[PATCH v2 5/6] ARM: LPC32xx: serial.c: HW bug workaround

[Kevin Wells]

>> If you have a reference (errata ID or similar) it would be nice to
>> have it in the comment and description.
>
>Can you please help out with this one?
>
>In the LPC32xx errata, there is a note about a similar HS UART issue,
>but this one here (Standard UART) must be a different one (or it's a
>bug and the fix is actually targeted at HS UART).
>
>I actually just ported this code from lpclinux.com and assumed that
>NXP knows best about LPC HW bugs. ;-)

There isn't any errata related to this, but something strange was
happening with the serial ports (only in Linux) if I didn't do this.
I stumbled across a 'bug' comment in the pnx4008 port related to
serial, tried the same fix, and the problem went away, so I
(incorrectly) keyed in the errata wording.

Here's the original comment from the ARM pnx4008 port (serial.c):
  48         /* Send a NULL to fix the UART HW bug */
  49         __raw_writel(0x00, UART5_BASE_VA);
  50         __raw_writel(0x00, UART3_BASE_VA);

The HSUART errata is not related to this.

>Thanks in advance,
>
>Roland