974b33586b
Pull ARM SoC fixes from Olof Johansson:
"People are back from the holiday breaks, and it shows. Here are a
bunch of fixes for a number of platforms:
- A couple of small fixes for Nomadik
- A larger set of changes for kirkwood/mvebu
- uart driver selection, dt clocks, gpio-poweroff fixups, a few
__init annotation fixes and some error handling improvement in
their xor dma driver.
- i.MX had a couple of minor fixes (and a critical one for flexcan2
clock setup)
- MXS has a small board fix and a framebuffer bugfix
- A set of fixes for Samsung Exynos, fixing default bootargs and some
Exynos5440 clock issues
- A set of OMAP changes including PM fixes and a few sparse warning
fixups
All in all a bit more positive code delta than we'd ideally want to
see here, mostly from the OMAP PM changes, but nothing overly crazy."
* tag 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (44 commits)
ARM: clps711x: Fix bad merge of clockevents setup
ARM: highbank: save and restore L2 cache and GIC on suspend
ARM: highbank: add a power request clear
ARM: highbank: fix secondary boot and hotplug
ARM: highbank: fix typos with hignbank in power request functions
ARM: dts: fix highbank cpu mpidr values
ARM: dts: add device_type prop to cpu nodes on Calxeda platforms
ARM: mx5: Fix MX53 flexcan2 clock
ARM: OMAP2+: am33xx-hwmod: Fix wrongly terminated am33xx_usbss_mpu_irqs array
pinctrl: mvebu: make pdma clock on dove mandatory
ARM: Dove: Add pinctrl clock to DT
dma: mv_xor: fix error handling for clocks
dma: mv_xor: fix error handling of mv_xor_channel_add()
arm: mvebu: Add missing ; for cpu node.
arm: mvebu: Armada XP MV78230 has only three Ethernet interfaces
arm: mvebu: Armada XP MV78230 has two cores, not one
clk: mvebu: Remove inappropriate __init tagging
ARM: Kirkwood: Use fixed-regulator instead of board gpio call
ARM: Kirkwood: Fix missing sdio clock
ARM: Kirkwood: Switch TWSI1 of 88f6282 to DT clock providers
...
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/*
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* Toggles a GPIO pin to power down a device
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*
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* Jamie Lentin <jm@lentin.co.uk>
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* Andrew Lunn <andrew@lunn.ch>
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*
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* Copyright (C) 2012 Jamie Lentin
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/module.h>
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/*
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* Hold configuration here, cannot be more than one instance of the driver
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* since pm_power_off itself is global.
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*/
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static int gpio_num = -1;
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static int gpio_active_low;
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static void gpio_poweroff_do_poweroff(void)
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{
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BUG_ON(!gpio_is_valid(gpio_num));
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/* drive it active, also inactive->active edge */
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gpio_direction_output(gpio_num, !gpio_active_low);
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mdelay(100);
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/* drive inactive, also active->inactive edge */
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gpio_set_value(gpio_num, gpio_active_low);
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mdelay(100);
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/* drive it active, also inactive->active edge */
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gpio_set_value(gpio_num, !gpio_active_low);
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/* give it some time */
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mdelay(3000);
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WARN_ON(1);
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}
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static int gpio_poweroff_probe(struct platform_device *pdev)
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{
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enum of_gpio_flags flags;
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bool input = false;
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int ret;
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/* If a pm_power_off function has already been added, leave it alone */
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if (pm_power_off != NULL) {
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pr_err("%s: pm_power_off function already registered",
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__func__);
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return -EBUSY;
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}
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gpio_num = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
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if (!gpio_is_valid(gpio_num))
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return gpio_num;
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gpio_active_low = flags & OF_GPIO_ACTIVE_LOW;
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input = of_property_read_bool(pdev->dev.of_node, "input");
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ret = gpio_request(gpio_num, "poweroff-gpio");
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if (ret) {
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pr_err("%s: Could not get GPIO %d", __func__, gpio_num);
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return ret;
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}
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if (input) {
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if (gpio_direction_input(gpio_num)) {
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pr_err("Could not set direction of GPIO %d to input",
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gpio_num);
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goto err;
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}
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} else {
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if (gpio_direction_output(gpio_num, gpio_active_low)) {
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pr_err("Could not set direction of GPIO %d", gpio_num);
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goto err;
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}
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}
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pm_power_off = &gpio_poweroff_do_poweroff;
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return 0;
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err:
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gpio_free(gpio_num);
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return -ENODEV;
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}
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static int gpio_poweroff_remove(struct platform_device *pdev)
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{
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gpio_free(gpio_num);
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if (pm_power_off == &gpio_poweroff_do_poweroff)
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pm_power_off = NULL;
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return 0;
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}
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static const struct of_device_id of_gpio_poweroff_match[] = {
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{ .compatible = "gpio-poweroff", },
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{},
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};
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static struct platform_driver gpio_poweroff_driver = {
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.probe = gpio_poweroff_probe,
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.remove = gpio_poweroff_remove,
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.driver = {
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.name = "poweroff-gpio",
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.owner = THIS_MODULE,
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.of_match_table = of_gpio_poweroff_match,
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},
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};
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module_platform_driver(gpio_poweroff_driver);
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MODULE_AUTHOR("Jamie Lentin <jm@lentin.co.uk>");
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MODULE_DESCRIPTION("GPIO poweroff driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:poweroff-gpio");
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