[PATCH] ARM: mxs: Change duart device to use amba-pl011

On Wed, Dec 22, 2010 at 09:25:42PM +0100, Uwe Kleine-K?nig wrote:

Hello Shawn,

On Tue, Dec 21, 2010 at 09:12:10PM +0800, Shawn Guo wrote:

quoted

The mxs duart is actually an amba-pl011 device. This commit changes
the duart device code to dynamically allocate amba-pl011 device,
so that drivers/serial/amba-pl011.c can be used on mxs.

I have problems using this.  The problem I found up to now is that
during probe of the device (triggered by mxs_add_duart ->
amba_device_register -> amba_put_disable_pclk) the uart clock is
disabled.

Which uart clock is disabled?  The PCLK or the UARTCLK (names as defined
in the ARM PL011 TRM).

If the pclk code is disabling the UARTCLK, then add a dummy apb_pclk to
your clock lookups, which is what everyone else who can't control the
APB PCLK does.