ARM: iop32x: request and issue reset using gpio
As the IOP GPIO driver supports gpiolib we can use the standard GPIO calls to issue a reset of the machine instead of using the custom gpio_line_set/config calls. Also request the GPIO when initializing the machine. Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Mikael Pettersson <mikpe@it.uu.se> Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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1 changed files with 22 additions and 2 deletions
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@ -30,6 +30,7 @@
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#include <linux/platform_device.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/reboot.h>
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#include <linux/io.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <mach/hardware.h>
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#include <mach/hardware.h>
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#include <asm/irq.h>
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#include <asm/irq.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/arch.h>
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@ -288,8 +289,14 @@ static void n2100_power_off(void)
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static void n2100_restart(enum reboot_mode mode, const char *cmd)
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static void n2100_restart(enum reboot_mode mode, const char *cmd)
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{
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{
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gpio_line_set(N2100_HARDWARE_RESET, GPIO_LOW);
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int ret;
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gpio_line_config(N2100_HARDWARE_RESET, GPIO_OUT);
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ret = gpio_direction_output(N2100_HARDWARE_RESET, 0);
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if (ret) {
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pr_crit("could not drive reset GPIO low\n");
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return;
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}
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/* Wait for reset to happen */
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while (1)
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while (1)
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;
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;
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}
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}
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@ -308,6 +315,19 @@ static void power_button_poll(unsigned long dummy)
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add_timer(&power_button_poll_timer);
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add_timer(&power_button_poll_timer);
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}
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}
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static int __init n2100_request_gpios(void)
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{
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int ret;
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if (!machine_is_n2100())
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return 0;
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ret = gpio_request(N2100_HARDWARE_RESET, "reset");
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if (ret)
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pr_err("could not request reset GPIO\n");
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return 0;
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}
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device_initcall(n2100_request_gpios);
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static void __init n2100_init_machine(void)
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static void __init n2100_init_machine(void)
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{
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{
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