Merge git://git.denx.de/u-boot-dm

24 files changed, 371 insertions, 40 deletions

diff --git a/configs/minnowmax_defconfig b/configs/minnowmax_defconfig
index 7bc9085..d124289 100644
--- a/configs/minnowmax_defconfig
+++ b/configs/minnowmax_defconfig
@@ -7,7 +7,5 @@ CONFIG_DEFAULT_DEVICE_TREE="minnowmax"
 CONFIG_VIDEO_X86=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
 CONFIG_FRAMEBUFFER_VESA_MODE_11A=y
-CONFIG_DEBUG_UART_NS16550=y
-CONFIG_DEBUG_UART=y
 CONFIG_MMCONF_BASE_ADDRESS=0xe0000000
 CONFIG_HAVE_INTEL_ME=y
diff --git a/configs/mx6sxsabresd_defconfig b/configs/mx6sxsabresd_defconfig
index 72e0f10..cc82322 100644
--- a/configs/mx6sxsabresd_defconfig
+++ b/configs/mx6sxsabresd_defconfig
@@ -3,3 +3,5 @@ CONFIG_ARM=y
 CONFIG_TARGET_MX6SXSABRESD=y
 CONFIG_SYS_MALLOC_F=y
 CONFIG_SYS_MALLOC_F_LEN=0x400
+CONFIG_DM=y
+CONFIG_DM_THERMAL=y
diff --git a/configs/mx6sxsabresd_spl_defconfig b/configs/mx6sxsabresd_spl_defconfig
index 6b36e06..901b01b 100644
--- a/configs/mx6sxsabresd_spl_defconfig
+++ b/configs/mx6sxsabresd_spl_defconfig
@@ -2,3 +2,5 @@ CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/imx-common/spl_sd.cfg,MX6SX"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_MX6SXSABRESD=y
+CONFIG_DM=y
+CONFIG_DM_THERMAL=y
diff --git a/configs/odroid_defconfig b/configs/odroid_defconfig
index a842837..816a3fa 100644
--- a/configs/odroid_defconfig
+++ b/configs/odroid_defconfig
@@ -3,3 +3,5 @@ CONFIG_ARCH_EXYNOS=y
 CONFIG_TARGET_ODROID=y
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="exynos4412-odroid"
+CONFIG_DM_I2C=y
+CONFIG_DM_I2C_COMPAT=y
diff --git a/configs/peach-pi_defconfig b/configs/peach-pi_defconfig
index 8ada0db..333e335 100644
--- a/configs/peach-pi_defconfig
+++ b/configs/peach-pi_defconfig
@@ -3,3 +3,7 @@ CONFIG_SPL=y
 +S:CONFIG_ARCH_EXYNOS=y
 +S:CONFIG_TARGET_PEACH_PI=y
 CONFIG_DEFAULT_DEVICE_TREE="exynos5800-peach-pi"
+CONFIG_CROS_EC=y
+CONFIG_CROS_EC_SPI=y
+CONFIG_CROS_EC_KEYB=y
+CONFIG_CMD_CROS_EC=y
diff --git a/configs/peach-pit_defconfig b/configs/peach-pit_defconfig
index b944b3b..cf84444 100644
--- a/configs/peach-pit_defconfig
+++ b/configs/peach-pit_defconfig
@@ -3,3 +3,7 @@ CONFIG_SPL=y
 +S:CONFIG_ARCH_EXYNOS=y
 +S:CONFIG_TARGET_PEACH_PIT=y
 CONFIG_DEFAULT_DEVICE_TREE="exynos5420-peach-pit"
+CONFIG_CROS_EC=y
+CONFIG_CROS_EC_SPI=y
+CONFIG_CROS_EC_KEYB=y
+CONFIG_CMD_CROS_EC=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 0bf5ea3..70f5b86 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -7,3 +7,8 @@ CONFIG_DM=y
 CONFIG_DEFAULT_DEVICE_TREE="sandbox"
 CONFIG_SYS_MALLOC_F=y
 CONFIG_SYS_MALLOC_F_LEN=0x400
+CONFIG_CROS_EC=y
+CONFIG_DM_CROS_EC=y
+CONFIG_CROS_EC_SANDBOX=y
+CONFIG_CROS_EC_KEYB=y
+CONFIG_CMD_CROS_EC=y
diff --git a/configs/snow_defconfig b/configs/snow_defconfig
index 14ed793..353ddb0 100644
--- a/configs/snow_defconfig
+++ b/configs/snow_defconfig
@@ -3,3 +3,8 @@ CONFIG_SPL=y
 +S:CONFIG_ARCH_EXYNOS=y
 +S:CONFIG_TARGET_SNOW=y
 CONFIG_DEFAULT_DEVICE_TREE="exynos5250-snow"
+CONFIG_CROS_EC=y
+CONFIG_DM_CROS_EC=y
+CONFIG_CROS_EC_I2C=y
+CONFIG_CROS_EC_KEYB=y
+CONFIG_CMD_CROS_EC=y
diff --git a/doc/device-tree-bindings/gpio/gpio.txt b/doc/device-tree-bindings/gpio/gpio.txt
index b9bd1d6..f7a158d 100644
--- a/doc/device-tree-bindings/gpio/gpio.txt
+++ b/doc/device-tree-bindings/gpio/gpio.txt
@@ -69,7 +69,8 @@ GPIO pin number, and GPIO flags as accepted by the "qe_pio_e" gpio-controller.
 ----------------------------------
 
