[PATCH v4] power: reset: add Odroid Go Ultra poweroff driver
Neil Armstrong
neil.armstrong at linaro.org
Tue Feb 14 08:41:18 PST 2023
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 at linaro.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 v4:
- handle pmic struct device removal by devm_add_action_or_reset()
- add dependency on I2C for of_find_i2c_device_by_node() after kernel test robot reports
- Link to v3: https://lore.kernel.org/r/20230126-b4-odroid-go-ultra-poweroff-v3-1-0a7fd3d5c4b3@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 | 177 +++++++++++++++++++++++++
3 files changed, 185 insertions(+)
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 at 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 at linaro.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 at linaro.org>
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