Enable frequency scaling

Normally, when the cpufreq files fail to show in the filesystem, this is due to some failure in the initialization of the cpufreq driver or regulator layer drivers.

What board are you using?  If this is a TI board, which revision?  Also, which version of SDK are you using?  Do you see any failure messages in the boot log?  Feel free to post your boot log if you'd like me to review it.

Hello Mr. Guyotte,

sorry for my delayed reply.

We are using an custom board, on which runs a Android Yelly Bean 4.2.2 and Dev Kit 4.1.1.

I couldn't find any Error in the Boot Log.

DMesg:

<5>[    0.000000] Linux version 3.2.0 (jenkins@virtual-jenkins) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #1 PREEMPT Tue Nov 5 13:15:40 CET 2013
<4>[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d
<4>[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
<4>[    0.000000] Machine: am335xcsm
<4>[    0.000000] Memory policy: ECC disabled, Data cache writeback
<7>[    0.000000] On node 0 totalpages: 65536
<7>[    0.000000] free_area_init_node: node 0, pgdat c05e0820, node_mem_map c0707000
<7>[    0.000000]   Normal zone: 512 pages used for memmap
<7>[    0.000000]   Normal zone: 0 pages reserved
<7>[    0.000000]   Normal zone: 65024 pages, LIFO batch:15
<6>[    0.000000] AM335X ES1.0 (sgx neon )
<7>[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
<7>[    0.000000] pcpu-alloc: [0] 0
<4>[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
<5>[    0.000000] Kernel command line: init=/init console=ttyO2,115200n8 mem=256M lpj=3590144 quiet
<6>[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
<6>[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
<6>[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
<6>[    0.000000] Memory: 256MB = 256MB total
<5>[    0.000000] Memory: 252480k/252480k available, 9664k reserved, 0K highmem
<5>[    0.000000] Virtual kernel memory layout:
<5>[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
<5>[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
<5>[    0.000000]     vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)
<5>[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
<5>[    0.000000]     modules : 0xbf000000 - 0xc0000000   (  16 MB)
<5>[    0.000000]       .text : 0xc0008000 - 0xc0567000   (5500 kB)
<5>[    0.000000]       .init : 0xc0567000 - 0xc0599000   ( 200 kB)
<5>[    0.000000]       .data : 0xc059a000 - 0xc05e1000   ( 284 kB)
<5>[    0.000000]        .bss : 0xc05e1024 - 0xc0706740   (1174 kB)
<6>[    0.000000] NR_IRQS:396
<6>[    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
<6>[    0.000000] Total of 128 interrupts on 1 active controller
<4>[    0.000000] read boot clock
<4>[    0.000000] timekeeping_init
<6>[    0.000000] OMAP clockevent source: GPTIMER2 at 24000000 Hz
<4>[    0.000000] omap_dm_timer_switch_src: Switching to HW default clocksource(sys_clkin_ck) for timer1, this may impact timekeeping in low power state
<6>[    0.000000] OMAP clocksource: GPTIMER1 at 24000000 Hz
<6>[    0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
<6>[    0.000000] Console: colour dummy device 80x30
<6>[    0.000212] Calibrating delay loop (skipped) preset value.. 718.02 BogoMIPS (lpj=3590144)
<6>[    0.000233] pid_max: default: 32768 minimum: 301
<6>[    0.000350] Security Framework initialized
<6>[    0.000416] Mount-cache hash table entries: 512
<6>[    0.000819] CPU: Testing write buffer coherency: ok
<4>[    0.021259] omap_hwmod: pruss: failed to hardreset
<6>[    0.021898] print_constraints: dummy:
<6>[    0.022124] NET: Registered protocol family 16
<6>[    0.023117] OMAP GPIO hardware version 0.1
<6>[    0.024028] omap_mux_init: Add partition: #1: core, flags: 0
<4>[    0.025411]  omap2_mcspi.1: alias fck already exists
