Merge branch 'i2c-for-2630-v2' of git://aeryn.fluff.org.uk/bjdooks/linux

* 'i2c-for-2630-v2' of git://aeryn.fluff.org.uk/bjdooks/linux:
  i2c: imx: Make disable_delay a per-device variable
  i2c: xtensa s6000 i2c driver
  powerpc/85xx: i2c-mpc: use new I2C bindings for the Socates board
  i2c: i2c-mpc: make I2C bus speed configurable
  i2c: i2c-mpc: use dev based printout function
  i2c: i2c-mpc: various coding style fixes
  i2c: imx: Add missing request_mem_region in probe()
  i2c: i2c-s3c2410: Initialise Samsung I2C controller early
  i2c-s3c2410: Simplify bus frequency calculation
  i2c-s3c2410: sda_delay should be in ns, not clock ticks
  i2c: iMX/MXC support

arch/arm/mach-s3c2410/mach-bast.c

@@ -409,8 +409,7 @@ static struct platform_device bast_sio = {
 static struct s3c2410_platform_i2c __initdata bast_i2c_info = {
 	.flags		= 0,
 	.slave_addr	= 0x10,
-	.bus_freq	= 100*1000,
-	.max_freq	= 130*1000,
+	.frequency	= 100*1000,
 };
 
 /* Asix AX88796 10/100 ethernet controller */

arch/arm/mach-s3c2410/mach-n30.c

@@ -340,8 +340,7 @@ static struct platform_device *n35_devices[] __initdata = {
 static struct s3c2410_platform_i2c n30_i2ccfg = {
 	.flags		= 0,
 	.slave_addr	= 0x10,
-	.bus_freq	= 10*1000,
-	.max_freq	= 10*1000,
+	.frequency	= 10*1000,
 };
 
 /* Lots of hardcoded stuff, but it sets up the hardware in a useful

arch/arm/mach-s3c2412/mach-jive.c

@@ -453,8 +453,7 @@ static struct spi_board_info __initdata jive_spi_devs[] = {
 /* I2C bus and device configuration. */
 
 static struct s3c2410_platform_i2c jive_i2c_cfg __initdata = {
-	.max_freq	= 80 * 1000,
-	.bus_freq	= 50 * 1000,
+	.frequency	= 80 * 1000,
 	.flags		= S3C_IICFLG_FILTER,
 	.sda_delay	= 2,
 };

arch/arm/plat-mxc/include/mach/i2c.h

+/*
+ * i2c.h - i.MX I2C driver header file
+ *
+ * Copyright (c) 2008, Darius Augulis <augulis.darius@gmail.com>
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __ASM_ARCH_I2C_H_
+#define __ASM_ARCH_I2C_H_
+
+/**
+ * struct imxi2c_platform_data - structure of platform data for MXC I2C driver
+ * @init:	Initialise gpio's and other board specific things
+ * @exit:	Free everything initialised by @init
+ * @bitrate:	Bus speed measured in Hz
+ *
+ **/
+struct imxi2c_platform_data {
+	int (*init)(struct device *dev);
+	void (*exit)(struct device *dev);
+	int bitrate;
+};
+
+#endif /* __ASM_ARCH_I2C_H_ */

arch/arm/plat-s3c/dev-i2c0.c

 /* linux/arch/arm/plat-s3c/dev-i2c0.c
  *
- * Copyright 2008 Simtec Electronics
+ * Copyright 2008,2009 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  *	http://armlinux.simtec.co.uk/
  *
@@ -50,9 +50,8 @@ struct platform_device s3c_device_i2c0 = {
 static struct s3c2410_platform_i2c default_i2c_data0 __initdata = {
 	.flags		= 0,
 	.slave_addr	= 0x10,
-	.bus_freq	= 100*1000,
-	.max_freq	= 400*1000,
-	.sda_delay	= S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
+	.frequency	= 100*1000,
+	.sda_delay	= 100,
 };
 
