Hi, On Thu, Feb 01, 2024 at 03:15:34PM -0600, Nishanth Menon wrote: > On 16:19-20240131, Andrew Davis wrote: > > This reboot driver calls into firmware using TI-SCI to reboot the system. > > We register the handler with low priority as we want PSCI to remain the > > main way these devices are rebooted. This driver acts as a fallback if > > PSCI is not able to reboot the system. > > > > Signed-off-by: Andrew Davis <afd@xxxxxx> > > --- > > MAINTAINERS | 1 + > > drivers/power/reset/Kconfig | 7 ++++ > > drivers/power/reset/Makefile | 1 + > > drivers/power/reset/ti-sci-reboot.c | 63 +++++++++++++++++++++++++++++ > > 4 files changed, 72 insertions(+) > > create mode 100644 drivers/power/reset/ti-sci-reboot.c > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 45983bb174fe4..ee67ea497fc56 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -21758,6 +21758,7 @@ F: drivers/clk/keystone/sci-clk.c > > F: drivers/firmware/ti_sci* > > F: drivers/irqchip/irq-ti-sci-inta.c > > F: drivers/irqchip/irq-ti-sci-intr.c > > +F: drivers/power/reset/ti-sci-reboot.c > > F: drivers/reset/reset-ti-sci.c > > F: drivers/soc/ti/ti_sci_inta_msi.c > > F: drivers/pmdomain/ti/ti_sci_pm_domains.c > > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig > > index fece990af4a75..d3e91e54cae24 100644 > > --- a/drivers/power/reset/Kconfig > > +++ b/drivers/power/reset/Kconfig > > @@ -205,6 +205,13 @@ config POWER_RESET_ST > > help > > Reset support for STMicroelectronics boards. > > > > +config POWER_RESET_TI_SCI > > + tristate "TI System Control Interface (TI-SCI) reboot driver" > > + depends on TI_SCI_PROTOCOL > > + help > > + This enables the reboot driver support over TI System Control > > + Interface available on some TI's SoCs. > > + > > config POWER_RESET_TPS65086 > > bool "TPS65086 restart driver" > > depends on MFD_TPS65086 > > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile > > index a95d1bd275d18..881ca58a43b9c 100644 > > --- a/drivers/power/reset/Makefile > > +++ b/drivers/power/reset/Makefile > > @@ -23,6 +23,7 @@ obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o > > obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o > > obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o > > obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o > > +obj-$(CONFIG_POWER_RESET_TI_SCI) += ti-sci-reboot.o > > obj-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o > > obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o > > obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o > > diff --git a/drivers/power/reset/ti-sci-reboot.c b/drivers/power/reset/ti-sci-reboot.c > > new file mode 100644 > > index 0000000000000..400bd5d740f8b > > --- /dev/null > > +++ b/drivers/power/reset/ti-sci-reboot.c > > @@ -0,0 +1,63 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * Texas Instrument's System Control Interface (TI-SCI) reboot driver > > + * > > + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com/ > > + * Andrew Davis <afd@xxxxxx> > > + */ > > + > > +#include <linux/mod_devicetable.h> > > +#include <linux/module.h> > > +#include <linux/platform_device.h> > > +#include <linux/reboot.h> > > + > > +#include <linux/soc/ti/ti_sci_protocol.h> > > + > > +static int ti_sci_reboot_handler(struct sys_off_data *data) > > +{ > > + const struct ti_sci_handle *sci = data->cb_data; > > + const struct ti_sci_core_ops *core_ops = &sci->ops.core_ops; > > + > > + core_ops->reboot_device(sci); > > + > > + return NOTIFY_DONE; > > +} > > + > > +static int ti_sci_reboot_probe(struct platform_device *pdev) > > +{ > > + const struct ti_sci_handle *sci; > > + int err; > > + > > + sci = devm_ti_sci_get_handle(&pdev->dev); > > + if (IS_ERR(sci)) > > + return PTR_ERR(sci); > > + > > + err = devm_register_sys_off_handler(&pdev->dev, > > + SYS_OFF_MODE_RESTART, > > + SYS_OFF_PRIO_LOW, > > + ti_sci_reboot_handler, > > + (void *)sci); > > + if (err) > > + return dev_err_probe(&pdev->dev, err, "Cannot register restart handler\n"); > > + > > + return 0; > > +} > > + > > +static const struct of_device_id ti_sci_reboot_of_match[] = { > > + { .compatible = "ti,sci-reboot", }, > > + { /* sentinel */ }, > > +}; > > +MODULE_DEVICE_TABLE(of, ti_sci_reboot_of_match); > > + > > +static struct platform_driver ti_sci_reboot_driver = { > > + .probe = ti_sci_reboot_probe, > > + .driver = { > > + .name = "ti-sci-reboot", > > + .of_match_table = ti_sci_reboot_of_match, > > + }, > > +}; > > +module_platform_driver(ti_sci_reboot_driver); > > + > > +MODULE_AUTHOR("Andrew Davis <afd@xxxxxx>"); > > +MODULE_DESCRIPTION("TI System Control Interface (TI SCI) Reboot driver"); > > +MODULE_LICENSE("GPL"); > > -- > > 2.39.2 > > Will assume the patch to go via Sebastien. Will be good for the dts to > go via SoC tree. So hoping Sebastien will just pick the driver and > bindings. I will wait for the DT binding discussion to have settled. The driver itself LGTM. -- Sebastian
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