<4>[    0.025506]  omap2_mcspi.2: alias fck already exists
<4>[    0.025639]  edma.0: alias fck already exists
<4>[    0.025658]  edma.0: alias fck already exists
<4>[    0.025676]  edma.0: alias fck already exists
<6>[    0.032242] bio: create slab <bio-0> at 0
<7>[    0.033097] omap2_mcspi omap2_mcspi.1: registered master spi1
<7>[    0.033262] omap2_mcspi omap2_mcspi.2: registered master spi2
<6>[    0.033528] usbcore: registered new interface driver usbfs
<6>[    0.033597] usbcore: registered new interface driver hub
<6>[    0.033729] usbcore: registered new device driver usb
<6>[    0.033856] musb-ti81xx musb-ti81xx: musb0, board_mode=0x13, plat_mode=0x3
<6>[    0.033985] musb-ti81xx musb-ti81xx: musb1, board_mode=0x13, plat_mode=0x1
<6>[    0.035062] Bluetooth: Core ver 2.16
<6>[    0.035105] NET: Registered protocol family 31
<6>[    0.035115] Bluetooth: HCI device and connection manager initialized
<6>[    0.035130] Bluetooth: HCI socket layer initialized
<6>[    0.035295] Switching to clocksource gp timer
<6>[    0.041699] musb-hdrc: version 6.0, ?dma?, otg (peripheral+host)
<6>[    0.041868] musb-hdrc musb-hdrc.0: dma type: pio
<6>[    0.042036] MUSB0 controller's USBSS revision = 4ea20800
<7>[    0.042072] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
<7>[    0.042091] musb-hdrc: MHDRC RTL version 2.0
<7>[    0.042102] musb-hdrc: setup fifo_mode 4
<7>[    0.042130] musb-hdrc: 28/31 max ep, 16384/16384 memory
<7>[    0.042143] musb-hdrc.0: bulk split disabled
<7>[    0.042151] musb-hdrc.0: bulk combine disabled
<6>[    0.042460] musb-hdrc musb-hdrc.0: USB OTG mode controller at d083c000 using PIO, IRQ 18
<6>[    0.042683] musb-hdrc musb-hdrc.1: dma type: pio
<6>[    0.042805] MUSB1 controller's USBSS revision = 4ea20800
<7>[    0.042831] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
<7>[    0.042848] musb-hdrc: MHDRC RTL version 2.0
<7>[    0.042858] musb-hdrc: setup fifo_mode 4
<7>[    0.042882] musb-hdrc: 28/31 max ep, 16384/16384 memory
<7>[    0.042893] musb-hdrc.1: bulk split disabled
<7>[    0.042901] musb-hdrc.1: bulk combine disabled
<6>[    0.042971] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
<6>[    0.042989] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1
<6>[    0.043124] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
<6>[    0.043139] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
<6>[    0.043152] usb usb1: Product: MUSB HDRC host driver
<6>[    0.043162] usb usb1: Manufacturer: Linux 3.2.0 musb-hcd
<6>[    0.043172] usb usb1: SerialNumber: musb-hdrc.1
<6>[    0.043611] hub 1-0:1.0: USB hub found
<6>[    0.043637] hub 1-0:1.0: 1 port detected
<6>[    0.043861] musb-hdrc musb-hdrc.1: USB Host mode controller at d083e800 using PIO, IRQ 19
<6>[    0.044213] NET: Registered protocol family 2
<6>[    0.044421] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
<6>[    0.044815] TCP established hash table entries: 8192 (order: 4, 65536 bytes)
<6>[    0.044973] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
<6>[    0.045066] TCP: Hash tables configured (established 8192 bind 8192)
<6>[    0.045079] TCP reno registered
<6>[    0.045090] UDP hash table entries: 256 (order: 0, 4096 bytes)
<6>[    0.045113] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
<6>[    0.045393] NET: Registered protocol family 1
<6>[    0.045683] RPC: Registered named UNIX socket transport module.
<6>[    0.045698] RPC: Registered udp transport module.
<6>[    0.045706] RPC: Registered tcp transport module.
<6>[    0.045715] RPC: Registered tcp NFSv4.1 backchannel transport module.
<6>[    0.045995] Trying to unpack rootfs image as initramfs...
<6>[    0.061649] Freeing initrd memory: 176K
<4>[    0.061672] NetWinder Floating Point Emulator V0.97 (double precision)
<4>[    0.062972]  omap_hsmmc.1: alias fck already exists
