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Date:	Wed, 19 Dec 2012 11:22:13 -0800
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	Mike Turquette <mturquette@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Josh Cartwright <josh.cartwright@...com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: Re: [PATCH 4/4] clk: zynq: Use of_init_clk_data()

Hi Stephen,

I guess Josh is the better person to talk about this, since he created the
patches regarding common clock for mainline, but I tried running your series
and ran into this:

Unable to handle kernel NULL pointer dereference at virtual address 0000002a
pgd = c0004000
[0000002a] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT ARM
Modules linked in:
CPU: 0    Tainted: G        W     (3.7.0-rc3-00025-gc11ffdd-dirty #246)
PC is at __clk_prepare+0x20/0x80
LR is at clk_prepare+0x2c/0x44
pc : [<c031659c>]    lr : [<c0316628>]    psr: a0000153
sp : ee02fdd0  ip : ee02fde8  fp : ee02fde4
r10: 00000000  r9 : 00000000  r8 : c0587884
r7 : 00000000  r6 : c05aab98  r5 : fffffffe  r4 : fffffffe
r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : fffffffe
Flags: NzCv  IRQs on  FIQs off  Mode SVC_32  ISA ARM  Segment kernel
Control: 18c5387d  Table: 00004059  DAC: 00000015
Process swapper (pid: 1, stack limit = 0xee02e230)
Stack: (0xee02fdd0 to 0xee030000)
fdc0:                                     c05b6a18 fffffffe ee02fdfc ee02fde8
fde0: c0316628 c0316588 ee085400 fffffffe ee02fe24 ee02fe00 c03c1358 c0316608
fe00: c03c1328 ee085410 c05aab98 c05aab98 00000000 c0587884 ee02fe34 ee02fe28
fe20: c026a5c0 c03c1334 ee02fe5c ee02fe38 c0268f50 c026a5a8 c026a7b8 c0313ac0
fe40: ee085410 ee085410 ee085444 c05aab98 ee02fe7c ee02fe60 c02691c0 c0268e18
fe60: c0269150 c05aab98 c0269150 00000000 ee02fea4 ee02fe80 c0267320 c026915c
fe80: ee00948c ee096df0 c021e02c c05aab98 ed9a0bc0 c05ab3a8 ee02feb4 ee02fea8
fea0: c0268a28 c02672d0 ee02fee4 ee02feb8 c0268408 c0268a0c c04b56d1 00000000
fec0: ee02fee4 c05aab98 c0565e60 00000000 0000006f c0587884 ee02ff14 ee02fee8
fee0: c0269990 c0268340 00000000 00000000 c0565e60 00000000 0000006f c0587884
ff00: 00000000 00000000 ee02ff24 ee02ff18 c026a9cc c02698f0 ee02ff3c ee02ff28
ff20: c0565e84 c026a984 ee02e000 ee02ff40 ee02ff74 ee02ff40 c00086f8 c0565e6c
ff40: c04f72e4 00000000 ee02ff74 00000006 00000006 c0571dac c0571d8c 0000006f
ff60: c0587884 00000000 ee02ffac ee02ff78 c03bf9c4 c0008664 00000006 00000006
ff80: c05511a8 00000000 ee02ffac 00000000 c03bf8cc 00000000 00000000 00000000
ffa0: 00000000 ee02ffb0 c000ea98 c03bf8d8 00000000 00000000 00000000 00000000
ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 0158ec21 0eced1ff
[<c031659c>] (__clk_prepare+0x20/0x80) from [<c0316628>] (clk_prepare+0x2c/0x44)
[<c0316628>] (clk_prepare+0x2c/0x44) from [<c03c1358>] (xuartps_probe+0x30/0x1ac
)
[<c03c1358>] (xuartps_probe+0x30/0x1ac) from [<c026a5c0>] (platform_drv_probe+0x
24/0x28)
[<c026a5c0>] (platform_drv_probe+0x24/0x28) from [<c0268f50>] (driver_probe_devi
ce+0x144/0x344)
[<c0268f50>] (driver_probe_device+0x144/0x344) from [<c02691c0>] (__driver_attac
h+0x70/0x94)
[<c02691c0>] (__driver_attach+0x70/0x94) from [<c0267320>] (bus_for_each_dev+0x5
c/0x8c)
[<c0267320>] (bus_for_each_dev+0x5c/0x8c) from [<c0268a28>] (driver_attach+0x28/
0x30)
[<c0268a28>] (driver_attach+0x28/0x30) from [<c0268408>] (bus_add_driver+0xd4/0x
254)
[<c0268408>] (bus_add_driver+0xd4/0x254) from [<c0269990>] (driver_register+0xac
/0x14c)
[<c0269990>] (driver_register+0xac/0x14c) from [<c026a9cc>] (platform_driver_reg
ister+0x54/0x68)
[<c026a9cc>] (platform_driver_register+0x54/0x68) from [<c0565e84>] (xuartps_ini
t+0x24/0x44)
[<c0565e84>] (xuartps_init+0x24/0x44) from [<c00086f8>] (do_one_initcall+0xa0/0x
170)
[<c00086f8>] (do_one_initcall+0xa0/0x170) from [<c03bf9c4>] (kernel_init+0xf8/0x
2ac)
[<c03bf9c4>] (kernel_init+0xf8/0x2ac) from [<c000ea98>] (ret_from_fork+0x14/0x20
)
Code: e8bd4000 e2504000 01a05004 0a000015 (e594302c) 
---[ end trace 1b75b31a2719ed1d ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b


A probably unique thing I do is, I set the status of uart0 to disabled. This way
I can reuse my rootfs which does not run getty on ttyPS1. And this worked fine
before.

	Soren


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