serial: New serial driver MAX310X

This driver is a replacement for a MAX3107 driver with a lot of
improvements and new features.
The main differences from the old version:
- Using the regmap.
- Using devm_XXX-related functions.
- The use of threaded IRQ with IRQF_ONESHOT flag allows the driver to
  the hardware that supports only level IRQ.
- Improved error handling of serial port, improved FIFO handling,
  improved hardware & software flow control.
- Advanced flags allows turn on RS-485 mode (Auto direction control).
- Ability to load multiple instances of drivers.
- Added support for MAX3108.
- GPIO support.
- Driver is quite ready for adding I2C support and support other ICs
  with compatible registers set (MAX3109, MAX14830).

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 69 insertions, 2 deletions

diff --git a/include/linux/platform_data/max310x.h b/include/linux/platform_data/max310x.h
new file mode 100644
index 000000000000..91648bf5fc5c
--- /dev/null
+++ b/include/linux/platform_data/max310x.h
@@ -0,0 +1,67 @@
+/*
+ *  Maxim (Dallas) MAX3107/8 serial driver
+ *
+ *  Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ *
+ *  Based on max3100.c, by Christian Pellegrin <chripell@evolware.org>
+ *  Based on max3110.c, by Feng Tang <feng.tang@intel.com>
+ *  Based on max3107.c, by Aavamobile
+ *
+ *  This program 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.
+ */
+
+#ifndef _MAX310X_H_
+#define _MAX310X_H_
+
+/*
+ * Example board initialization data:
+ *
+ * static struct max310x_pdata max3107_pdata = {
+ *	.driver_flags	= MAX310X_EXT_CLK,
+ *	.uart_flags[0]	= MAX310X_ECHO_SUPRESS | MAX310X_AUTO_DIR_CTRL,
+ *	.frequency	= 3686400,
+ *	.gpio_base	= -1,
+ * };
+ *
+ * static struct spi_board_info spi_device_max3107[] = {
+ *	{
+ *		.modalias	= "max3107",
+ *		.irq		= IRQ_EINT3,
+ *		.bus_num	= 1,
+ *		.chip_select	= 1,
+ *		.platform_data	= &max3107_pdata,
+ *	},
+ * };
+ */
+
+#define MAX310X_MAX_UARTS	1
+
+/* MAX310X platform data structure */
+struct max310x_pdata {
+	/* Flags global to driver */
+	const u8		driver_flags:2;
+#define MAX310X_EXT_CLK		(0x00000001)	/* External clock enable */
+#define MAX310X_AUTOSLEEP	(0x00000002)	/* Enable AutoSleep mode */
+	/* Flags global to UART port */
+	const u8		uart_flags[MAX310X_MAX_UARTS];
+#define MAX310X_LOOPBACK	(0x00000001)	/* Loopback mode enable */
+#define MAX310X_ECHO_SUPRESS	(0x00000002)	/* Enable echo supress */
+#define MAX310X_AUTO_DIR_CTRL	(0x00000004)	/* Enable Auto direction
+						 * control (RS-485)
+						 */
+	/* Frequency (extrenal clock or crystal) */
+	const int		frequency;
+	/* GPIO base number (can be negative) */
+	const int		gpio_base;
+	/* Called during startup */
+	void (*init)(void);
+	/* Called before finish */
+	void (*exit)(void);
+	/* Suspend callback */
+	void (*suspend)(int do_suspend);
+};
+
+#endif
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 0253c2022e53..7cf0b68bbe9e 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -193,8 +193,8 @@
 /* SH-SCI */
 #define PORT_SCIFB	93
 
-/* MAX3107 */
-#define PORT_MAX3107	94
+/* MAX310X */
+#define PORT_MAX310X	94
 
 /* High Speed UART for Medfield */
 #define PORT_MFD	95