
 	/* adress of boot parameters */
 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
 
+	/* Force ethernet PHY out of reset */
+	gpio_request(ETHERNET_PHY_RESET, "phy_reset");
+	gpio_direction_output(ETHERNET_PHY_RESET, 0);
+	mdelay(10);
+	gpio_direction_output(ETHERNET_PHY_RESET, 1);
+
 	return 0;
 }