Hi,
On 01/22/2015 10:06 AM, Sebastian Reichel wrote:
> Hi,
>
> On Wed, Oct 29, 2014 at 02:13:28PM +0100, Marek Szyprowski wrote:
>> This patch adds a driver implementing correct reboot and poweroff
>> procedures for Exynos4412-based Hardkernel's Odroid X/X2/U2/U3/U3+
>> boards.
>
> Sorry it took so long. I have a couple of small requests before
> applying this (comments inline).
>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
>> ---
>> .../bindings/power/reset/odroid-reset.txt | 18 ++++
>> drivers/power/reset/Kconfig | 6 ++
>> drivers/power/reset/Makefile | 1 +
>> drivers/power/reset/odroid-reboot.c | 119 +++++++++++++++++++++
>> 4 files changed, 144 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/power/reset/odroid-reset.txt
>> create mode 100644 drivers/power/reset/odroid-reboot.c
>>
>> diff --git a/Documentation/devicetree/bindings/power/reset/odroid-reset.txt b/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
>> new file mode 100644
>> index 000000000000..86471a463518
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
>> @@ -0,0 +1,18 @@
>> +* Device tree bindings for Hardkernel's Exynos4412 based Odroid boards
>> +
>> +This node is intended to allow proper system reboot and power off of
>> +Odroid X/X2/U2/U3/U3+ boards with eMMC storage. Without this node, board
>> +hangs during standard reset procedure.
>> +
>> +Required properties:
>> +- compatible: hardkernel,odroid-reboot
>> +- samsung,pmureg-phandle: phandle to Exynos PMU node
>> +- reset-gpios: phandle and gpio-specifier to the GPIO pin
>> + connected to the eMMC_nDET
>> +
>> +Example:
>> +odroid_reboot {
>> + compatible = "hardkernel,odroid-reboot";
>> + samsung,pmureg-phandle = <&pmu_system_controller>;
>> + reset-gpio = <&gpk1 2 0>;
>> +};
>> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
>> index f65ff49bb275..f02b13d5344f 100644
>> --- a/drivers/power/reset/Kconfig
>> +++ b/drivers/power/reset/Kconfig
>> @@ -84,6 +84,12 @@ config POWER_RESET_LTC2952
>> This driver supports an external powerdown trigger and board power
>> down via the LTC2952. Bindings are made in the device tree.
>>
>> +config POWER_RESET_ODROID
>> + bool "Hardkernel's Exynos4412 based Odroid reboot driver"
>> + depends on POWER_RESET && ARCH_EXYNOS
>
> once the arm specific restart handler is gone you can add ||
> COMPILE_TEST
>
>> + help
>> + Power off and restart support for Odroid boards.
>> +
>> config POWER_RESET_QNAP
>> bool "QNAP power-off driver"
>> depends on OF_GPIO && PLAT_ORION
>> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
>> index 76ce1c59469b..178ee86eb813 100644
>> --- a/drivers/power/reset/Makefile
>> +++ b/drivers/power/reset/Makefile
>> @@ -8,6 +8,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
>> obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
>> obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
>> obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
>> +obj-$(CONFIG_POWER_RESET_ODROID) += odroid-reboot.o
>> obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
>> obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
>> obj-$(CONFIG_POWER_RESET_SUN6I) += sun6i-reboot.o
>> diff --git a/drivers/power/reset/odroid-reboot.c b/drivers/power/reset/odroid-reboot.c
>> new file mode 100644
>> index 000000000000..823e93539220
>> --- /dev/null
>> +++ b/drivers/power/reset/odroid-reboot.c
>> @@ -0,0 +1,119 @@
>> +/*
>> + * Copyright (c) 2014 Samsung Electronics Co., Ltd.
