sunxi: Add support for A20-OLinuXino-MICRO-eMMC

From rev.J A20-OLinuXino-MICRO has eMMC option. For now this is
only 4GB, but in the future size may increase.

The dts file is the same from mainline kernel.

Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/dts/sun7i-a20-olinuxino-micro-emmc.dts

@@ -0,0 +1,70 @@
+ /*
+ * Copyright 2017 Olimex Ltd.
+ * Stefan Mavrodiev <stefan@olimex.com>
+ *
+ * This file is dual-licensed: you can use it either under the terms
+ * of the GPL or the X11 license, at your option. Note that this dual
+ * licensing only applies to this file, and not this project as a
+ * whole.
+ *
+ *  a) This file is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License as
+ *     published by the Free Software Foundation; either version 2 of the
+ *     License, or (at your option) any later version.
+ *
+ *     This file is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ * Or, alternatively,
+ *
+ *  b) Permission is hereby granted, free of charge, to any person
+ *     obtaining a copy of this software and associated documentation
+ *     files (the "Software"), to deal in the Software without
+ *     restriction, including without limitation the rights to use,
+ *     copy, modify, merge, publish, distribute, sublicense, and/or
+ *     sell copies of the Software, and to permit persons to whom the
+ *     Software is furnished to do so, subject to the following
+ *     conditions:
+ *
+ *     The above copyright notice and this permission notice shall be
+ *     included in all copies or substantial portions of the Software.
+ *
+ *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *     OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "sun7i-a20-olinuxino-micro.dts"
+
+/ {
+	model = "Olimex A20-OLinuXino-MICRO-eMMC";
+	compatible = "olimex,a20-olinuxino-micro-emmc", "allwinner,sun7i-a20";
+
+	mmc2_pwrseq: pwrseq {
+		compatible = "mmc-pwrseq-emmc";
+		reset-gpios = <&pio 2 16 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&mmc2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&mmc2_pins_a>;
+	vmmc-supply = <&reg_vcc3v3>;
+	bus-width = <4>;
+	non-removable;
+	mmc-pwrseq = <&mmc2_pwrseq>;
+	status = "okay";
+
+	emmc: emmc@0 {
+		reg = <0>;
+		compatible = "mmc-card";
+		broken-hpi;
+	};
+};

configs/A20-OLinuXino_MICRO-eMMC_defconfig

@@ -0,0 +1,27 @@
+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_MACH_SUN7I=y
+CONFIG_DRAM_CLK=384
+CONFIG_MMC0_CD_PIN="PH1"
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
+CONFIG_I2C1_ENABLE=y
+CONFIG_VIDEO_VGA=y
+CONFIG_SATAPWR="PB8"
+CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-olinuxino-micro"
+CONFIG_AHCI=y
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SPL=y
+CONFIG_SPL_I2C_SUPPORT=y
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_FPGA is not set
+# CONFIG_SPL_DOS_PARTITION is not set
+# CONFIG_SPL_ISO_PARTITION is not set
+# CONFIG_SPL_EFI_PARTITION is not set
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_SUN7I_GMAC=y
+CONFIG_AXP_ALDO3_VOLT=2800
+CONFIG_AXP_ALDO4_VOLT=2800
+CONFIG_SCSI=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE=y