 void __init s3c_i2c0_set_platdata(struct s3c2410_platform_i2c *pd)

arch/arm/plat-s3c/dev-i2c1.c

 /* linux/arch/arm/plat-s3c/dev-i2c1.c
  *
- * Copyright 2008 Simtec Electronics
+ * Copyright 2008,2009 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  *	http://armlinux.simtec.co.uk/
  *
@@ -47,9 +47,8 @@ static struct s3c2410_platform_i2c default_i2c_data1 __initdata = {
 	.flags		= 0,
 	.bus_num	= 1,
 	.slave_addr	= 0x10,
-	.bus_freq	= 100*1000,
-	.max_freq	= 400*1000,
-	.sda_delay	= S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
+	.frequency	= 100*1000,
+	.sda_delay	= 100,
 };
 
 void __init s3c_i2c1_set_platdata(struct s3c2410_platform_i2c *pd)

arch/arm/plat-s3c/include/plat/iic.h

-/* arch/arm/mach-s3c2410/include/mach/iic.h
+/* arch/arm/plat-s3c/include/plat/iic.h
  *
- * Copyright (c) 2004 Simtec Electronics
+ * Copyright 2004,2009 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  *
- * S3C2410 - I2C Controller platfrom_device info
+ * S3C - I2C Controller platform_device info
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -15,19 +15,24 @@
 
 #define S3C_IICFLG_FILTER	(1<<0)	/* enable s3c2440 filter */
 
-/* Notes:
- *	1) All frequencies are expressed in Hz
- *	2) A value of zero is `do not care`
-*/
-
+/**
+ *	struct s3c2410_platform_i2c - Platform data for s3c I2C.
+ *	@bus_num: The bus number to use (if possible).
+ *	@flags: Any flags for the I2C bus (E.g. S3C_IICFLK_FILTER).
+ *	@slave_addr: The I2C address for the slave device (if enabled).
+ *	@frequency: The desired frequency in Hz of the bus.  This is
+ *                  guaranteed to not be exceeded.  If the caller does
+ *                  not care, use zero and the driver will select a
+ *                  useful default.
+ *	@sda_delay: The delay (in ns) applied to SDA edges.
+ *	@cfg_gpio: A callback to configure the pins for I2C operation.
+ */
 struct s3c2410_platform_i2c {
-	int		bus_num;	/* bus number to use */
+	int		bus_num;
 	unsigned int	flags;
-	unsigned int	slave_addr;	/* slave address for controller */
-	unsigned long	bus_freq;	/* standard bus frequency */
-	unsigned long	max_freq;	/* max frequency for the bus */
-	unsigned long	min_freq;	/* min frequency for the bus */
-	unsigned int	sda_delay;	/* pclks (s3c2440 only) */
+	unsigned int	slave_addr;
+	unsigned long	frequency;
+	unsigned int	sda_delay;
 
 	void	(*cfg_gpio)(struct platform_device *dev);
 };

arch/powerpc/boot/dts/socrates.dts

@@ -79,11 +79,11 @@
 			#address-cells = <1>;
 			#size-cells = <0>;
 			cell-index = <0>;
-			compatible = "fsl-i2c";
+			compatible = "fsl,mpc8544-i2c", "fsl-i2c";
 			reg = <0x3000 0x100>;
 			interrupts = <43 2>;
 			interrupt-parent = <&mpic>;
-			dfsrr;
+			fsl,preserve-clocking;
 
 			dtt@28 {
 				compatible = "winbond,w83782d";
@@ -111,11 +111,11 @@
 			#address-cells = <1>;
 			#size-cells = <0>;
 			cell-index = <1>;
-			compatible = "fsl-i2c";
+			compatible = "fsl,mpc8544-i2c", "fsl-i2c";
 			reg = <0x3100 0x100>;
 			interrupts = <43 2>;
 			interrupt-parent = <&mpic>;
-			dfsrr;
+			fsl,preserve-clocking;
 		};
 
 		enet0: ethernet@24000 {

drivers/i2c/busses/Kconfig

@@ -356,6 +356,16 @@ config I2C_IBM_IIC
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-ibm_iic.
 