 A gpio-specifier should contain a flag indicating the GPIO polarity; active-
-high or active-low. If it does, the follow best practices should be followed:
+high or active-low. If it does, the following best practices should be
+followed:
 
 The gpio-specifier's polarity flag should represent the physical level at the
 GPIO controller that achieves (or represents, for inputs) a logically asserted
@@ -147,7 +148,7 @@ contains information structures as follows:
 	numeric-gpio-range ::=
 			<pinctrl-phandle> <gpio-base> <pinctrl-base> <count>
 	named-gpio-range ::= <pinctrl-phandle> <gpio-base> '<0 0>'
-	gpio-phandle : phandle to pin controller node.
+	pinctrl-phandle : phandle to pin controller node
 	gpio-base : Base GPIO ID in the GPIO controller
 	pinctrl-base : Base pinctrl pin ID in the pin controller
 	count : The number of GPIOs/pins in this range
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 2cc776c..692810d 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -13,6 +13,15 @@ config DM_I2C
 	  enabled together (it is not possible to use driver model
 	  for one and not the other).
 
+config DM_I2C_COMPAT
+	bool "Enable I2C compatibility layer"
+	depends on DM
+	help
+	  Enable old-style I2C functions for compatibility with existing code.
+	  This option can be enabled as a temporary measure to avoid needing
+	  to convert all code for a board in a single commit. It should not
+	  be enabled for any board in an official release.
+
 config SYS_I2C_UNIPHIER
 	bool "UniPhier I2C driver"
 	depends on ARCH_UNIPHIER && DM_I2C
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index e69de29..bb00de7 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -0,0 +1,6 @@
+config CROS_EC_KEYB
+	bool "Enable Chrome OS EC keyboard support"
+	help
+	  Most ARM Chromebooks use an EC to provide access to the keyboard.
+	  Messages are used to request key scans from the EC and these are
+	  then decoded into keys by this driver.
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 813d1c2..0df25c3 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -1,3 +1,49 @@
+config CMD_CROS_EC
+	bool "Enable crosec command"
+	depends on CROS_EC
+	help
+	  Enable command-line access to the Chrome OS EC (Embedded
+	  Controller). This provides the 'crosec' command which has
+	  a number of sub-commands for performing EC tasks such as
+	  updating its flash, accessing a small saved context area
+	  and talking to the I2C bus behind the EC (if there is one).
+
+config CROS_EC
+	bool "Enable Chrome OS EC"
+	help
+	  Enable access to the Chrome OS EC. This is a separate
+	  microcontroller typically available on a SPI bus on Chromebooks. It
+	  provides access to the keyboard, some internal storage and may
+	  control access to the battery and main PMIC depending on the
+	  device. You can use the 'crosec' command to access it.
+
+config CROS_EC_I2C
+	bool "Enable Chrome OS EC I2C driver"
+	depends on CROS_EC
+	help
+	  Enable I2C access to the Chrome OS EC. This is used on older
+	  ARM Chromebooks such as snow and spring before the standard bus
+	  changed to SPI. The EC will accept commands across the I2C using
+	  a special message protocol, and provide responses.
+
+config CROS_EC_LPC
+	bool "Enable Chrome OS EC LPC driver"
+	depends on CROS_EC
+	help
+	  Enable I2C access to the Chrome OS EC. This is used on x86
+	  Chromebooks such as link and falco. The keyboard is provided
+	  through a legacy port interface, so on x86 machines the main
