Hi,everyone,
Recently I got a problem on add_plataform_device,I am not famliar on this questions. And I always work hard on th google to find a similar question,
and some told me the problems was on the clk get, but I didn't how to do,any ideals will be appriciated!Thank you!

U-Boot 1.1.6 (Jul 12 2012 - 15:49:11) for FriendlyARM MINI6410


CPU: S3C6410@532MHz
Fclk = 532MHz, Hclk = 133MHz, Pclk = 66MHz, Serial = CLKUART (SYNC Mode
)
Board: MINI6410
DRAM: 256 MB
Flash: 0 kB
NAND: 256 MB
In: serial
Out: serial
Err: serial
MAC: 08:90:90:90:90:90
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x80000, size 0x500000
........................................Boot with zImage

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Initializing cgroup subsys cpu
Linux version 2.6.38-FriendlyARM (root@HelloAndroid) (gcc version 4.5.1 (ctng-1.
8.1-FA) ) #7 PREEMPT Thu Sep 6 14:11:56 HKT 2012
CPU: ARMv6-compatible processor [410fb766] revision 6 (ARMv7), cr=00c5387f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: MINI6410
Memory policy: ECC disabled, Data cache writeback
CPU S3C6410 (id 0x36410101)
S3C24XX Clocks, Copyright 2004 Simtec Electronics
camera: no parent clock specified
S3C64XX: PLL settings, A=532000000, M=532000000, E=24000000
S3C64XX: HCLK2=266000000, HCLK=133000000, PCLK=66500000
mout_apll: source is fout_apll (1), rate is 532000000
mout_epll: source is epll (1), rate is 24000000
mout_mpll: source is mpll (1), rate is 532000000
mmc_bus: source is mout_epll (0), rate is 24000000
mmc_bus: source is mout_epll (0), rate is 24000000
mmc_bus: source is mout_epll (0), rate is 24000000
usb-bus-host: source is clk_48m (0), rate is 48000000
uclk1: source is dout_mpll (1), rate is 66500000
spi-bus: source is mout_epll (0), rate is 24000000
spi-bus: source is mout_epll (0), rate is 24000000
audio-bus: source is mout_epll (0), rate is 24000000
audio-bus: source is mout_epll (0), rate is 24000000
audio-bus: source is mout_epll (0), rate is 24000000
irda-bus: source is mout_epll (0), rate is 24000000
camera: no parent clock specified
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024
Kernel command line: root=ubi0:FriendlyARM-root ubi.mtd=2 rootfstype=ubifs init=
/linuxrc console=ttySAC0,115200
PID hash table entries: 1024 (order: 0, 4096 bytes)
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 256MB = 256MB total
Memory: 254212k/254212k available, 7932k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xff600000 - 0xffe00000 ( 8 MB)
vmalloc : 0xd0800000 - 0xf6000000 ( 600 MB)
lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0171000 (1444 kB)
.text : 0xc0171000 - 0xc051ad30 (3752 kB)
.data : 0xc051c000 - 0xc0545fe0 ( 168 kB)
SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Preemptable hierarchical RCU implementation.
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:246
VIC @f6000000: id 0x00041192, vendor 0x41
VIC @f6010000: id 0x00041192, vendor 0x41
Console: colour dummy device 80x30
console [ttySAC0] enabled
Calibrating delay loop... 530.84 BogoMIPS (lpj=2654208)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
------------[ cut here ]------------
WARNING: at lib/kref.c:34 kref_get+0x20/0x3c()
Modules linked in:
[<c0180cf4>] (unwind_backtrace+0x0/0xe4) from [<c0191cc8>] (warn_slowpath_common
+0x4c/0x64)
[<c0191cc8>] (warn_slowpath_common+0x4c/0x64) from [<c0191cf8>] (warn_slowpath_n
ull+0x18/0x1c)
[<c0191cf8>] (warn_slowpath_null+0x18/0x1c) from [<c02dc988>] (kref_get+0x20/0x3
c)
[<c02dc988>] (kref_get+0x20/0x3c) from [<c02db6dc>] (kobject_get+0x14/0x1c)
[<c02db6dc>] (kobject_get+0x14/0x1c) from [<c031db80>] (get_device+0x14/0x1c)
[<c031db80>] (get_device+0x14/0x1c) from [<c031e944>] (device_add+0x74/0x528)
[<c031e944>] (device_add+0x74/0x528) from [<c032245c>] (platform_device_add+0x10
8/0x164)
[<c032245c>] (platform_device_add+0x108/0x164) from [<c032271c>] (platform_add_d
evices+0x20/0x5c)
[<c032271c>] (platform_add_devices+0x20/0x5c) from [<c000a60c>] (customize_machi
ne+0x1c/0x28)
[<c000a60c>] (customize_machine+0x1c/0x28) from [<c01714d8>] (do_one_initcall+0x
bc/0x190)
[<c01714d8>] (do_one_initcall+0xbc/0x190) from [<c0008adc>] (kernel_init+0x98/0x
148)