+config I2C_IMX
+	tristate "IMX I2C interface"
+	depends on ARCH_MXC
+	help
+	  Say Y here if you want to use the IIC bus controller on
+	  the Freescale i.MX/MXC processors.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-imx.
+
 config I2C_IOP3XX
 	tristate "Intel IOPx3xx and IXP4xx on-chip I2C interface"
 	depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX
@@ -462,6 +472,16 @@ config I2C_S3C2410
 	  Say Y here to include support for I2C controller in the
 	  Samsung S3C2410 based System-on-Chip devices.
 
+config I2C_S6000
+	tristate "S6000 I2C support"
+	depends on XTENSA_VARIANT_S6000
+	help
+	  This driver supports the on chip I2C device on the
+	  S6000 xtensa processor family.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called i2c-s6000.
+
 config I2C_SH7760
 	tristate "Renesas SH7760 I2C Controller"
 	depends on CPU_SUBTYPE_SH7760

drivers/i2c/busses/Makefile

@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_DAVINCI)	+= i2c-davinci.o
 obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o
 obj-$(CONFIG_I2C_HIGHLANDER)	+= i2c-highlander.o
 obj-$(CONFIG_I2C_IBM_IIC)	+= i2c-ibm_iic.o
+obj-$(CONFIG_I2C_IMX)		+= i2c-imx.o
 obj-$(CONFIG_I2C_IOP3XX)	+= i2c-iop3xx.o
 obj-$(CONFIG_I2C_IXP2000)	+= i2c-ixp2000.o
 obj-$(CONFIG_I2C_MPC)		+= i2c-mpc.o
@@ -43,6 +44,7 @@ obj-$(CONFIG_I2C_PASEMI)	+= i2c-pasemi.o
 obj-$(CONFIG_I2C_PNX)		+= i2c-pnx.o
 obj-$(CONFIG_I2C_PXA)		+= i2c-pxa.o
 obj-$(CONFIG_I2C_S3C2410)	+= i2c-s3c2410.o
+obj-$(CONFIG_I2C_S6000)		+= i2c-s6000.o
 obj-$(CONFIG_I2C_SH7760)	+= i2c-sh7760.o
 obj-$(CONFIG_I2C_SH_MOBILE)	+= i2c-sh_mobile.o
 obj-$(CONFIG_I2C_SIMTEC)	+= i2c-simtec.o

drivers/i2c/busses/i2c-s3c2410.c

 /* linux/drivers/i2c/busses/i2c-s3c2410.c
  *
- * Copyright (C) 2004,2005 Simtec Electronics
+ * Copyright (C) 2004,2005,2009 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  *
  * S3C2410 I2C Controller
@@ -590,18 +590,6 @@ static int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted,
 	return clkin / (calc_divs * calc_div1);
 }
 
-/* freq_acceptable
- *
- * test wether a frequency is within the acceptable range of error
-*/
-
-static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
-{
-	int diff = freq - wanted;
-
-	return diff >= -2 && diff <= 2;
-}
-
 /* s3c24xx_i2c_clockrate
  *
  * work out a divisor for the user requested frequency setting,
@@ -614,44 +602,28 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 	struct s3c2410_platform_i2c *pdata = i2c->dev->platform_data;
 	unsigned long clkin = clk_get_rate(i2c->clk);
 	unsigned int divs, div1;
+	unsigned long target_frequency;
 	u32 iiccon;
 	int freq;
-	int start, end;
 
 	i2c->clkrate = clkin;
 	clkin /= 1000;		/* clkin now in KHz */
 
-	dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n",
-		 pdata, pdata->bus_freq, pdata->min_freq, pdata->max_freq);
-
-	if (pdata->bus_freq != 0) {
-		freq = s3c24xx_i2c_calcdivisor(clkin, pdata->bus_freq/1000,
-					       &div1, &divs);
-		if (freq_acceptable(freq, pdata->bus_freq/1000))
-			goto found;
-	}
-
-	/* ok, we may have to search for something suitable... */
+	dev_dbg(i2c->dev, "pdata desired frequency %lu\n", pdata->frequency);
 
