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tty: serial: cpm_uart: Adding proper request of GPIO used by cpm_uart driver

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cpm_uart serial driver uses GPIO for control signals. In order to be used
properly, GPIOs have to be reserved. Comment in gpiolib.c considers illegal
the use of GPIOs without requesting them. In addition, the direction of the
GPIO has to be set properly.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christophe Leroy 2013-08-21 17:59:24 +02:00 committed by Greg Kroah-Hartman
parent b60dfbae41
commit a416bfa2a6
1 changed files with 26 additions and 2 deletions
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28
drivers/tty/serial/cpm_uart/cpm_uart_core.c
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@ -1213,8 +1213,32 @@ static int cpm_uart_init_port(struct device_node *np,
goto out_pram;
}
for (i = 0; i < NUM_GPIOS; i++)
pinfo->gpios[i] = of_get_gpio(np, i);
for (i = 0; i < NUM_GPIOS; i++) {
int gpio;
pinfo->gpios[i] = -1;
gpio = of_get_gpio(np, i);
if (gpio_is_valid(gpio)) {
ret = gpio_request(gpio, "cpm_uart");
if (ret) {
pr_err("can't request gpio #%d: %d\n", i, ret);
continue;
}
if (i == GPIO_RTS || i == GPIO_DTR)
ret = gpio_direction_output(gpio, 0);
else
ret = gpio_direction_input(gpio);
if (ret) {
pr_err("can't set direction for gpio #%d: %d\n",
i, ret);
gpio_free(gpio);
continue;
}
pinfo->gpios[i] = gpio;
}
}
#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
udbg_putc = NULL;