+	  function of the EC is power and thermal management.
+
+config CROS_EC_SPI
+	bool "Enable Chrome OS EC SPI driver"
+	depends on CROS_EC
+	help
+	  Enable SPI access to the Chrome OS EC. This is used on newer
+	  ARM Chromebooks such as pit, pi and nyan-big. The SPI interface
+	  provides a faster and more robust interface than I2C but the bugs
+	  are less interesting.
+
 config DM_CROS_EC
 	bool "Enable Driver Model for Chrome OS EC"
 	depends on DM
@@ -5,5 +51,5 @@ config DM_CROS_EC
 	  Enable driver model for the Chrome OS EC interface. This
 	  allows the cros_ec SPI driver to operate with CONFIG_DM_SPI
 	  but otherwise makes few changes. Since cros_ec also supports
-	  I2C and LPC (which don't support driver model yet), a full
+	  LPC (which doesn't support driver model yet), a full
 	  conversion is not yet possible.
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index c94353b..1686a1f 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -7,6 +7,65 @@ config DM_SERIAL
 	  implements serial_putc() etc. The uclass interface is
 	  defined in include/serial.h.
 
+config DEBUG_UART
+	bool "Enable an early debug UART for debugging"
+	help
+	  The debug UART is intended for use very early in U-Boot to debug
+	  problems when an ICE or other debug mechanism is not available.
+
+	  To use it you should:
+	  - Make sure your UART supports this interface
+	  - Enable CONFIG_DEBUG_UART
+	  - Enable the CONFIG for your UART to tell it to provide this interface
+	        (e.g. CONFIG_DEBUG_UART_NS16550)
+	  - Define the required settings as needed (see below)
+	  - Call debug_uart_init() before use
+	  - Call debug_uart_putc() to output a character
+
+	  Depending on your platform it may be possible to use this UART before
+	  a stack is available.
+
+	  If your UART does not support this interface you can probably add
+	  support quite easily. Remember that you cannot use driver model and
+	  it is preferred to use no stack.
+
+	  You must not use this UART once driver model is working and the
+	  serial drivers are up and running (done in serial_init()). Otherwise
+	  the drivers may conflict and you will get strange output.
+
+choice
+	prompt "Select which UART will provide the debug UART"
+	depends on DEBUG_UART
+
+config DEBUG_UART_NS16550
+	bool "ns16550"
+	help
+	  Select this to enable a debug UART using the ns16550 driver. You
+	  will need to provide parameters to make this work. The driver will
+	  be available until the real driver model serial is running.
+
+endchoice
+
+config DEBUG_UART_BASE
+	hex "Base address of UART"
+	depends on DEBUG_UART
+	help
+	  This is the base address of your UART for memory-mapped UARTs.
+
+	  A default should be provided by your board, but if not you will need
+	  to use the correct value here.
+
+config DEBUG_UART_CLOCK
+	int "UART input clock"
+	depends on DEBUG_UART
+	help
+	  The UART input clock determines the speed of the internal UART
+	  circuitry. The baud rate is derived from this by dividing the input
+	  clock down.
+
+	  A default should be provided by your board, but if not you will need
+	  to use the correct value here.
+
 config UNIPHIER_SERIAL
 	bool "UniPhier on-chip UART support"
 	depends on ARCH_UNIPHIER && DM_SERIAL
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 70c9462..eb00f1c 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -55,17 +55,9 @@ DECLARE_GLOBAL_DATA_PTR;
 #endif /* CONFIG_SYS_NS16550_IER */
 