<4>[    0.063240]  da8xx_lcdc.0: alias fck already exists
<7>[    0.063704] spi spi1.0: setup: speed 24000000, sample leading edge, clk normal
<7>[    0.063748] spi spi1.0: setup mode 0, 8 bits/w, 24000000 Hz max --> 0
<7>[    0.063843] omap2_mcspi omap2_mcspi.1: registered child spi1.0
<6>[    0.072858] ashmem: initialized
<6>[    0.073790] fuse init (API version 7.17)
<6>[    0.074003] msgmni has been set to 493
<6>[    0.075123] io scheduler noop registered
<6>[    0.075137] io scheduler deadline registered
<6>[    0.075215] io scheduler cfq registered (default)
<6>[    0.075716] da8xx_lcdc da8xx_lcdc.0: GLCD: Found Sharp_LCD035Q3DG01 panel
<6>[    0.087816] omap_uart.0: ttyO0 at MMIO 0x44e09000 (irq = 72) is a OMAP UART0
<6>[    0.088174] omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1
<6>[    0.088448] omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2
<6>[    0.088633] console [ttyO2] enabled
<6>[    0.088943] omap_uart.3: ttyO3 at MMIO 0x481a6000 (irq = 44) is a OMAP UART3
<6>[    0.089232] omap_uart.4: ttyO4 at MMIO 0x481a8000 (irq = 45) is a OMAP UART4
<6>[    0.089507] omap_uart.5: ttyO5 at MMIO 0x481aa000 (irq = 46) is a OMAP UART5
<6>[    0.089879] [drm] Initialized drm 1.1.0 20060810
<6>[    0.094729] brd: module loaded
<6>[    0.097604] loop: module loaded
<6>[    0.098257] usbcore: registered new interface driver asix
<6>[    0.098343] usbcore: registered new interface driver cdc_ether
<6>[    0.098407] usbcore: registered new interface driver cdc_eem
<6>[    0.098467] usbcore: registered new interface driver dm9601
<6>[    0.098521] usbcore: registered new interface driver cdc_subset
<6>[    0.098578] cdc_ncm: 04-Aug-2011
<6>[    0.098632] usbcore: registered new interface driver cdc_ncm
<6>[    0.098798] usbcore: registered new interface driver usbserial
<6>[    0.098851] USB Serial support registered for generic
<6>[    0.098921] usbcore: registered new interface driver usbserial_generic
<6>[    0.098932] usbserial: USB Serial Driver core
<6>[    0.098977] USB Serial support registered for GSM modem (1-port)
<6>[    0.099133] usbcore: registered new interface driver option
<6>[    0.099143] option: v0.7.2:USB Driver for GSM modems
<6>[    0.099347] mousedev: PS/2 mouse device common for all mice
<6>[    0.100001] using rtc device, am33xx-rtc, for alarms
<6>[    0.100053] omap_rtc am33xx-rtc: rtc core: registered am33xx-rtc as rtc0
<6>[    0.100122] i2c /dev entries driver
<6>[    0.100842] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
<6>[    0.101114] device-mapper: uevent: version 1.0.3
<6>[    0.101270] device-mapper: ioctl: 4.22.0-ioctl (2011-10-19) initialised: dm-devel@redhat.com
<6>[    0.101288] Bluetooth: HCI UART driver ver 2.2
<6>[    0.101301] Bluetooth: HCI H4 protocol initialized
<4>[    0.101387] _regulator_get: deviceless supply vdd_mpu not found, using dummy regulator
<6>[    0.101520] cpuidle: using governor ladder
<6>[    0.101671] cpuidle: using governor menu
<6>[    0.103725] logger: created 256K log 'log_main'
<6>[    0.103818] logger: created 256K log 'log_events'
<6>[    0.103914] logger: created 256K log 'log_radio'
<6>[    0.104003] logger: created 256K log 'log_system'
<6>[    0.104715] tiadc tiadc: attached adc driver
<6>[    0.104876] Netfilter messages via NETLINK v0.30.
<6>[    0.105000] nf_conntrack version 0.5.0 (3947 buckets, 15788 max)
<6>[    0.105593] ctnetlink v0.93: registering with nfnetlink.
<6>[    0.105685] NF_TPROXY: Transparent proxy support initialized, version 4.1.0
<6>[    0.105696] NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.
<6>[    0.106038] xt_time: kernel timezone is -0000
<6>[    0.106274] ip_tables: (C) 2000-2006 Netfilter Core Team
<6>[    0.106486] arp_tables: (C) 2002 David S. Miller
<6>[    0.106563] TCP cubic registered
