Messages in this thread | | | From | Anup Patel <> | Date | Tue, 21 Sep 2021 15:46:49 +0530 | Subject | Re: [PATCH] drivers: mfd: da9063: Add restart notifier implementation |
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On Tue, Sep 21, 2021 at 11:04 AM Alexandre Ghiti <alexandre.ghiti@canonical.com> wrote: > > The SiFive Unmatched board uses the da9063 PMIC for reset: add a restart > notifier that will execute a small i2c sequence allowing to reset the > board. > > The original implementation comes from Marcus Comstedt and Anders Montonen > (https://forums.sifive.com/t/reboot-command/4721/28). > > Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> > --- > drivers/mfd/da9063-core.c | 25 +++++++++++++++++++++++++ > include/linux/mfd/da9063/core.h | 3 +++ > 2 files changed, 28 insertions(+) > > diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c > index df407c3afce3..c87b8d611f20 100644 > --- a/drivers/mfd/da9063-core.c > +++ b/drivers/mfd/da9063-core.c > @@ -20,6 +20,7 @@ > #include <linux/mutex.h> > #include <linux/mfd/core.h> > #include <linux/regmap.h> > +#include <linux/reboot.h> > > #include <linux/mfd/da9063/core.h> > #include <linux/mfd/da9063/registers.h> > @@ -158,6 +159,18 @@ static int da9063_clear_fault_log(struct da9063 *da9063) > return ret; > } > > +static int da9063_restart_notify(struct notifier_block *this, > + unsigned long mode, void *cmd) > +{ > + struct da9063 *da9063 = container_of(this, struct da9063, restart_handler); > + > + regmap_write(da9063->regmap, DA9063_REG_PAGE_CON, 0x00); > + regmap_write(da9063->regmap, DA9063_REG_CONTROL_F, 0x04); > + regmap_write(da9063->regmap, DA9063_REG_CONTROL_A, 0x68); > + > + return NOTIFY_DONE; > +} > + > int da9063_device_init(struct da9063 *da9063, unsigned int irq) > { > int ret; > @@ -197,6 +210,18 @@ int da9063_device_init(struct da9063 *da9063, unsigned int irq) > } > } > > + da9063->restart_handler.notifier_call = da9063_restart_notify; > + da9063->restart_handler.priority = 128;
How was this priority value chosen ?
I mean, we will be having SBI SRST as well so we should choose a priority value lower than what we choose for SBI SRST handler.
Regards, Anup
> + ret = register_restart_handler(&da9063->restart_handler); > + if (ret) { > + dev_err(da9063->dev, "Failed to register restart handler\n"); > + return ret; > + } > + > + devm_add_action(da9063->dev, > + (void (*)(void *))unregister_restart_handler, > + &da9063->restart_handler); > + > return ret; > } > > diff --git a/include/linux/mfd/da9063/core.h b/include/linux/mfd/da9063/core.h > index fa7a43f02f27..1b20c498e340 100644 > --- a/include/linux/mfd/da9063/core.h > +++ b/include/linux/mfd/da9063/core.h > @@ -85,6 +85,9 @@ struct da9063 { > int chip_irq; > unsigned int irq_base; > struct regmap_irq_chip_data *regmap_irq; > + > + /* Restart */ > + struct notifier_block restart_handler; > }; > > int da9063_device_init(struct da9063 *da9063, unsigned int irq); > -- > 2.30.2 >
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