[U-Boot] [PATCH v7 5/9] arm: serial: Add ability to use pre-initialized UARTs

[Tom Rini]

On Fri, Oct 16, 2015 at 04:27:31PM -0600, Simon Glass wrote:
> Hi Linus,
> 
> On 16 October 2015 at 15:23, Linus Walleij <linus.walleij at linaro.org> wrote:
> > On Wed, Oct 14, 2015 at 6:55 PM, Sergey Temerkhanov
> > <s.temerkhanov at gmail.com> wrote:
> >
> >> On some systems, UART initialization is performed before running U-Boot.
> >> This commit allows to skip UART re-initializaion on those systems
> >>
> >> Signed-off-by: Sergey Temerkhanov <s.temerkhanov at gmail.com>
> >> Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla at cavium.com>
> >>
> >> Reviewed-by: Simon Glass <sjg at chromium.org>
> > (...)
> >
> >> diff --git a/doc/device-tree-bindings/serial/pl01x.txt b/doc/device-tree-bindings/serial/pl01x.txt
> >> index 61c27d1..0591497 100644
> >> --- a/doc/device-tree-bindings/serial/pl01x.txt
> >> +++ b/doc/device-tree-bindings/serial/pl01x.txt
> >> @@ -5,3 +5,6 @@ Required properties:
> >>  - reg: exactly one register range with length 0x1000
> >>  - clock: input clock frequency for the UART (used to calculate the baud
> >>    rate divisor)
> >> +
> >> +Optional properties:
> >> +- u-boot,skip-init: skip UART initialization at start.
> >
> > Again: get this merged in the Linux kernel FIRST. Is it?
> 
> We had a little bit of a chat about this at ELCE. It would be great to
> get these changes merged with the kernel but the amount of
> push-back/energy it requires is still excessive IMO. Any thoughts?

But it also requires that we try.  Did we try here?  My first thought is
that there's a number of things it would be nice to say "don't re-init
stuff" to the kernel as well.

-- 
Tom
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