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i2c-sibyte: SWARM I2C board initialization

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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>
This commit is contained in:
Maciej W. Rozycki 2008-07-14 22:38:33 +02:00 committed by Jean Delvare
parent cf898dc5e9
commit 392a0408fd
3 changed files with 41 additions and 1 deletions
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1
arch/mips/sibyte/swarm/Makefile
View file

@ -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

37
arch/mips/sibyte/swarm/swarm-i2c.c Normal file
View file

@ -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);

4
drivers/i2c/busses/i2c-sibyte.c
View file

@ -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",
},
};