linux-kernel - Re: [PATCH 1/8] serial: exar: Preconfigure xr17v35x MPIOs as output

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Date:   Fri, 26 May 2017 20:38:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-serial@...r.kernel.org, linux-gpio@...r.kernel.org,
        Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>
Subject: Re: [PATCH 1/8] serial: exar: Preconfigure xr17v35x MPIOs as output

On Fri, May 26, 2017 at 03:04:26PM +0200, Jan Kiszka wrote:
> Greg,
> 
> On 2017-05-13 09:28, Jan Kiszka wrote:
> > This is the safe default for GPIOs with unknown external wiring.
> > 
> > Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> > ---
> >  drivers/tty/serial/8250/8250_exar.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
> > index 1270ff163f63..b4fa585156c7 100644
> > --- a/drivers/tty/serial/8250/8250_exar.c
> > +++ b/drivers/tty/serial/8250/8250_exar.c
> > @@ -177,13 +177,13 @@ static void setup_gpio(u8 __iomem *p)
> >  	writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
> >  	writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
> >  	writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
> > -	writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
> > +	writeb(0xff, p + UART_EXAR_MPIOSEL_7_0);
> >  	writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
> >  	writeb(0x00, p + UART_EXAR_MPIOINT_15_8);
> >  	writeb(0x00, p + UART_EXAR_MPIOLVL_15_8);
> >  	writeb(0x00, p + UART_EXAR_MPIO3T_15_8);
> >  	writeb(0x00, p + UART_EXAR_MPIOINV_15_8);
> > -	writeb(0x00, p + UART_EXAR_MPIOSEL_15_8);
> > +	writeb(0xff, p + UART_EXAR_MPIOSEL_15_8);
> >  	writeb(0x00, p + UART_EXAR_MPIOOD_15_8);
> >  }
> >  
> > 
> 
> Please drop from this tty-next, it may break Commtech adapters. I have
> an update ready.
> 
> I may also send a fix on top if that is preferred, just let me know.

I need a fixup patch, I can't drop a patch, only revert it.

thanks,

greg k-h