[<c0008adc>] (kernel_init+0x98/0x148) from [<c017c6c8>] (kernel_thread_exit+0x0/
0x8)
---[ end trace 1b75b31a2719ed1c ]---
Unable to handle kernel NULL pointer dereference at virtual address 00000021
pgd = c0004000
[00000021] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT
last sysfs file:
Modules linked in:
CPU: 0 Tainted: G W (2.6.38-FriendlyARM #7)
PC is at sysfs_create_dir+0x24/0xe0
LR is at kobject_add_internal+0xd0/0x1e8
pc : [<c0237578>] lr : [<c02db7b4>] psr: a0000013
sp : cf82dee8 ip : 00003f00 fp : 00000000
r10: 00000000 r9 : 00000000 r8 : 00000013
r7 : c015ee20 r6 : 00000000 r5 : c05237c8 r4 : c05237c8
r3 : c0525d50 r2 : cf82df00 r1 : c05237cc r0 : c05237c8
Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 00c5387f Table: 50004008 DAC: 00000015
Process swapper (pid: 1, stack limit = 0xcf82c268)
Stack: (0xcf82dee8 to 0xcf82e000)
dee0: c05237c8 c05237cc cf82df00 cf84db80 c05237c8 c05237c8
df00: c0525d50 c02db7b4 c05237c8 c0525d50 00000000 c015ee20 00000013 c02dbba0
df20: c05237c8 cf82df3c c05237c0 c05237c8 00000000 c031e970 00000000 00000000
df40: c05237c8 c0525d48 00000021 c02dbac8 ffffffff c05237b8 0000000d c05237b8
df60: 00000000 00000000 c015ee20 00000013 00000000 00000000 00000000 c032245c
df80: ffffffff c015ede8 0000000d 00000000 c015ee20 c032271c c0022274 c002255c
dfa0: c017c6c8 c000a5f0 00000000 c000a60c cf82c000 c01714d8 00000000 c0170000
dfc0: 00000013 000000f5 c053043c c0022274 c002255c c017c6c8 00000013 00000000
dfe0: 00000000 c0008adc 00000000 00000000 c0008a44 c017c6c8 ffffffff ffffffff
[<c0237578>] (sysfs_create_dir+0x24/0xe0) from [<c02db7b4>] (kobject_add_interna
l+0xd0/0x1e8)
[<c02db7b4>] (kobject_add_internal+0xd0/0x1e8) from [<c02dbba0>] (kobject_add+0x
68/0x8c)
[<c02dbba0>] (kobject_add+0x68/0x8c) from [<c031e970>] (device_add+0xa0/0x528)
[<c031e970>] (device_add+0xa0/0x528) from [<c032245c>] (platform_device_add+0x10
8/0x164)
[<c032245c>] (platform_device_add+0x108/0x164) from [<c032271c>] (platform_add_d
evices+0x20/0x5c)
[<c032271c>] (platform_add_devices+0x20/0x5c) from [<c000a60c>] (customize_machi
ne+0x1c/0x28)
[<c000a60c>] (customize_machine+0x1c/0x28) from [<c01714d8>] (do_one_initcall+0x
bc/0x190)
[<c01714d8>] (do_one_initcall+0xbc/0x190) from [<c0008adc>] (kernel_init+0x98/0x
148)
[<c0008adc>] (kernel_init+0x98/0x148) from [<c017c6c8>] (kernel_thread_exit+0x0/
0x8)
Code: e594300c e3530000 15936018 059f60ac (e5d65021)
---[ end trace 1b75b31a2719ed1d ]---
Kernel panic - not syncing: Attempted to kill init!
[<c0180cf4>] (unwind_backtrace+0x0/0xe4) from [<c040ed38>] (panic+0x58/0x174)
[<c040ed38>] (panic+0x58/0x174) from [<c0194ab4>] (do_exit+0x68/0x5e4)
[<c0194ab4>] (do_exit+0x68/0x5e4) from [<c017f334>] (die+0x190/0x1c0)
[<c017f334>] (die+0x190/0x1c0) from [<c0181c68>] (__do_kernel_fault+0x64/0x84)
[<c0181c68>] (__do_kernel_fault+0x64/0x84) from [<c0181e60>] (do_page_fault+0x1d
8/0x1f4)
[<c0181e60>] (do_page_fault+0x1d8/0x1f4) from [<c0171218>] (do_DataAbort+0x30/0x
98)
[<c0171218>] (do_DataAbort+0x30/0x98) from [<c017b22c>] (__dabt_svc+0x4c/0x60)
Exception stack(0xcf82dea0 to 0xcf82dee8)
dea0: c05237c8 c05237cc cf82df00 c0525d50 c05237c8 c05237c8 00000000 c015ee20
dec0: 00000013 00000000 00000000 00000000 00003f00 cf82dee8 c02db7b4 c0237578
dee0: a0000013 ffffffff
[<c017b22c>] (__dabt_svc+0x4c/0x60) from [<c0237578>] (sysfs_create_dir+0x24/0xe
0)
[<c0237578>] (sysfs_create_dir+0x24/0xe0) from [<c02db7b4>] (kobject_add_interna
l+0xd0/0x1e8)
[<c02db7b4>] (kobject_add_internal+0xd0/0x1e8) from [<c02dbba0>] (kobject_add+0x
68/0x8c)
[<c02dbba0>] (kobject_add+0x68/0x8c) from [<c031e970>] (device_add+0xa0/0x528)
[<c031e970>] (device_add+0xa0/0x528) from [<c032245c>] (platform_device_add+0x10
8/0x164)
[<c032245c>] (platform_device_add+0x108/0x164) from [<c032271c>] (platform_add_d
evices+0x20/0x5c)
[<c032271c>] (platform_add_devices+0x20/0x5c) from [<c000a60c>] (customize_machi
ne+0x1c/0x28)
[<c000a60c>] (customize_machine+0x1c/0x28) from [<c01714d8>] (do_one_initcall+0x
bc/0x190)
[<c01714d8>] (do_one_initcall+0xbc/0x190) from [<c0008adc>] (kernel_init+0x98/0x
148)
[<c0008adc>] (kernel_init+0x98/0x148) from [<c017c6c8>] (kernel_thread_exit+0x0/
0x8)