-	start = (pdata->max_freq == 0) ? pdata->bus_freq : pdata->max_freq;
-	end = pdata->min_freq;
+	target_frequency = pdata->frequency ? pdata->frequency : 100000;
 
-	start /= 1000;
-	end /= 1000;
+	target_frequency /= 1000; /* Target frequency now in KHz */
 
-	/* search loop... */
+	freq = s3c24xx_i2c_calcdivisor(clkin, target_frequency, &div1, &divs);
 
-	for (; start > end; start--) {
-		freq = s3c24xx_i2c_calcdivisor(clkin, start, &div1, &divs);
-		if (freq_acceptable(freq, start))
-			goto found;
+	if (freq > target_frequency) {
+		dev_err(i2c->dev,
+			"Unable to achieve desired frequency %luKHz."	\
+			" Lowest achievable %dKHz\n", target_frequency, freq);
+		return -EINVAL;
 	}
 
-	/* cannot find frequency spec */
-
-	return -EINVAL;
-
- found:
 	*got = freq;
 
 	iiccon = readl(i2c->regs + S3C2410_IICCON);
@@ -663,6 +635,23 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 
 	writel(iiccon, i2c->regs + S3C2410_IICCON);
 
+	if (s3c24xx_i2c_is2440(i2c)) {
+		unsigned long sda_delay;
+
+		if (pdata->sda_delay) {
+			sda_delay = (freq / 1000) * pdata->sda_delay;
+			sda_delay /= 1000000;
+			sda_delay = DIV_ROUND_UP(sda_delay, 5);
+			if (sda_delay > 3)
+				sda_delay = 3;
+			sda_delay |= S3C2410_IICLC_FILTER_ON;
+		} else
+			sda_delay = 0;
+
+		dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay);
+		writel(sda_delay, i2c->regs + S3C2440_IICLC);
+	}
+
 	return 0;
 }
 
@@ -769,11 +758,8 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
 	/* check for s3c2440 i2c controller  */
 
-	if (s3c24xx_i2c_is2440(i2c)) {
-		dev_dbg(i2c->dev, "S3C2440_IICLC=%08x\n", pdata->sda_delay);
-
-		writel(pdata->sda_delay, i2c->regs + S3C2440_IICLC);
-	}
+	if (s3c24xx_i2c_is2440(i2c))
+		writel(0x0, i2c->regs + S3C2440_IICLC);
 
 	return 0;
 }
@@ -1018,14 +1004,13 @@ static int __init i2c_adap_s3c_init(void)
 
 	return ret;
 }
+subsys_initcall(i2c_adap_s3c_init);
 
 static void __exit i2c_adap_s3c_exit(void)
 {
 	platform_driver_unregister(&s3c2410_i2c_driver);
 	platform_driver_unregister(&s3c2440_i2c_driver);
 }
-
-module_init(i2c_adap_s3c_init);
 module_exit(i2c_adap_s3c_exit);
 