 #ifdef CONFIG_DM_SERIAL
-static void ns16550_writeb(NS16550_t port, int offset, int value)
-{
-	struct ns16550_platdata *plat = port->plat;
-	unsigned char *addr;
 
-	offset *= 1 << plat->reg_shift;
-	addr = map_sysmem(plat->base, 0) + offset;
-	/*
-	 * As far as we know it doesn't make sense to support selection of
-	 * these options at run-time, so use the existing CONFIG options.
-	 */
+static inline void serial_out_shift(unsigned char *addr, int shift, int value)
+{
 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
 	outb(value, (ulong)addr);
 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
@@ -73,19 +65,14 @@ static void ns16550_writeb(NS16550_t port, int offset, int value)
 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
 	out_be32(addr, value);
 #elif defined(CONFIG_SYS_BIG_ENDIAN)
-	writeb(value, addr + (1 << plat->reg_shift) - 1);
+	writeb(value, addr + (1 << shift) - 1);
 #else
 	writeb(value, addr);
 #endif
 }
 
-static int ns16550_readb(NS16550_t port, int offset)
+static inline int serial_in_shift(unsigned char *addr, int shift)
 {
-	struct ns16550_platdata *plat = port->plat;
-	unsigned char *addr;
-
-	offset *= 1 << plat->reg_shift;
-	addr = map_sysmem(plat->base, 0) + offset;
 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
 	return inb((ulong)addr);
 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
@@ -93,12 +80,37 @@ static int ns16550_readb(NS16550_t port, int offset)
 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
 	return in_be32(addr);
 #elif defined(CONFIG_SYS_BIG_ENDIAN)
-	return readb(addr + (1 << plat->reg_shift) - 1);
+	return readb(addr + (1 << reg_shift) - 1);
 #else
 	return readb(addr);
 #endif
 }
 
+static void ns16550_writeb(NS16550_t port, int offset, int value)
+{
+	struct ns16550_platdata *plat = port->plat;
+	unsigned char *addr;
+
+	offset *= 1 << plat->reg_shift;
+	addr = map_sysmem(plat->base, 0) + offset;
+	/*
+	 * As far as we know it doesn't make sense to support selection of
+	 * these options at run-time, so use the existing CONFIG options.
+	 */
+	serial_out_shift(addr, plat->reg_shift, value);
+}
+
+static int ns16550_readb(NS16550_t port, int offset)
+{
+	struct ns16550_platdata *plat = port->plat;
+	unsigned char *addr;
+
+	offset *= 1 << plat->reg_shift;
+	addr = map_sysmem(plat->base, 0) + offset;
+
+	return serial_in_shift(addr, plat->reg_shift);
+}
+
 /* We can clean these up once everything is moved to driver model */
 #define serial_out(value, addr)	\
 	ns16550_writeb(com_port, addr - (unsigned char *)com_port, value)
@@ -106,10 +118,15 @@ static int ns16550_readb(NS16550_t port, int offset)
 	ns16550_readb(com_port, addr - (unsigned char *)com_port)
 #endif
 
-int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
+static inline int calc_divisor(NS16550_t port, int clock, int baudrate)
 {
 	const unsigned int mode_x_div = 16;
 
