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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>
This commit is contained in:
Valentin Longchamp 2009-11-03 18:09:47 +01:00 committed by Sascha Hauer
parent 8963c49fdb
commit 421bf82e99
1 changed files with 16 additions and 4 deletions
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20
arch/arm/mach-mx3/mx31moboard.c
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@ -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();