Resend to LKML Lee, This question is actually more about MFD. Can you point me to the possible causes for my failure below? Thanks. York On 04/16/2015 05:02 PM, York Sun wrote: > Julia and other experts, > > I am seeking for help on my device driver. > > I am working on a module driver for a FPGA design with open core I2C controller > memory-mapped to BAR2. I have searched up and down and found only one driver > (drivers/mfd/timberdale.c) with similar implementation. Following timberdale > driver, I am able to load the driver, but blocked by devm_ioremap_resource(). It > is always in conflict with my BAR2. I wonder if I did something wrong. Here is > the flow I tracked so far. (By the way, I am using an older kernel 3.12. The new > 4.0 kernel crashes when booting on my platform. I plan to move to newer kernel > later). > > mfd_add_devices() > | > |--mfd_add_device() > | > |--platform_device_add() > | > |--insert_resource() /* this passed */ > | | > | |--insert_resource_conflict() > | > |--device_add() > | > |--bus_probe_device() > | > |--devm_ioremap_resource() > | > |--devm_request_mem_region() > | > |--__request_region() /* this always conflicts */ > | > |--__request_resource() > > My driver is called RedStone DMA. Here is my debug output > >> root@p1022ds:~# insmod redstone_mfd.ko >> RedStone DMA 0002:05:00.0: pci_enable_device() successful >> RedStone DMA 0002:05:00.0: MSI-X init successful >> York kernel: Calling devm_ioremap_resource() >> York kernel kernel/resource.c __request_region 977: conflict=[??? 0xc00080000-0xc00087fff flags 0x80000000] >> ocores-i2c ocores-i2c: can't request region for resource [mem 0xc00086000-0xc0008601f] >> ocores-i2c: probe of ocores-i2c failed with error -16 >> RedStone DMA 0002:05:00.0: BAR[0] 0x0000000c00000000-0x0000000c0007ffff flags 0x0014220c, length 524288 >> RedStone DMA 0002:05:00.0: BAR[1] 0x0000000000000000-0x0000000000000000 flags 0x00000000, length 0 >> RedStone DMA 0002:05:00.0: BAR[2] 0x0000000c00080000-0x0000000c00087fff flags 0x00040200, length 32768 >> RedStone DMA 0002:05:00.0: BAR[3] 0x0000000000000000-0x0000000000000000 flags 0x00000000, length 0 >> RedStone DMA 0002:05:00.0: BAR[4] 0x0000000000000000-0x0000000000000000 flags 0x00000000, length 0 >> RedStone DMA 0002:05:00.0: BAR[5] 0x0000000000000000-0x0000000000000000 flags 0x00000000, length 0 >> RedStone DMA 0002:05:00.0: Version 1.4, built on 4-16-15, id 0 >> root@p1022ds:~# > > Can you shed some light on this? > > Thanks. > > York > -- 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
