imx: imx6sx-sabreauto: convert to use DM QSPI driver

To support DM QSPI driver:
 - Add -u-boot.dtsi to modify n25q256a@0 and n25q256a@1 compatible string
   to "spi-flash" and add "num-cs" property.
 - Enable DM SPI and DM SPI FLASH configurations
 - Remove iomux settings of qspi1 in board codes which is not needed
   for DM driver.

Signed-off-by: Ye Li <ye.li@nxp.com>

arch/arm/dts/imx6sx-sabreauto-u-boot.dtsi

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 NXP
+ */
+
+&qspi1 {
+	num-cs = <2>;
+
+	flash0: n25q256a@0 {
+		compatible = "spi-flash";
+	};
+
+	flash1: n25q256a@1 {
+		compatible = "spi-flash";
+	};
+};

arch/arm/dts/imx6sx-sabreauto.dts

@@ -96,6 +96,29 @@
 	};
 };
 
+&qspi1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_qspi1_1>;
+	status = "okay";
+	ddrsmp=<2>;
+
+	flash0: n25q256a@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "micron,n25q256a";
+		spi-max-frequency = <29000000>;
+		reg = <0>;
+	};
+
+	flash1: n25q256a@1 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "micron,n25q256a";
+		spi-max-frequency = <29000000>;
+		reg = <1>;
+	};
+};
+
 &iomuxc {
 	imx6x-sabreauto {
 		pinctrl_i2c2_1: i2c2grp-1 {
@@ -112,6 +135,23 @@
 			>;
 		};
 
+		pinctrl_qspi1_1: qspi1grp_1 {
+			fsl,pins = <
+				MX6SX_PAD_QSPI1A_DATA0__QSPI1_A_DATA_0  0x70a1
+				MX6SX_PAD_QSPI1A_DATA1__QSPI1_A_DATA_1  0x70a1
+				MX6SX_PAD_QSPI1A_DATA2__QSPI1_A_DATA_2  0x70a1
+				MX6SX_PAD_QSPI1A_DATA3__QSPI1_A_DATA_3  0x70a1
+				MX6SX_PAD_QSPI1A_SCLK__QSPI1_A_SCLK     0x70a1
+				MX6SX_PAD_QSPI1A_SS0_B__QSPI1_A_SS0_B   0x70a1
+				MX6SX_PAD_QSPI1B_DATA0__QSPI1_B_DATA_0  0x70a1
+				MX6SX_PAD_QSPI1B_DATA1__QSPI1_B_DATA_1  0x70a1
+				MX6SX_PAD_QSPI1B_DATA2__QSPI1_B_DATA_2  0x70a1
+				MX6SX_PAD_QSPI1B_DATA3__QSPI1_B_DATA_3  0x70a1
+				MX6SX_PAD_QSPI1B_SCLK__QSPI1_B_SCLK     0x70a1
+				MX6SX_PAD_QSPI1B_SS0_B__QSPI1_B_SS0_B   0x70a1
+			>;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX6SX_PAD_GPIO1_IO04__UART1_TX		0x1b0b1

board/freescale/mx6sxsabreauto/mx6sxsabreauto.c

@@ -218,32 +218,8 @@ int board_early_init_f(void)
 }
 
 #ifdef CONFIG_FSL_QSPI
-
-#define QSPI_PAD_CTRL1	\
-	(PAD_CTL_SRE_FAST | PAD_CTL_SPEED_HIGH | \
-	 PAD_CTL_PKE | PAD_CTL_PUE | PAD_CTL_PUS_47K_UP | PAD_CTL_DSE_40ohm)
-
-static iomux_v3_cfg_t const quadspi_pads[] = {
-	MX6_PAD_QSPI1A_SS0_B__QSPI1_A_SS0_B   | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1A_SCLK__QSPI1_A_SCLK     | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1A_DATA0__QSPI1_A_DATA_0  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1A_DATA1__QSPI1_A_DATA_1  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1A_DATA2__QSPI1_A_DATA_2  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1A_DATA3__QSPI1_A_DATA_3  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1B_SS0_B__QSPI1_B_SS0_B   | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1B_SCLK__QSPI1_B_SCLK     | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1B_DATA0__QSPI1_B_DATA_0  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1B_DATA1__QSPI1_B_DATA_1  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1B_DATA2__QSPI1_B_DATA_2  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-	MX6_PAD_QSPI1B_DATA3__QSPI1_B_DATA_3  | MUX_PAD_CTRL(QSPI_PAD_CTRL1),
-};
-
 int board_qspi_init(void)
 {
-	/* Set the iomux */
-	imx_iomux_v3_setup_multiple_pads(quadspi_pads,
-					 ARRAY_SIZE(quadspi_pads));
-
 	/* Set the clock */
 	enable_qspi_clk(0);
 

configs/mx6sxsabreauto_defconfig

@@ -36,6 +36,8 @@ CONFIG_DM_MMC=y
 CONFIG_FSL_ESDHC=y
 CONFIG_NAND=y
 CONFIG_NAND_MXS=y
+CONFIG_DM_SPI=y
+CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_STMICRO=y