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author | 2023-02-14 17:41:18 +0100 | |
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committer | 2023-02-14 23:02:39 +0100 | |
commit | cec3b46b8bda0cdc93d3ab2bdd14aae5d30ecfd9 (patch) | |
tree | 5ae1bfc9bae17b7ce26de097dec27391904cfd6a | |
parent | power: supply: rt9467: Fix spelling mistake "attache" -> "attach" (diff) | |
download | linux-cec3b46b8bda0cdc93d3ab2bdd14aae5d30ecfd9.tar.gz linux-cec3b46b8bda0cdc93d3ab2bdd14aae5d30ecfd9.tar.bz2 linux-cec3b46b8bda0cdc93d3ab2bdd14aae5d30ecfd9.zip |
power: reset: add Odroid Go Ultra poweroff driver
The Hardkernel Odroid Go Ultra poweroff scheme requires requesting a poweroff
to its two PMICs in order, this represents the poweroff scheme needed to complete
a clean poweroff of the system.
This implement this scheme by implementing a self registering driver to permit
using probe defer until both pmics are finally probed.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
-rw-r--r-- | drivers/power/reset/Kconfig | 7 | ||||
-rw-r--r-- | drivers/power/reset/Makefile | 1 | ||||
-rw-r--r-- | drivers/power/reset/odroid-go-ultra-poweroff.c | 177 |
3 files changed, 185 insertions, 0 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index a8c46ba5878f..7059bd1f2ee7 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -141,6 +141,13 @@ config POWER_RESET_OCELOT_RESET help This driver supports restart for Microsemi Ocelot SoC and similar. +config POWER_RESET_ODROID_GO_ULTRA_POWEROFF + bool "Odroid Go Ultra power-off driver" + depends on ARCH_MESON || COMPILE_TEST + depends on I2C && OF + help + This driver supports Power off for Odroid Go Ultra device. + config POWER_RESET_OXNAS bool "OXNAS SoC restart driver" depends on ARCH_OXNAS diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 0a39424fc558..d763e6735ee3 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o obj-$(CONFIG_POWER_RESET_OXNAS) += oxnas-restart.o obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o +obj-$(CONFIG_POWER_RESET_ODROID_GO_ULTRA_POWEROFF) += odroid-go-ultra-poweroff.o obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o diff --git a/drivers/power/reset/odroid-go-ultra-poweroff.c b/drivers/power/reset/odroid-go-ultra-poweroff.c new file mode 100644 index 000000000000..f46271da4e8e --- /dev/null +++ b/drivers/power/reset/odroid-go-ultra-poweroff.c @@ -0,0 +1,177 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2023 Neil Armstrong <neil.armstrong@linaro.org> + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/of_platform.h> +#include <linux/mfd/rk808.h> +#include <linux/regmap.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/i2c.h> + +/* + * The Odroid Go Ultra has 2 PMICs: + * - RK818 (manages the battery and USB-C power supply) + * - RK817 + * Both PMICs feeds power to the S922X SoC, so they must be powered-off in sequence. + * Vendor does power-off the RK817 first, then the RK818 so here we follow this sequence. + */ + +struct odroid_go_ultra_poweroff_data { + struct device *dev; + struct device *rk817; + struct device *rk818; +}; + +static int odroid_go_ultra_poweroff_prepare(struct sys_off_data *data) +{ + struct odroid_go_ultra_poweroff_data *poweroff_data = data->cb_data; + struct regmap *rk817, *rk818; + int ret; + + /* RK817 Regmap */ + rk817 = dev_get_regmap(poweroff_data->rk817, NULL); + if (!rk817) { + dev_err(poweroff_data->dev, "failed to get rk817 regmap\n"); + return notifier_from_errno(-EINVAL); + } + + /* RK818 Regmap */ + rk818 = dev_get_regmap(poweroff_data->rk818, NULL); + if (!rk818) { + dev_err(poweroff_data->dev, "failed to get rk818 regmap\n"); + return