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| author | Linus Walleij <linus.walleij@linaro.org> | 2013-09-09 14:45:47 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-09-20 23:03:57 +0200 |
| commit | 7111f8780fcf770d8624d758fd240e585adf7d3c (patch) | |
| tree | 89237602dae060cb483153be7bc4f8cc44810a76 /arch | |
| parent | e9004f5039b3840089cb1cb0fe558a81e2bb55f0 (diff) | |
| download | blackbird-op-linux-7111f8780fcf770d8624d758fd240e585adf7d3c.tar.gz blackbird-op-linux-7111f8780fcf770d8624d758fd240e585adf7d3c.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-iop32x/n2100.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/arm/mach-iop32x/n2100.c b/arch/arm/mach-iop32x/n2100.c index 069144300b77..6bace5bc7ebb 100644 --- a/arch/arm/mach-iop32x/n2100.c +++ b/arch/arm/mach-iop32x/n2100.c @@ -30,6 +30,7 @@ #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/io.h> +#include <linux/gpio.h> #include <mach/hardware.h> #include <asm/irq.h> #include <asm/mach/arch.h> @@ -288,8 +289,14 @@ static void n2100_power_off(void) static void n2100_restart(enum reboot_mode mode, const char *cmd) { - gpio_line_set(N2100_HARDWARE_RESET, GPIO_LOW); - gpio_line_config(N2100_HARDWARE_RESET, GPIO_OUT); + int ret; + + ret = gpio_direction_output(N2100_HARDWARE_RESET, 0); + if (ret) { + pr_crit("could not drive reset GPIO low\n"); + return; + } + /* Wait for reset to happen */ while (1) ; } @@ -308,6 +315,19 @@ static void power_button_poll(unsigned long dummy) add_timer(&power_button_poll_timer); } +static int __init n2100_request_gpios(void) +{ + int ret; + + if (!machine_is_n2100()) + return 0; + + ret = gpio_request(N2100_HARDWARE_RESET, "reset"); + if (ret) + pr_err("could not request reset GPIO\n"); + return 0; +} +device_initcall(n2100_request_gpios); static void __init n2100_init_machine(void) { |
