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@xxxxxxxxxxxxxx>
---
I have renamed i2c-swarm.c to swarm-i2c.c for consistency with names
of other files under arch/mips/.
Please note this patch trivially depends on
patch-2.6.26-rc1-20080505-swarm-core-16 -- 2/6 of this set.
Maciej
patch-2.6.26-rc1-20080505-swarm-i2c-17
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/arch/mips/sibyte/swarm/Makefile linux-2.6.26-rc1-20080505/arch/mips/sibyte/swarm/Makefile
--- linux-2.6.26-rc1-20080505.macro/arch/mips/sibyte/swarm/Makefile 2008-05-06 01:18:21.000000000 +0000
+++ linux-2.6.26-rc1-20080505/arch/mips/sibyte/swarm/Makefile 2008-05-13 03:11:43.000000000 +0000
@@ -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 -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/arch/mips/sibyte/swarm/swarm-i2c.c linux-2.6.26-rc1-20080505/arch/mips/sibyte/swarm/swarm-i2c.c
--- linux-2.6.26-rc1-20080505.macro/arch/mips/sibyte/swarm/swarm-i2c.c 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.26-rc1-20080505/arch/mips/sibyte/swarm/swarm-i2c.c 2008-05-13 03:11:26.000000000 +0000
@@ -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
+ "i2c-swarm: cannot register board I2C devices\n");
+ return err;
+}
+
+arch_initcall(swarm_i2c_init);
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/drivers/i2c/busses/i2c-sibyte.c linux-2.6.26-rc1-20080505/drivers/i2c/busses/i2c-sibyte.c
--- linux-2.6.26-rc1-20080505.macro/drivers/i2c/busses/i2c-sibyte.c 2008-05-05 02:55:25.000000000 +0000
+++ linux-2.6.26-rc1-20080505/drivers/i2c/busses/i2c-sibyte.c 2008-05-11 01:21:45.000000000 +0000
@@ -143,7 +143,7 @@ int __init i2c_sibyte_add_bus(struct i2c
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_a
.class = I2C_CLASS_HWMON,
.algo = NULL,
.algo_data = &sibyte_board_data[0],
+ .nr = 0,
.name = "SiByte SMBus 0",
},
{
@@ -167,6 +168,7 @@ static struct i2c_adapter sibyte_board_a
.class = I2C_CLASS_HWMON,
.algo = NULL,
.algo_data = &sibyte_board_data[1],
+ .nr = 1,
.name = "SiByte SMBus 1",
},
};