+	return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
+}
+
+int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
+{
 #ifdef CONFIG_OMAP1510
 	/* If can't cleanly clock 115200 set div to 1 */
 	if ((clock == 12000000) && (baudrate == 115200)) {
@@ -119,7 +136,7 @@ int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
 	port->osc_12m_sel = 0;			/* clear if previsouly set */
 #endif
 
-	return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
+	return calc_divisor(port, clock, baudrate);
 }
 
 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
@@ -219,6 +236,47 @@ int NS16550_tstc(NS16550_t com_port)
 
 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
 
+#ifdef CONFIG_DEBUG_UART_NS16550
+
+#include <debug_uart.h>
+
+void debug_uart_init(void)
+{
+	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
+	int baud_divisor;
+
+	/*
+	 * We copy the code from above because it is already horribly messy.
+	 * Trying to refactor to nicely remove the duplication doesn't seem
+	 * feasible. The better fix is to move all users of this driver to
+	 * driver model.
+	 */
+	baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
+				    CONFIG_BAUDRATE);
+
+	serial_out_shift(&com_port->ier, 0, CONFIG_SYS_NS16550_IER);
+	serial_out_shift(&com_port->mcr, 0, UART_MCRVAL);
+	serial_out_shift(&com_port->fcr, 0, UART_FCRVAL);
+
+	serial_out_shift(&com_port->lcr, 0, UART_LCR_BKSE | UART_LCRVAL);
+	serial_out_shift(&com_port->dll, 0, baud_divisor & 0xff);
+	serial_out_shift(&com_port->dlm, 0, (baud_divisor >> 8) & 0xff);
+	serial_out_shift(&com_port->lcr, 0, UART_LCRVAL);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
+
+	while (!(serial_in_shift(&com_port->lsr, 0) & UART_LSR_THRE))
+		;
+	serial_out_shift(&com_port->thr, 0, ch);
+}
+
+DEBUG_UART_FUNCS
+
+#endif
+
 #ifdef CONFIG_DM_SERIAL
 static int ns16550_serial_putc(struct udevice *dev, const char ch)
 {
diff --git a/include/configs/exynos5-common.h b/include/configs/exynos5-common.h
index 0ba39a2..3ab8d55 100644
--- a/include/configs/exynos5-common.h
+++ b/include/configs/exynos5-common.h
@@ -126,6 +126,8 @@
 #define SPI_FLASH_UBOOT_POS	(CONFIG_SEC_FW_SIZE + CONFIG_BL1_SIZE)
 
 /* I2C */
+
+/* TODO(sjg@chromium.org): Move these two options to Kconfig */
 #define CONFIG_DM_I2C
 #define CONFIG_DM_I2C_COMPAT
 #define CONFIG_CMD_I2C
diff --git a/include/configs/exynos5-dt-common.h b/include/configs/exynos5-dt-common.h
index 9cef0b0..b1b8e1a 100644
--- a/include/configs/exynos5-dt-common.h
+++ b/include/configs/exynos5-dt-common.h
@@ -24,9 +24,6 @@
 #define CONFIG_POWER_TPS65090
 
 /* Enable keyboard */
-#define CONFIG_CROS_EC		/* CROS_EC protocol */
-#define CONFIG_CROS_EC_KEYB	/* CROS_EC keyboard input */
-#define CONFIG_CMD_CROS_EC
 #define CONFIG_KEYBOARD
 
 #endif
diff --git a/include/configs/mx6sxsabresd.h b/include/configs/mx6sxsabresd.h
index 1005b9e..a290129 100644
--- a/include/configs/mx6sxsabresd.h
+++ b/include/configs/mx6sxsabresd.h
@@ -227,8 +227,6 @@
 #define CONFIG_PCIE_IMX_POWER_GPIO	IMX_GPIO_NR(2, 1)
 #endif
 
-#define CONFIG_DM
-#define CONFIG_DM_THERMAL
 #define CONFIG_IMX6_THERMAL
 
 #define CONFIG_CMD_FUSE
diff --git a/include/configs/odroid.h b/include/configs/odroid.h
index 9d5dbdc..8b47537 100644
--- a/include/configs/odroid.h
+++ b/include/configs/odroid.h
@@ -177,8 +177,6 @@
 
