From 77594d7fbf01f2b2c968271951d41edb515428f4 Mon Sep 17 00:00:00 2001
From: Patrice Chotard <patrice.chotard@st.com>
Date: Fri, 22 Feb 2019 15:04:44 +0100
Subject: [PATCH] board: stm32f746-disco: Get MII/RMII phy_mode from DT

This is needed to make ethernet work on stm32f746-eval which
uses MII mode.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
---
 board/st/stm32f746-disco/stm32f746-disco.c | 23 ++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/board/st/stm32f746-disco/stm32f746-disco.c b/board/st/stm32f746-disco/stm32f746-disco.c
index 7c9b1ad82a..e89ed2153b 100644
--- a/board/st/stm32f746-disco/stm32f746-disco.c
+++ b/board/st/stm32f746-disco/stm32f746-disco.c
@@ -7,6 +7,8 @@
 #include <common.h>
 #include <dm.h>
 #include <lcd.h>
+#include <miiphy.h>
+#include <phy_interface.h>
 #include <ram.h>
 #include <spl.h>
 #include <splash.h>
@@ -123,8 +125,25 @@ int board_init(void)
 	gd->bd->bi_boot_params = gd->bd->bi_dram[0].start + 0x100;
 
 #ifdef CONFIG_ETH_DESIGNWARE
-	/* Set >RMII mode */
-	STM32_SYSCFG->pmc |= SYSCFG_PMC_MII_RMII_SEL;
+	const char *phy_mode;
+	int node;
+
+	node = fdt_node_offset_by_compatible(gd->fdt_blob, 0, "st,stm32-dwmac");
+	if (node < 0)
+		return -1;
+
+	phy_mode = fdt_getprop(gd->fdt_blob, node, "phy-mode", NULL);
+
+	switch (phy_get_interface_by_name(phy_mode)) {
+	case PHY_INTERFACE_MODE_RMII:
+		STM32_SYSCFG->pmc |= SYSCFG_PMC_MII_RMII_SEL;
+		break;
+	case PHY_INTERFACE_MODE_MII:
+		STM32_SYSCFG->pmc &= ~SYSCFG_PMC_MII_RMII_SEL;
+		break;
+	default:
+		printf("PHY interface %s not supported !\n", phy_mode);
+	}
 #endif
 
 #if defined(CONFIG_CMD_BMP)
-- 
2.30.2