notifier_from_errno(-EINVAL); + } + + dev_info(poweroff_data->dev, "Setting PMICs for power off"); + + /* RK817 */ + ret = regmap_update_bits(rk817, RK817_SYS_CFG(3), DEV_OFF, DEV_OFF); + if (ret) { + dev_err(poweroff_data->dev, "failed to poweroff rk817\n"); + return notifier_from_errno(ret); + } + + /* RK818 */ + ret = regmap_update_bits(rk818, RK818_DEVCTRL_REG, DEV_OFF, DEV_OFF); + if (ret) { + dev_err(poweroff_data->dev, "failed to poweroff rk818\n"); + return notifier_from_errno(ret); + } + + return NOTIFY_OK; +} + +static void odroid_go_ultra_poweroff_put_pmic_device(void *data) +{ + struct device *dev = data; + + put_device(dev); +} + +static int odroid_go_ultra_poweroff_get_pmic_device(struct device *dev, const char *compatible, + struct device **pmic) +{ + struct device_node *pmic_node; + struct i2c_client *pmic_client; + + pmic_node = of_find_compatible_node(NULL, NULL, compatible); + if (!pmic_node) + return -ENODEV; + + pmic_client = of_find_i2c_device_by_node(pmic_node); + of_node_put(pmic_node); + if (!pmic_client) + return -EPROBE_DEFER; + + *pmic = &pmic_client->dev; + + return devm_add_action_or_reset(dev, odroid_go_ultra_poweroff_put_pmic_device, *pmic); +} + +static int odroid_go_ultra_poweroff_probe(struct platform_device *pdev) +{ + struct odroid_go_ultra_poweroff_data *poweroff_data; + int ret; + + poweroff_data = devm_kzalloc(&pdev->dev, sizeof(*poweroff_data), GFP_KERNEL); + if (!poweroff_data) + return -ENOMEM; + + dev_set_drvdata(&pdev->dev, poweroff_data); + + /* RK818 PMIC Device */ + ret = odroid_go_ultra_poweroff_get_pmic_device(&pdev->dev, "rockchip,rk818", + &poweroff_data->rk818); + if (ret) + return dev_err_probe(&pdev->dev, ret, "failed to get rk818 mfd data\n"); + + /* RK817 PMIC Device */ + ret = odroid_go_ultra_poweroff_get_pmic_device(&pdev->dev, "rockchip,rk817", + &poweroff_data->rk817); + if (ret) + return dev_err_probe(&pdev->dev, ret, "failed to get rk817 mfd data\n"); + + /* Register as SYS_OFF_MODE_POWER_OFF_PREPARE because regmap_update_bits may sleep */ + ret = devm_register_sys_off_handler(&pdev->dev, + SYS_OFF_MODE_POWER_OFF_PREPARE, + SYS_OFF_PRIO_DEFAULT, + odroid_go_ultra_poweroff_prepare, + poweroff_data); + if (ret) + return dev_err_probe(&pdev->dev, ret, "failed to register sys-off handler\n"); + + dev_info(&pdev->dev, "Registered Power-Off handler\n"); + + return 0; +} +static struct platform_device *pdev; + +static struct platform_driver odroid_go_ultra_poweroff_driver = { + .driver = { + .name = "odroid-go-ultra-poweroff", + }, + .probe = odroid_go_ultra_poweroff_probe, +}; + +static int __init odroid_go_ultra_poweroff_init(void) +{ + int ret; + + /* Only create when running on the Odroid Go Ultra device */ + if (!of_device_is_compatible(of_root, "hardkernel,odroid-go-ultra")) + return -ENODEV; + + ret = platform_driver_register(&odroid_go_ultra_poweroff_driver); + if (ret) + return ret; + + pdev = platform_device_register_resndata(NULL, "odroid-go-ultra-poweroff", -1, + NULL, 0, NULL, 0); + + if (IS_ERR(pdev)) { + platform_driver_unregister(&odroid_go_ultra_poweroff_driver); + return PTR_ERR(pdev); + } + + return 0; +} + +static void __exit odroid_go_ultra_poweroff_exit(void) +{ + /* Only delete when running on the Odroid Go Ultra device */ + if (!of_device_is_compatible(of_root, "hardkernel,odroid-go-ultra")) + return; + + platform_device_unregister(pdev); + platform_driver_unregister(&odroid_go_ultra_poweroff_driver); +} + +module_init(odroid_go_ultra_poweroff_init); +module_exit(odroid_go_ultra_poweroff_exit); + +MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>"); +MODULE_DESCRIPTION("Odroid Go Ultra poweroff driver"); +MODULE_LICENSE("GPL"); |