Shubhrajyoti <shubhrajyoti@xxxxxx> writes: > On Wednesday 03 August 2011 04:53 AM, Kevin Hilman wrote: >> Shubhrajyoti D<shubhrajyoti@xxxxxx> writes: >> >>> Under some error conditions the i2c driver may do a reset. >> ^ ^ >> minor: extra whitespace >> >>> Adding a reset field and support in the platform. >> s/platform/device-specific code/ >> > Yes will fix these. >>> Signed-off-by: Shubhrajyoti D<shubhrajyoti@xxxxxx> >> That being said, omap_device_shutdown() should already do a clean >> shutdown + reset for you, and i2c-omap.h already has a pointer for >> ->device_shutdown() so a new device_reset() should not be needed. >> >> IOW, simply adding pdata->device_shutdown = omap_device_shutdown() >> should work. > i2C has a special reset sequence ie Disable -> reset -> enable -> Poll > on reset done. > This function is implemented in omap_i2c_reset. The > > omap_hwmod_reset calls -> _reset > > which calls ocp_softrest or custom reset if it is present.The latter > is true for I2C. > > However I see that > > omap_device_shutdown -> _assert_hardreset However for I2c there doesnt seem to be a HW reset line. > > > Am I missing something? > No, my fault. I thought omap_device_shutdown() also did soft reset, but I see that's not the case. You can ignore my comments about using omap_device_shutdown. Kevin -- 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
