* Sebastian Andrzej Siewior [off-list ref] [140716 07:47]:

This patch provides a 8250-core based UART driver for the internal OMAP
UART. The longterm goal is to provide the same functionality as the
current OMAP uart driver and hopefully DMA support which could borrowed
from the 8250-core.

It has been only tested as console UART on am335x-evm and dra7-evm.
The device name is ttyS based instead of ttyO. If a ttyO based node name
is required please ask udev for it. If both driver are activated (this
and omap-serial) then this serial driver will take control over the
device due to the link order

v3?v4:
	- drop RS485 support
	- wire up ->throttle / ->unthrottle
v2?v3:
	- wire up startup & shutdown for wakeup-irq handling.
	- RS485 handling (well the core does).

v1?v2:
	- added runtime PM. Could somebody could plese double check
	  this?
	- added omap_8250_set_termios()

Seems to boot a bit further now with output from serial console
initially, then I'm getting the following error again that's probably
related to clocks not enabled when the registers are accessed:

[    1.050231] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    1.068664] 4806a000.serial: ttyS0 at MMIO 0x4806a000 (irq = 88, base_baud = 3000000) is a OMAP
[    1.074676] 4806c000.serial: ttyS1 at MMIO 0x4806c000 (irq = 89, base_baud = 3000000) is a OMAP
[    1.078613] console [ttyS2] disabled
[    1.079193] 49020000.serial: ttyS2 at MMIO 0x49020000 (irq = 90, base_baud = 3000000) is a OMAP
[    1.938110] console [ttyS2] enabled
[    1.946533] 49042000.serial: ttyS3 at MMIO 0x49042000 (irq = 96, base_baud = 3000000) is a OMAP
...
[    5.538421] Unhandled fault: external abort on non-linefetch (0x1028) at 0xfb020000
[    5.546142] Internal error: : 1028 [#1] SMP ARM
[    5.550720] Modules linked in:
[    5.553802] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.16.0-rc5-00070-g1f95851 #129
[    5.561584] task: ce058b00 ti: ce05a000 task.ti: ce05a000
[    5.567016] PC is at mem32_serial_in+0xc/0x1c
[    5.571411] LR is at serial8250_do_startup+0xc8/0x89c
[    5.576507] pc : [<c034731c>]    lr : [<c034a988>]    psr: 60000113
[    5.576507] sp : ce05bcf0  ip : c0a008e8  fp : ce46c400
[    5.588043] r10: 00000000  r9 : cda7a680  r8 : ce46c68c
[    5.593292] r7 : ce46c400  r6 : 00000000  r5 : ce548e10  r4 : c10abf34
[    5.599853] r3 : fb020000  r2 : 00000002  r1 : fb020000  r0 : c10abf34
[    5.606414] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[    5.613769] Control: 10c5387d  Table: 80004019  DAC: 00000015
[    5.619537] Process swapper/0 (pid: 1, stack limit = 0xce05a248)
...
[    5.835601] [<c034731c>] (mem32_serial_in) from [<c034a988>] (serial8250_do_startup+0xc8/0x89c)
[    5.844360] [<c034a988>] (serial8250_do_startup) from [<c034c58c>] (omap_8250_startup+0x5c/0xdc)
[    5.853179] [<c034c58c>] (omap_8250_startup) from [<c034b170>] (serial8250_startup+0x14/0x20)
[    5.861755] [<c034b170>] (serial8250_startup) from [<c0346584>] (uart_startup.part.3+0x7c/0x1dc)
[    5.870605] [<c0346584>] (uart_startup.part.3) from [<c03470f4>] (uart_open+0xe4/0x124)
[    5.878662] [<c03470f4>] (uart_open) from [<c032c528>] (tty_open+0x130/0x58c)
[    5.885864] [<c032c528>] (tty_open) from [<c01216ec>] (chrdev_open+0x9c/0x174)
[    5.893127] [<c01216ec>] (chrdev_open) from [<c011b8cc>] (do_dentry_open+0x1d0/0x310)
[    5.901000] [<c011b8cc>] (do_dentry_open) from [<c011bd90>] (finish_open+0x34/0x4c)
[    5.908721] [<c011bd90>] (finish_open) from [<c012a8f0>] (do_last.isra.27+0x5a4/0xb98)
[    5.916687] [<c012a8f0>] (do_last.isra.27) from [<c012af98>] (path_openat+0xb4/0x5e4)
[    5.924560] [<c012af98>] (path_openat) from [<c012b7d4>] (do_filp_open+0x2c/0x80)
[    5.932098] [<c012b7d4>] (do_filp_open) from [<c011cd0c>] (do_sys_open+0x100/0x1d0)
[    5.939788] [<c011cd0c>] (do_sys_open) from [<c07b6ce0>] (kernel_init_freeable+0x124/0x1c8)
[    5.948211] [<c07b6ce0>] (kernel_init_freeable) from [<c054ed28>] (kernel_init+0x8/0xe4)
[    5.956359] [<c054ed28>] (kernel_init) from [<c000e868>] (ret_from_fork+0x14/0x2c)
...
[    5.974792] In-band Error seen by MPU  at address 0
[    5.979675] ------------[ cut here ]------------
[    5.984344] WARNING: CPU: 0 PID: 1 at drivers/bus/omap_l3_smx.c:162 omap3_l3_app_irq+0xcc/0x124()
...

Regards,

Tony