ARM: DT: stm32f7: add ethernet pin contol node

It also removes the ethernet pin configuration done during the board
initialization.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>

arch/arm/dts/stm32f746-disco.dts

@@ -78,6 +78,7 @@
 
 &mac {
 	status = "okay";
+	pinctrl-0 = <&ethernet_mii>;
 	phy-mode = "rmii";
 	phy-handle = <&phy0>;
 

arch/arm/dts/stm32f746.dtsi

@@ -117,6 +117,20 @@
 					bias-disable;
 				};
 			};
+			ethernet_mii: mii@0 {
+				pins {
+					pinmux = <STM32F746_PG13_FUNC_ETH_MII_TXD0_ETH_RMII_TXD0>,
+						 <STM32F746_PG14_FUNC_ETH_MII_TXD1_ETH_RMII_TXD1>,
+						 <STM32F746_PG11_FUNC_ETH_MII_TX_EN_ETH_RMII_TX_EN>,
+						 <STM32F746_PA2_FUNC_ETH_MDIO>,
+						 <STM32F746_PC1_FUNC_ETH_MDC>,
+						 <STM32F746_PA1_FUNC_ETH_MII_RX_CLK_ETH_RMII_REF_CLK>,
+						 <STM32F746_PA7_FUNC_ETH_MII_RX_DV_ETH_RMII_CRS_DV>,
+						 <STM32F746_PC4_FUNC_ETH_MII_RXD0_ETH_RMII_RXD0>,
+						 <STM32F746_PC5_FUNC_ETH_MII_RXD1_ETH_RMII_RXD1>;
+					slew-rate = <2>;
+				};
+			};
 		};
 	};
 };

board/st/stm32f746-disco/stm32f746-disco.c

@@ -245,48 +245,16 @@ int uart_setup_gpio(void)
 }
 
 #ifdef CONFIG_ETH_DESIGNWARE
-const struct stm32_gpio_ctl gpio_ctl_eth = {
-	.mode = STM32_GPIO_MODE_AF,
-	.otype = STM32_GPIO_OTYPE_PP,
-	.speed = STM32_GPIO_SPEED_100M,
-	.pupd = STM32_GPIO_PUPD_NO,
-	.af = STM32_GPIO_AF11
-};
-
-static const struct stm32_gpio_dsc eth_gpio[] = {
-	{STM32_GPIO_PORT_A, STM32_GPIO_PIN_1},	/* ETH_RMII_REF_CLK */
-	{STM32_GPIO_PORT_A, STM32_GPIO_PIN_2},	/* ETH_MDIO */
-	{STM32_GPIO_PORT_A, STM32_GPIO_PIN_7},	/* ETH_RMII_CRS_DV */
-
-	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_1},	/* ETH_MDC */
-	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_4},	/* ETH_RMII_RXD0 */
-	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_5},	/* ETH_RMII_RXD1 */
-
-	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_11},	/* ETH_RMII_TX_EN */
-	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_13},	/* ETH_RMII_TXD0 */
-	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_14},	/* ETH_RMII_TXD1 */
-};
 
 static int stmmac_setup(void)
 {
-	int res = 0;
-	int i;
-
 	clock_setup(SYSCFG_CLOCK_CFG);
-
 	/* Set >RMII mode */
 	STM32_SYSCFG->pmc |= SYSCFG_PMC_MII_RMII_SEL;
 
 	clock_setup(GPIO_A_CLOCK_CFG);
 	clock_setup(GPIO_C_CLOCK_CFG);
 	clock_setup(GPIO_G_CLOCK_CFG);
-
-	for (i = 0; i < ARRAY_SIZE(eth_gpio); i++) {
-		res = stm32_gpio_config(&eth_gpio[i], &gpio_ctl_eth);
-		if (res)
-			return res;
-	}
-
 	clock_setup(STMMAC_CLOCK_CFG);
 
 	return 0;