[PATCH] pl011: added clock management feature

[Russell King - ARM Linux]

On Tue, Nov 09, 2010 at 02:40:12PM -0800, Greg KH wrote:
> On Tue, Nov 09, 2010 at 04:30:37PM +0100, Linus Walleij wrote:
> > From: Grzegorz Sygieda <grzegorz.sygieda at tieto.com>
> > 
> > This patch allows to control the pl011 clock using set_termios
> > callback. Any positive baudrate passed enables clock, otherwise
> > disables. This saves a lot of power on submicron designs since
> > we can clock off and disable unused UARTs.
> 
> That's nice, but it seems like an overload of what people traditionally
> think of when it comes to baud rates.  Why not just power down ports
> that are not open instead?

We already do.  My question to Linus (in a previous message) is why this
isn't sufficient.