[U-Boot] [U-Boot, v4, 2/2] serial: bcm283x_mu: Detect disabled serial device

[Tom Rini]

On Mon, Aug 15, 2016 at 05:48:51PM +0200, Alexander Graf wrote:

> On the raspberry pi, you can disable the serial port to gain dynamic frequency
> scaling which can get handy at times.
> 
> However, in such a configuration the serial controller gets its rx queue filled
> up with zero bytes which then happily get transmitted on to whoever calls
> getc() today.
> 
> This patch adds detection logic for that case by checking whether the RX pin is
> mapped to GPIO15 and disables the mini uart if it is not mapped properly.
> 
> That way we can leave the driver enabled in the tree and can determine during
> runtime whether serial is usable or not, having a single binary that allows for
> uart and non-uart operation.
> 
> Signed-off-by: Alexander Graf <agraf at suse.de>
> Acked-by: Stephen Warren <swarren at wwwdotorg.org>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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