<6>[    0.106727] NET: Registered protocol family 10
<6>[    0.107547] Mobile IPv6
<6>[    0.107597] ip6_tables: (C) 2000-2006 Netfilter Core Team
<6>[    0.107799] IPv6 over IPv4 tunneling driver
<6>[    0.108418] NET: Registered protocol family 17
<6>[    0.108459] NET: Registered protocol family 15
<6>[    0.108896] rfkill_gpio rfkill_gpio: bluetooth_rfkill device registered.
<5>[    0.108956] Registering the dns_resolver key type
<6>[    0.109047] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
<6>[    0.109071] ThumbEE CPU extension supported.
<4>[    0.109333] mux: Failed to setup hwmod io irq -22
<6>[    0.109348] Power Management for AM33XX family
<6>[    0.109553] Trying to load am335x-pm-firmware.bin (60 secs timeout)
<6>[    0.109686] Copied the M3 firmware to UMEM
<6>[    0.109783] Cortex M3 Firmware Version = 0x181
<6>[    0.109796] clock: disabling unused clocks to save power
<6>[    0.110414] omap_rtc am33xx-rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
<6>[    0.111096] Freeing init memory: 200K
<4>[    0.115819] init (1): /proc/1/oom_adj is deprecated, please use /proc/1/oom_score_adj instead.
<3>[    0.178347] init: cannot open '/initlogo.rle'
<3>[    0.187732] fs_mgr: Trying to open /fstab.am335xcsm
<6>[    0.207302] mmc0: new high speed MMC card at address 0001
<6>[    0.207874] mmcblk0: mmc0:0001 MMC08G 7.32 GiB
<6>[    0.208018] mmcblk0boot0: mmc0:0001 MMC08G partition 1 2.00 MiB
<6>[    0.208138] mmcblk0boot1: mmc0:0001 MMC08G partition 2 2.00 MiB
<4>[    0.213411] Alternate GPT is invalid, using primary GPT.
<6>[    0.213679]  mmcblk0: p1 p2 p3 p4 p5 p6 p7 p8 p9
<6>[    0.219323]  mmcblk0boot1: unknown partition table
<6>[    0.221022]  mmcblk0boot0: unknown partition table
<6>[    0.247260] EXT4-fs (mmcblk0p6): recovery complete
<6>[    0.247298] EXT4-fs (mmcblk0p6): mounted filesystem with ordered data mode. Opts: (null)
<6>[    0.296256] EXT4-fs (mmcblk0p7): recovery complete
<6>[    0.298802] EXT4-fs (mmcblk0p7): mounted filesystem with ordered data mode. Opts: nomblk_io_submit,errors=panic
<6>[    0.608490] EXT4-fs (mmcblk0p8): recovery complete
<6>[    0.611075] EXT4-fs (mmcblk0p8): mounted filesystem with ordered data mode. Opts: nomblk_io_submit,errors=panic
<6>[    0.635779]  gadget: Mass Storage Function, version: 2009/09/11
<6>[    0.635802]  gadget: Number of LUNs=1
<6>[    0.635814]  lun0: LUN: removable file: (no medium)
<6>[    0.636038]  gadget: android_usb ready
<6>[    0.636070] musb-hdrc musb-hdrc.0: MUSB HDRC host driver
<6>[    0.636091] musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 2
<6>[    0.636215] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
<6>[    0.636229] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
<6>[    0.636243] usb usb2: Product: MUSB HDRC host driver
<6>[    0.636253] usb usb2: Manufacturer: Linux 3.2.0 musb-hcd
<6>[    0.636264] usb usb2: SerialNumber: musb-hdrc.0
<6>[    0.636746] hub 2-0:1.0: USB hub found
<6>[    0.636775] hub 2-0:1.0: 1 port detected
<3>[    0.683993] init: cannot find '/system/etc/install-recovery.sh', disabling 'flash_recovery'
<3>[    0.712076] android_usb: already disabled
<3>[    0.723506] android_usb: already disabled
<3>[    0.728610] android_usb: already disabled
<6>[    0.733577] adb_bind_config
<6>[    0.734413] adb_bind_config
<6>[    0.741797] adb_open
<4>[    0.995033] Disabling lock debugging due to kernel taint
<6>[    1.061186] acc_ctrlrequest 80.06 v0100 i0000 l64
<6>[    1.061903] android_work: sent uevent USB_STATE=CONNECTED
<6>[    1.064285] USB Serial support registered for GobiSerial
<6>[    1.064421] usbcore: registered new interface driver GobiSerial
<6>[    1.064432] GobiSerial: 2011-07-29-1026
<6>[    1.066084] android_work: sent uevent USB_STATE=DISCONNECTED
<6>[    1.311186] acc_ctrlrequest 80.06 v0100 i0000 l18
