i2c-sibyte: SWARM I2C board initialization

 The standard rtc-m41t80.c driver cannot be used with the SWARM as it is,
because the board does not provide setup information for the I2C core.  
As a result the bus and the address to probe for the M41T80 chip is not
known.

 Here is a set of changes that fix the problem:

1. swarm-i2c.c -- SWARM I2C board setup, currently for the M41T80 chip on 
   the bus #1 only (there is a MAX6654 temperature sensor on the bus #0 
   which may be added in the future if we have a driver for that chip).

2. The i2c-sibyte.c BCM1250A SMBus controller driver now registers its 
   buses as numbered so that board setup is correctly applied.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

arch/mips/sibyte/swarm/Makefile

 obj-y				:= setup.o rtc_xicor1241.o rtc_m41t81.o
 
+obj-$(CONFIG_I2C_BOARDINFO)	+= swarm-i2c.o
 obj-$(CONFIG_KGDB)		+= dbg_io.o

arch/mips/sibyte/swarm/swarm-i2c.c

+/*
+ *	arch/mips/sibyte/swarm/swarm-i2c.c
+ *
+ *	Broadcom BCM91250A (SWARM), etc. I2C platform setup.
+ *
+ *	Copyright (c) 2008  Maciej W. Rozycki
+ *
+ *	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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+
+static struct i2c_board_info swarm_i2c_info1[] __initdata = {
+	{
+		I2C_BOARD_INFO("m41t81", 0x68),
+	},
+};
+
+static int __init swarm_i2c_init(void)
+{
+	int err;
+
+	err = i2c_register_board_info(1, swarm_i2c_info1,
+				      ARRAY_SIZE(swarm_i2c_info1));
+	if (err < 0)
+		printk(KERN_ERR
+		       "swarm-i2c: cannot register board I2C devices\n");
+	return err;
+}
+
+arch_initcall(swarm_i2c_init);

drivers/i2c/busses/i2c-sibyte.c

@@ -143,7 +143,7 @@ static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
 	csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
 	csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
 
-	return i2c_add_adapter(i2c_adap);
+	return i2c_add_numbered_adapter(i2c_adap);
 }
 
 
@@ -159,6 +159,7 @@ static struct i2c_adapter sibyte_board_adapter[2] = {
 		.class		= I2C_CLASS_HWMON | I2C_CLASS_SPD,
 		.algo		= NULL,
 		.algo_data	= &sibyte_board_data[0],
+		.nr		= 0,
 		.name		= "SiByte SMBus 0",
 	},
 	{
@@ -167,6 +168,7 @@ static struct i2c_adapter sibyte_board_adapter[2] = {
 		.class		= I2C_CLASS_HWMON | I2C_CLASS_SPD,
 		.algo		= NULL,
 		.algo_data	= &sibyte_board_data[1],
+		.nr		= 1,
 		.name		= "SiByte SMBus 1",
 	},
 };