>> + * http://www.samsung.com
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/gpio.h>
>> +#include <linux/io.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/module.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_gpio.h>
>> +#include <linux/reboot.h>
>> +#include <linux/regmap.h>
>> +
>> +#include <asm/system_misc.h>
>> +
>> +#define PS_HOLD_CONTROL 0x330C
>> +
>> +struct odroid_reboot_data {
>> + struct device *dev;
>> + int power_gpio;
>> + struct regmap *reg_pmu;
>> + void (*reboot_func)(enum reboot_mode mode, const char *cmd);
>> +};
>> +
>> +static struct odroid_reboot_data *reboot_data;
>> +
>> +static void odroid_reboot(enum reboot_mode mode, const char *cmd)
>> +{
>> + local_irq_disable();
>> +
>> + gpio_set_value(reboot_data->power_gpio, 0);
>> + mdelay(150);
>> + gpio_set_value(reboot_data->power_gpio, 1);
>> +
>> + reboot_data->reboot_func(mode, cmd);
>> +
It is called do_kernel_restart() if arm_pm_restart is NULL from
machine_restart of arch/arm/kernel/process.c
How about this?
if (reboot_data->reboot_func)
reboot_data->reboot_func(mode, cmd);
else
do_kernel_restart(cmd);
>> + pr_emerg("%s: waiting for reboot\n", __func__);
>> + while (1)
>> + ;
Then this endless loop is also unnecessary.
Thanks.
>> +}
>> +
>> +static void odroid_power_off(void)
>> +{
>> + regmap_update_bits(reboot_data->reg_pmu, PS_HOLD_CONTROL, 0xffffffff, 0x5200);
>> + while (1) {
>> + pr_emerg("%s: should not reach here!\n", __func__);
>> + msleep(1000);
>> + }
>> +}
>> +
>> +static struct odroid_reboot_data *odroid_reboot_parse_dt(struct device *dev)
>> +{
>> + struct device_node *np = dev->of_node;
>> + struct odroid_reboot_data *data;
>> +
>> + data = devm_kzalloc(dev, sizeof(struct odroid_reboot_data), GFP_KERNEL);
>> + if (!data)
>> + return NULL;
>> +
>> + data->power_gpio = of_get_named_gpio(np, "reset-gpios", 0);
>> + if (!gpio_is_valid(data->power_gpio)) {
>> + dev_err(dev, "invalid reset gpio pin\n");
>> + return NULL;
>> + }
>> + devm_gpio_request(dev, data->power_gpio, "reset");
>
> please use gpiod interface.
>
>> +
>> + data->reg_pmu = syscon_regmap_lookup_by_phandle(np,
>> + "samsung,pmureg-phandle");
>> + if (IS_ERR(data->reg_pmu)) {
>> + dev_err(dev, "failed to map PMU registers\n");
>> + return NULL;
>> + }
>> +
>> + return data;
>> +}
>> +
>> +static int odroid_reboot_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> +
>> + if (pdev->dev.of_node)
>> + reboot_data = odroid_reboot_parse_dt(dev);
>> +
>> + if (!reboot_data)
>> + return -EINVAL;
>> +
>> + reboot_data->dev = &pdev->dev;
>> + reboot_data->reboot_func = arm_pm_restart;
>> +
>> + /* grab reboot arm specific hook */
>> + arm_pm_restart = odroid_reboot;
>
> please use register_restart_handler() and
> unregister_restart_handler() in remove function.
>
>> + /* register power off function */
>> + pm_power_off = odroid_power_off;
>> +
>> + return 0;
>> +}
>> +
>> +static struct of_device_id odroid_reboot_of_match[] = {
>> + { .compatible = "hardkernel,odroid-reboot", },
>> + { },
>> +};
>> +
>> +static struct platform_driver odroid_reboot_driver = {
>> + .probe = odroid_reboot_probe,
>> + .driver = {
>> + .name = "odroid-reboot",
>> + .owner = THIS_MODULE,
>
> Please remove .owner line (not needed, will trigger a coccinelle
> warning).
>
>> + .of_match_table = of_match_ptr(odroid_reboot_of_match),
>> + }
>> +};
>> +module_platform_driver(odroid_reboot_driver);
>
> -- Sebastian
>
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