 /* I2C */
 #define CONFIG_CMD_I2C
-#define CONFIG_DM_I2C
-#define CONFIG_DM_I2C_COMPAT
 #define CONFIG_SYS_I2C_S3C24X0
 #define CONFIG_SYS_I2C_S3C24X0_SPEED	100000
 #define CONFIG_SYS_I2C_S3C24X0_SLAVE	0
diff --git a/include/configs/peach-pi.h b/include/configs/peach-pi.h
index f724164..f04f061 100644
--- a/include/configs/peach-pi.h
+++ b/include/configs/peach-pi.h
@@ -43,7 +43,6 @@
 #endif
 
 #define CONFIG_POWER_TPS65090_EC
-#define CONFIG_CROS_EC_SPI		/* Support CROS_EC over SPI */
 
 #define CONFIG_USB_XHCI
 #define CONFIG_USB_XHCI_EXYNOS
diff --git a/include/configs/peach-pit.h b/include/configs/peach-pit.h
index de12a9e..b5efbdc 100644
--- a/include/configs/peach-pit.h
+++ b/include/configs/peach-pit.h
@@ -43,7 +43,6 @@
 #endif
 
 #define CONFIG_POWER_TPS65090_EC
-#define CONFIG_CROS_EC_SPI		/* Support CROS_EC over SPI */
 
 #define CONFIG_USB_XHCI
 #define CONFIG_USB_XHCI_EXYNOS
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 5c11650..febbfb6 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -141,9 +141,6 @@
 
 #define CONFIG_BOOTARGS ""
 
-#define CONFIG_CROS_EC
-#define CONFIG_CMD_CROS_EC
-#define CONFIG_CROS_EC_SANDBOX
 #define CONFIG_ARCH_EARLY_INIT_R
 #define CONFIG_BOARD_LATE_INIT
 
@@ -166,7 +163,6 @@
 #define LCD_BPP			LCD_COLOR16
 #define CONFIG_LCD_BMP_RLE8
 
-#define CONFIG_CROS_EC_KEYB
 #define CONFIG_KEYBOARD
 
 #define CONFIG_EXTRA_ENV_SETTINGS	"stdin=serial,cros-ec-keyb\0" \
diff --git a/include/configs/snow.h b/include/configs/snow.h
index ce6676e..fe802f2 100644
--- a/include/configs/snow.h
+++ b/include/configs/snow.h
@@ -20,9 +20,7 @@
 #include <configs/exynos5-dt-common.h>
 
 
-#define CONFIG_CROS_EC_I2C		/* Support CROS_EC over I2C */
 #define CONFIG_POWER_TPS65090_I2C
-#define CONFIG_DM_CROS_EC
 
