[PATCH v2 1/2] arm64: dts: marvell: add CP110 uart peripherals

Russell King - ARM Linux linux at armlinux.org.uk
Wed Feb 14 03:07:51 PST 2018


On Wed, Feb 14, 2018 at 12:56:53PM +0200, Baruch Siach wrote:
> Hi Gregory,
> 
> On Wed, Feb 14, 2018 at 11:42:52AM +0100, Gregory CLEMENT wrote:
> >  On mer., janv. 31 2018, Baruch Siach <baruch at tkos.co.il> wrote:
> > 
> > > The CP110 component has 4 uart peripherals. All of them use the same clock
> > > gate for slow peripherals that is shared with the i2c and spi peripherals.
> > >
> > > Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> > 
> > Applied on mvebu/dt64
> 
> Thanks.
> 
> What about patch 2/2 in this series?

I'm not entirely convinced that it's something that should be done.
I know that some people are already using the UART headers for other
purposes (other than UART) and the later revision boards have the
placement of the microUSB fixed so it is accessible.

While you can tell Linux to use the other UART headers with this
patch, uboot won't use them, which means you can't configure the
boot loader without (in your case) taking the board out of the case.

I've a similar problem (with the mcbin in a rackmount case), and my
solution to that has been to put a single washer under the mounting
post near the microUSB to lift the board sufficiently to allow a
connector to be plugged in.  Sometimes simple hardware fixes are
better than software fixes.

Others have used a dremel to modify the case to access the microUSB.

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