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From: Anup Patel <anup@brainfault.org>
To: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Cc: Support Opensource <support.opensource@diasemi.com>,
	Lee Jones <lee.jones@linaro.org>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	"linux-kernel@vger.kernel.org List"
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] drivers: mfd: da9063: Add restart notifier implementation
Date: Tue, 21 Sep 2021 15:46:49 +0530	[thread overview]
Message-ID: <CAAhSdy07KzQnTH+ad4esxtfhogzpXQagY8KeDkq1Kc81-Z33Yw@mail.gmail.com> (raw)
In-Reply-To: <20210921053356.1705833-1-alexandre.ghiti@canonical.com>

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
>

  reply	other threads:[~2021-09-21 10:17 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-21  5:33 Alexandre Ghiti
2021-09-21 10:16 ` Anup Patel [this message]
2021-09-21 11:20   ` Alexandre Ghiti
2021-09-21 10:25 ` Ben Dooks
2021-09-21 11:33   ` Alexandre Ghiti
2021-09-23 13:16     ` Alexandre Ghiti
2021-09-24 15:04 ` Adam Thomson
2021-09-24 16:17   ` Alexandre Ghiti
2021-09-29 13:33     ` Adam Thomson
2021-09-30  7:51       ` David Abdurachmanov
2021-09-30  9:28         ` Adam Thomson
2021-09-30 10:25         ` Alexandre Ghiti
2021-10-04 12:05           ` Alexandre Ghiti
2021-10-04 15:11             ` Adam Thomson
2021-10-05 13:43               ` Alexandre Ghiti
2021-10-06  9:30                 ` Adam Thomson
2021-10-06 11:35                   ` Alexandre Ghiti
2021-10-08  9:46                     ` Adam Thomson
2021-10-12 10:32                       ` Adam Thomson
2021-10-14 15:51                         ` Alexandre Ghiti
2021-10-15  8:47                           ` Adam Thomson
2021-09-30  9:37       ` Alexandre Ghiti
2021-09-30 10:47         ` Adam Thomson
2021-09-30  9:55       ` Alexandre Ghiti
2021-10-04 15:29         ` Adam Thomson

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