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authorValentin Longchamp <valentin.longchamp@epfl.ch>2009-11-03 18:09:47 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2009-11-14 10:29:14 +0100
commit421bf82e996826452ebe2011419f846a61950784 (patch)
treef1261f7cba7fe0c4bcc354c1a3ed4a34d4c948ef
parent8963c49fdba293fbc21aee1bbae9afa99a52755f (diff)
mx31moboard: serial port fix
We get rid of CTS/RTS lines on uart0 on our platform. This is the port we use as main kernel console. We do not want it to be blocking because of CTS/RTS signals, not allowing the system to boot or print messages. However we often use it with a bluetooth module needing CTS/RTS lines as backup login in case of trouble. To be able to use it, we assert CTS low so that the module can always send chars. Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--arch/arm/mach-mx3/mx31moboard.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/arm/mach-mx3/mx31moboard.c b/arch/arm/mach-mx3/mx31moboard.c
index 9243de54041..ff74fab34c8 100644
--- a/arch/arm/mach-mx3/mx31moboard.c
+++ b/arch/arm/mach-mx3/mx31moboard.c
@@ -45,8 +45,8 @@
static unsigned int moboard_pins[] = {
/* UART0 */
- MX31_PIN_CTS1__CTS1, MX31_PIN_RTS1__RTS1,
MX31_PIN_TXD1__TXD1, MX31_PIN_RXD1__RXD1,
+ MX31_PIN_CTS1__GPIO2_7,
/* UART4 */
MX31_PIN_PC_RST__CTS5, MX31_PIN_PC_VS2__RTS5,
MX31_PIN_PC_BVD2__TXD5, MX31_PIN_PC_BVD1__RXD5,
@@ -101,7 +101,18 @@ static struct platform_device mx31moboard_flash = {
.num_resources = 1,
};
-static struct imxuart_platform_data uart_pdata = {
+static int moboard_uart0_init(struct platform_device *pdev)
+{
+ gpio_request(IOMUX_TO_GPIO(MX31_PIN_CTS1), "uart0-cts-hack");
+ gpio_direction_output(IOMUX_TO_GPIO(MX31_PIN_CTS1), 0);
+ return 0;
+}
+
+static struct imxuart_platform_data uart0_pdata = {
+ .init = moboard_uart0_init,
+};
+
+static struct imxuart_platform_data uart4_pdata = {
.flags = IMXUART_HAVE_RTSCTS,
};
@@ -284,8 +295,9 @@ static void __init mxc_board_init(void)
platform_add_devices(devices, ARRAY_SIZE(devices));
- mxc_register_device(&mxc_uart_device0, &uart_pdata);
- mxc_register_device(&mxc_uart_device4, &uart_pdata);
+ mxc_register_device(&mxc_uart_device0, &uart0_pdata);
+
+ mxc_register_device(&mxc_uart_device4, &uart4_pdata);
mx31moboard_init_sel_gpios();