 #define CONFIG_BOARD_COMMON
 #define CONFIG_ARCH_EARLY_INIT_R
diff --git a/include/debug_uart.h b/include/debug_uart.h
new file mode 100644
index 0000000..f56797b
--- /dev/null
+++ b/include/debug_uart.h
@@ -0,0 +1,139 @@
+/*
+ * Early debug UART support
+ *
+ * (C) Copyright 2014 Google, Inc
+ * Writte by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _DEBUG_UART_H
+#define _DEBUG_UART_H
+
+#include <linux/linkage.h>
+
+/*
+ * The debug UART is intended for use very early in U-Boot to debug problems
+ * when an ICE or other debug mechanism is not available.
+ *
+ * To use it you should:
+ * - Make sure your UART supports this interface
+ * - Enable CONFIG_DEBUG_UART
+ * - Enable the CONFIG for your UART to tell it to provide this interface
+ *       (e.g. CONFIG_DEBUG_UART_NS16550)
+ * - Define the required settings as needed (see below)
+ * - Call debug_uart_init() before use
+ * - Call printch() to output a character
+ *
+ * Depending on your platform it may be possible to use this UART before a
+ * stack is available.
+ *
+ * If your UART does not support this interface you can probably add support
+ * quite easily. Remember that you cannot use driver model and it is preferred
+ * to use no stack.
+ *
+ * You must not use this UART once driver model is working and the serial
+ * drivers are up and running (done in serial_init()). Otherwise the drivers
+ * may conflict and you will get strange output.
+ *
+ *
+ * To enable the debug UART in your serial driver:
+ *
+ * - #include <debug_uart.h>
+ * - Define debug_uart_init(), trying to avoid using the stack
+ * - Define _debug_uart_putc() as static inline (avoiding stack usage)
+ * - Immediately afterwards, add DEBUG_UART_FUNCS to define the rest of the
+ *     functionality (printch(), etc.)
+ */
+
+/**
+ * debug_uart_init() - Set up the debug UART ready for use
+ *
+ * This sets up the UART with the correct baud rate, etc.
+ *
+ * Available CONFIG is:
+ *
+ *    - CONFIG_DEBUG_UART_BASE: Base address of UART
+ *    - CONFIG_BAUDRATE: Requested baud rate
+ *    - CONFIG_DEBUG_UART_CLOCK: Input clock for UART
+ */
+void debug_uart_init(void);
+
+/**
+ * printch() - Output a character to the debug UART
+ *
+ * @ch:		Character to output
+ */
+asmlinkage void printch(int ch);
+
+/**
+ * printascii() - Output an ASCII string to the debug UART
+ *
+ * @str:	String to output
+ */
+asmlinkage void printascii(const char *str);
+
+/**
+ * printhex2() - Output a 2-digit hex value
+ *
+ * @value:	Value to output
+ */
+asmlinkage void printhex2(uint value);
+
+/**
+ * printhex4() - Output a 4-digit hex value
+ *
+ * @value:	Value to output
+ */
+asmlinkage void printhex4(uint value);
+
+/**
+ * printhex8() - Output a 8-digit hex value
+ *
+ * @value:	Value to output
+ */
+asmlinkage void printhex8(uint value);
+
+/*
+ * Now define some functions - this should be inserted into the serial driver
+ */
+#define DEBUG_UART_FUNCS \
+	asmlinkage void printch(int ch) \
+	{ \
+		_debug_uart_putc(ch); \
+	} \
+\
+	asmlinkage void printascii(const char *str) \
+	{ \
+		while (*str) \
+			_debug_uart_putc(*str++); \
+	} \
+\
+	static inline void printhex1(uint digit) \
+	{ \
+		digit &= 0xf; \
+		_debug_uart_putc(digit > 9 ? digit - 10 + 'a' : digit + '0'); \
+	} \
+\
+	static inline void printhex(uint value, int digits) \
+	{ \
+		while (digits-- > 0) \
+			printhex1(value >> (4 * digits)); \
+	} \
+\
+	asmlinkage void printhex2(uint value) \
+	{ \
+		printhex(value, 2); \
+	} \
+\
+	asmlinkage void printhex4(uint value) \
+	{ \
+		printhex(value, 4); \
+	} \
+\
+	asmlinkage void printhex8(uint value) \
+	{ \
+		printhex(value, 8); \
+	}
+
+#endif
diff --git a/include/dm/device-internal.h b/include/dm/device-internal.h
index f0cc794..e2418fe 100644
--- a/include/dm/device-internal.h
+++ b/include/dm/device-internal.h
@@ -101,7 +101,11 @@ static inline int device_remove(struct udevice *dev) { return 0; }
  * @dev: Pointer to device to unbind
  * @return 0 if OK, -ve on error
  */
+#ifdef CONFIG_DM_DEVICE_REMOVE
 int device_unbind(struct udevice *dev);
+#else
+static inline int device_unbind(struct udevice *dev) { return 0; }
+#endif
 
 #ifdef CONFIG_DM_DEVICE_REMOVE
 void device_free(struct udevice *dev);