Hi, We use the i2c-pnx.c driver on our device (NXP LPC3xxx devices), but have had some issues with compilation and general use. I hope these changes can be of use and can get back into the mainline. I'm happy to test any changes for the driver here on our boards. The i2c-pnx.c file doesn't seem to compile (even with the pnx4008 platform selected). It looks like several important header files are not included in the driver (mach/i2c.h and asm/io.h). We have another board that uses this same IP, but with a slight reordering of the registers, so the i2c.h file in the mach area (which defines register offsets) is important where it is now. For systems with a tick rate of 100Hz, the I2C_PNX_TIMEOUT value of 10mS give only 1 jiffie before the transfer times out. We've noticed on some transfers that the jiffie may tick immediately after the expire count is set, causing the transfer in progress to timeout before 10mS is up. A small test to make sure jiffies was at least 2 fixed this. We have multiple I2C busses on our system. The bus id value in the platform definition area (in the arm/mach- area) wasn't being correctly matched to the specific I2C bus. This would cause some devices to not match to the correct I2C bus. The 'buf' field in the I2C transfer descriptor was typed as a char. In the I2C driver, data values in the buffer pointer to by buf were being sign extended into the stop and start bit positions (8 and 9). For I2C transfers where a data byte had bit 7 set, both the start and stop bits were also getting set in the hardware. The complete patch is listed below: diff -Naur -X linux-2.6.32-rc6-ref/Documentation/dontdiff linux-2.6.32-rc6-ref/drivers/i2c/busses/i2c-pnx.c linux-2.6.32-rc6/drivers/i2c/busses/i2c-pnx.c --- linux-2.6.32-rc6-ref/drivers/i2c/busses/i2c-pnx.c 2009-11-03 11:37:49.000000000 -0800 +++ linux-2.6.32-rc6/drivers/i2c/busses/i2c-pnx.c 2009-11-10 14:09:11.000000000 -0800 @@ -20,8 +20,10 @@ #include <linux/platform_device.h> #include <linux/i2c-pnx.h> #include <mach/hardware.h> +#include <mach/i2c.h> #include <asm/irq.h> #include <asm/uaccess.h> +#include <asm/io.h> #define I2C_PNX_TIMEOUT 10 /* msec */ #define I2C_PNX_SPEED_KHZ 100 @@ -54,6 +56,9 @@ struct timer_list *timer = &data->mif.timer; int expires = I2C_PNX_TIMEOUT / (1000 / HZ); + if (expires <= 1) + expires = 2; + del_timer_sync(timer); dev_dbg(&adap->dev, "Timer armed at %lu plus %u jiffies.\n", @@ -633,7 +638,8 @@ /* Register this adapter with the I2C subsystem */ i2c_pnx->adapter->dev.parent = &pdev->dev; - ret = i2c_add_adapter(i2c_pnx->adapter); + i2c_pnx->adapter->nr = pdev->id; + ret = i2c_add_numbered_adapter(i2c_pnx->adapter); if (ret < 0) { dev_err(&pdev->dev, "I2C: Failed to add bus\n"); goto out_irq; diff -Naur -X linux-2.6.32-rc6-ref/Documentation/dontdiff linux-2.6.32-rc6-ref/include/linux/i2c-pnx.h linux-2.6.32-rc6/include/linux/i2c-pnx.h --- linux-2.6.32-rc6-ref/include/linux/i2c-pnx.h 2009-11-03 11:37:49.000000000 -0800 +++ linux-2.6.32-rc6/include/linux/i2c-pnx.h 2009-11-10 14:16:55.000000000 -0800 @@ -21,7 +21,7 @@ int mode; /* Interface mode */ struct completion complete; /* I/O completion */ struct timer_list timer; /* Timeout */ - char * buf; /* Data buffer */ + u8 * buf; /* Data buffer */ int len; /* Length of data buffer */ }; thanks, Kevin Wells NXP Semiconductors -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html