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

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Message-Id: <6155891d19531be018d30fd55ffd6d42493af8c1.1494660546.git.jan.kiszka@siemens.com>
Date:   Sat, 13 May 2017 09:28:59 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>
Cc:     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: [PATCH 1/8] serial: exar: Preconfigure xr17v35x MPIOs as output

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);
 }
 
-- 
2.12.0