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>

2 files changed, 38 insertions, 0 deletions

diff --git a/arch/mips/sibyte/swarm/Makefile b/arch/mips/sibyte/swarm/Makefile
index 1775755a2619..255d692bfa18 100644
--- a/arch/mips/sibyte/swarm/Makefile
+++ b/arch/mips/sibyte/swarm/Makefile
@@ -1,3 +1,4 @@
 obj-y                           := setup.o rtc_xicor1241.o rtc_m41t81.o
 
+obj-$(CONFIG_I2C_BOARDINFO)     += swarm-i2c.o
 obj-$(CONFIG_KGDB)              += dbg_io.o
diff --git a/arch/mips/sibyte/swarm/swarm-i2c.c b/arch/mips/sibyte/swarm/swarm-i2c.c
new file mode 100644
index 000000000000..4282ac9d01d2
--- /dev/null
+++ b/arch/mips/sibyte/swarm/swarm-i2c.c
@@ -0,0 +1,37 @@
+/*
+ *      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);