<6>[    1.311367] android_work: sent uevent USB_STATE=CONNECTED
<6>[    1.311412] acc_ctrlrequest 80.06 v0200 i0000 l9
<6>[    1.311714] acc_ctrlrequest 80.06 v0300 i0000 l255
<6>[    1.311912] acc_ctrlrequest 80.06 v0304 i0409 l255
<6>[    1.312167] acc_ctrlrequest 80.06 v0200 i0000 l255
<6>[    1.312536] acc_ctrlrequest 80.06 v0300 i0000 l255
<6>[    1.312790] acc_ctrlrequest 80.06 v0303 i0409 l255
<6>[    1.312934] acc_ctrlrequest 80.06 v0300 i0000 l255
<6>[    1.313031] acc_ctrlrequest 80.06 v0303 i0409 l255
<6>[    2.393334] acc_ctrlrequest 80.06 v0200 i0000 l9
<6>[    2.393603] acc_ctrlrequest 80.06 v0200 i0000 l32
<6>[    3.985625] usb 1-1: new high-speed USB device number 2 using musb-hdrc
<6>[    4.127508] usb 1-1: New USB device found, idVendor=05c6, idProduct=9005
<6>[    4.127534] usb 1-1: New USB device strings: Mfr=4, Product=3, SerialNumber=0
<6>[    4.127548] usb 1-1: Product: Qualcomm CDMA Technologies MSM
<6>[    4.127559] usb 1-1: Manufacturer: Qualcomm, Incorporated
<6>[    4.130283] GobiSerial 1-1:1.0: GobiSerial converter detected
<6>[    4.131545] usb 1-1: GobiSerial converter now attached to ttyUSB0
<6>[    4.135667] GobiSerial 1-1:1.2: GobiSerial converter detected
<6>[    4.137470] usb 1-1: GobiSerial converter now attached to ttyUSB1
<6>[    4.141877] cdc_ether 1-1:1.3: eth10: register 'cdc_ether' at usb-musb-hdrc.1-1, CDC Ethernet Device, 00:a0:c6:00:00:00
<6>[    4.812752] android_work: sent uevent USB_STATE=DISCONNECTED
<6>[    5.029986] acc_ctrlrequest 80.06 v0100 i0000 l64
<6>[    5.030170] android_work: sent uevent USB_STATE=CONNECTED
<6>[    5.034837] android_work: sent uevent USB_STATE=DISCONNECTED
<6>[    5.280022] acc_ctrlrequest 80.06 v0100 i0000 l18
<6>[    5.280228] android_work: sent uevent USB_STATE=CONNECTED
<6>[    5.280278] acc_ctrlrequest 80.06 v0200 i0000 l9
<6>[    5.280547] acc_ctrlrequest 80.06 v0300 i0000 l255
<6>[    5.280754] acc_ctrlrequest 80.06 v0304 i0409 l255
<6>[    5.281007] acc_ctrlrequest 80.06 v0200 i0000 l255
<6>[    5.281341] acc_ctrlrequest 80.06 v0300 i0000 l255
<6>[    5.281527] acc_ctrlrequest 80.06 v0303 i0409 l255
<6>[    5.281798] acc_ctrlrequest 80.06 v0300 i0000 l255
<6>[    5.282017] acc_ctrlrequest 80.06 v0303 i0409 l255
<6>[    5.392854] acc_ctrlrequest 80.06 v0100 i0000 l18
<6>[    5.393116] acc_ctrlrequest 80.06 v0200 i0000 l9
<6>[    5.393354] acc_ctrlrequest 80.06 v0200 i0000 l32
<6>[    5.393619] acc_ctrlrequest 00.09 v0001 i0000 l0
<6>[    5.393643]  gadget: high-speed config #1: android
<6>[    5.393822] android_work: sent uevent USB_STATE=CONFIGURED
<6>[    6.008455] warning: `zygote' uses 32-bit capabilities (legacy support in use)
<6>[    8.130269] request_suspend_state: wakeup (3->0) at 8124924795 (2000-01-01 00:00:08.507040251 UTC)
<6>[    8.437754] acc_ctrlrequest 80.06 v0200 i0000 l9
<6>[    8.438069] acc_ctrlrequest 80.06 v0200 i0000 l32
<6>[    8.889518] acc_open
<6>[    8.889570] acc_release
<3>[   12.511946] init: sys_prop: permission denied uid:1003  name:service.bootanim.exit
<7>[   16.015410] eth10: no IPv6 routers present

Thanks a lot for the help.

Hi Markus,

I can see "/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed" entry in sysfs on AM335xEVM. Will you please compare your kernel configuration with the configuration available on below link.

https://gitorious.org/rowboat/kernel/source/03f2a1e9ea7f8b11ff6809f5a75b614011f8adb6:arch/arm/configs/am335x_evm_android_defconfig

Thanks and Regards,

Pankaj Bharadiya

I don't see any clues in the boot log.

"cpufreq" relies upon the regulator framework in order to change voltage.  In turn, the regulator framework uses I2C0 to communicate to the PMIC.  On your board, do you have I2C0 connected to the PMIC?  Is I2C0 enabled in your kernel configuration, and also pin mux'ed correctly?