 MODULE_DESCRIPTION("S3C24XX I2C Bus driver");

drivers/i2c/busses/i2c-s6000.h

+/*
+ * drivers/i2c/busses/i2c-s6000.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Emlix GmbH <info@emlix.com>
+ * Author:	Oskar Schirmer <os@emlix.com>
+ */
+
+#ifndef __DRIVERS_I2C_BUSSES_I2C_S6000_H
+#define __DRIVERS_I2C_BUSSES_I2C_S6000_H
+
+#define S6_I2C_CON		0x000
+#define S6_I2C_CON_MASTER		0
+#define S6_I2C_CON_SPEED		1
+#define S6_I2C_CON_SPEED_NORMAL			1
+#define S6_I2C_CON_SPEED_FAST			2
+#define S6_I2C_CON_SPEED_MASK			3
+#define S6_I2C_CON_10BITSLAVE		3
+#define S6_I2C_CON_10BITMASTER		4
+#define S6_I2C_CON_RESTARTENA		5
+#define S6_I2C_CON_SLAVEDISABLE		6
+#define S6_I2C_TAR		0x004
+#define S6_I2C_TAR_GCORSTART		10
+#define S6_I2C_TAR_SPECIAL		11
+#define S6_I2C_SAR		0x008
+#define S6_I2C_HSMADDR		0x00C
+#define S6_I2C_DATACMD		0x010
+#define S6_I2C_DATACMD_READ		8
+#define S6_I2C_SSHCNT		0x014
+#define S6_I2C_SSLCNT		0x018
+#define S6_I2C_FSHCNT		0x01C
+#define S6_I2C_FSLCNT		0x020
+#define S6_I2C_INTRSTAT		0x02C
+#define S6_I2C_INTRMASK		0x030
+#define S6_I2C_RAWINTR		0x034
+#define S6_I2C_INTR_RXUNDER		0
+#define S6_I2C_INTR_RXOVER		1
+#define S6_I2C_INTR_RXFULL		2
+#define S6_I2C_INTR_TXOVER		3
+#define S6_I2C_INTR_TXEMPTY		4
+#define S6_I2C_INTR_RDREQ		5
+#define S6_I2C_INTR_TXABRT		6
+#define S6_I2C_INTR_RXDONE		7
+#define S6_I2C_INTR_ACTIVITY		8
+#define S6_I2C_INTR_STOPDET		9
+#define S6_I2C_INTR_STARTDET		10
+#define S6_I2C_INTR_GENCALL		11
+#define S6_I2C_RXTL		0x038
+#define S6_I2C_TXTL		0x03C
+#define S6_I2C_CLRINTR		0x040
+#define S6_I2C_CLRRXUNDER	0x044
+#define S6_I2C_CLRRXOVER	0x048
+#define S6_I2C_CLRTXOVER	0x04C
+#define S6_I2C_CLRRDREQ		0x050
+#define S6_I2C_CLRTXABRT	0x054
+#define S6_I2C_CLRRXDONE	0x058
+#define S6_I2C_CLRACTIVITY	0x05C
+#define S6_I2C_CLRSTOPDET	0x060
+#define S6_I2C_CLRSTARTDET	0x064
+#define S6_I2C_CLRGENCALL	0x068
+#define S6_I2C_ENABLE		0x06C
+#define S6_I2C_STATUS		0x070
+#define S6_I2C_STATUS_ACTIVITY		0
+#define S6_I2C_STATUS_TFNF		1
+#define S6_I2C_STATUS_TFE		2
+#define S6_I2C_STATUS_RFNE		3
+#define S6_I2C_STATUS_RFF		4
+#define S6_I2C_TXFLR		0x074
+#define S6_I2C_RXFLR		0x078
+#define S6_I2C_SRESET		0x07C
+#define S6_I2C_SRESET_IC_SRST		0
+#define S6_I2C_SRESET_IC_MASTER_SRST	1
+#define S6_I2C_SRESET_IC_SLAVE_SRST	2
+#define S6_I2C_TXABRTSOURCE	0x080
+
+#endif

include/linux/i2c/s6000.h

+#ifndef __LINUX_I2C_S6000_H
+#define __LINUX_I2C_S6000_H
+
+struct s6_i2c_platform_data {
+	const char *clock; /* the clock to use */
+	int bus_num; /* the bus number to register */
+};
+
+#endif
+