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Message-ID: <21479d70-9749-0268-cd4b-921b7a2380f8@linaro.org>
Date: Tue, 14 Feb 2023 17:33:58 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v3] power: reset: add Odroid Go Ultra poweroff driver
On 13/02/2023 21:42, Sebastian Reichel wrote:
> Hi,
>
> On Fri, Feb 10, 2023 at 11:03:36AM +0100, Neil Armstrong wrote:
>> 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@...aro.org>
>> ---
>> Previous submission was at [1], but I converted it to an independent
>> platform device with device auto registration to permit waiting for
>> both the PMICs drivers to probe.
>>
>> [1] https://lore.kernel.org/all/20221031-b4-odroid-go-ultra-initial-v1-2-42e3dbea86d5@linaro.org/
>> ---
>> Changes in v3:
>> - Removed dependency with rk08
>> - Switched to storing struct device of pmics
>> - Fixed module init/exit
>> - Link to v2: https://lore.kernel.org/r/20230126-b4-odroid-go-ultra-poweroff-v2-1-a8c50866f4ac@linaro.org
>>
>> Changes in v2:
>> - Switched to devm_register_sys_off_handler()
>> - Link to v1: https://lore.kernel.org/r/20221031-b4-odroid-go-ultra-initial-v1-2-42e3dbea86d5@linaro.org
>> ---
>> drivers/power/reset/Kconfig | 7 +
>> drivers/power/reset/Makefile | 1 +
>> drivers/power/reset/odroid-go-ultra-poweroff.c | 193 +++++++++++++++++++++++++
>> 3 files changed, 201 insertions(+)
>>
>> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
>> index a8c46ba5878f..a47ef7a9fc13 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 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..30a005088fbe
>> --- /dev/null
>> +++ b/drivers/power/reset/odroid-go-ultra-poweroff.c
>> @@ -0,0 +1,193 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Copyright (c) 2023 Neil Armstrong <neil.armstrong@...aro.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 int odroid_go_ultra_poweroff_get_pmic_device(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 0;
>> +}
>> +
>> +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("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("rockchip,rk817",
>> + &poweroff_data->rk817);
>> + if (ret) {
>> + ret = dev_err_probe(&pdev->dev, ret, "failed to get rk817 mfd data\n");
>> + goto put_rk818_device;
>> + }
>> +
>> + /* 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) {
>> + ret = dev_err_probe(&pdev->dev, ret, "failed to register sys-off handler\n");
>> + goto put_rk817_device;
>> + }
>
> Allocating managed resources after a traditional allocation always
> rings an alarm bell. The problem is, that the order at removal time
> will not be the reverse of the allocation chain in this case.
>
> You can fix this by handling the put_device for rk817 and rk818 via
> devm_add_action_or_reset() (preferred by me) or by switching
> devm_register_sys_off_handler() to register_sys_off_handler.
Good point, I've added a devm_add_action_or_reset() into odroid_go_ultra_poweroff_get_pmic_device()
Thanks,
Neil
>
> Otherwise the driver LGTM.
>
> -- Sebastian
>
>> +
>> + dev_info(&pdev->dev, "Registered Power-Off handler\n");
>> +
>> + return 0;
>> +
>> +put_rk817_device:
>> + put_device(poweroff_data->rk817);
>> +
>> +put_rk818_device:
>> + put_device(poweroff_data->rk818);
>> +
>> + return ret;
>> +}
>> +
>> +static int odroid_go_ultra_poweroff_remove(struct platform_device *pdev)
>> +{
>> + struct odroid_go_ultra_poweroff_data *poweroff_data = dev_get_drvdata(&pdev->dev);
>> +
>> + put_device(poweroff_data->rk818);
>> + put_device(poweroff_data->rk817);
>> +
>> + 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,
>> + .remove = odroid_go_ultra_poweroff_remove,
>> +};
>> +
>> +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@...aro.org>");
>> +MODULE_DESCRIPTION("Odroid Go Ultra poweroff driver");
>> +MODULE_LICENSE("GPL");
>>
>> ---
>> base-commit: 38d2b86a665b5e86371a1a30228bce259aa6c101
>> change-id: 20230126-b4-odroid-go-ultra-poweroff-c8fdca93f3eb
>>
>> Best regards,
>> --
>> Neil Armstrong <neil.armstrong@...aro.org>
>>
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