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    SubjectRe: [PATCH 13/43] power: reset: Add a driver for the ep93xx reset
    Hi,

    On Mon, Apr 24, 2023 at 03:34:29PM +0300, Nikita Shubin wrote:
    > Implement the reset behaviour of the various EP93xx SoCS in drivers/power/reset.
    >
    > It used to be located in arch/arm/mach-ep93xx.
    >
    > Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
    > ---

    Acked-by: Sebastian Reichel <sre@kernel.org>

    -- Sebastian

    > drivers/power/reset/Kconfig | 10 +++++
    > drivers/power/reset/Makefile | 1 +
    > drivers/power/reset/ep93xx-restart.c | 65 ++++++++++++++++++++++++++++
    > 3 files changed, 76 insertions(+)
    > create mode 100644 drivers/power/reset/ep93xx-restart.c
    >
    > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
    > index 8c87eeda0fec..2a61afbb047b 100644
    > --- a/drivers/power/reset/Kconfig
    > +++ b/drivers/power/reset/Kconfig
    > @@ -75,6 +75,16 @@ config POWER_RESET_BRCMSTB
    > Say Y here if you have a Broadcom STB board and you wish
    > to have restart support.
    >
    > +config POWER_RESET_EP93XX
    > + bool "Cirrus EP93XX reset driver" if COMPILE_TEST
    > + depends on MFD_SYSCON
    > + default ARCH_EP93XX
    > + help
    > + This driver provides restart support for Cirrus EP93XX SoC.
    > +
    > + Say Y here if you have a Cirrus EP93XX SoC and you wish
    > + to have restart support.
    > +
    > config POWER_RESET_GEMINI_POWEROFF
    > bool "Cortina Gemini power-off driver"
    > depends on ARCH_GEMINI || COMPILE_TEST
    > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
    > index d763e6735ee3..61f4e11619b2 100644
    > --- a/drivers/power/reset/Makefile
    > +++ b/drivers/power/reset/Makefile
    > @@ -7,6 +7,7 @@ obj-$(CONFIG_POWER_RESET_ATC260X) += atc260x-poweroff.o
    > obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
    > obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o
    > obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
    > +obj-$(CONFIG_POWER_RESET_EP93XX) += ep93xx-restart.o
    > obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o
    > obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
    > obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
    > diff --git a/drivers/power/reset/ep93xx-restart.c b/drivers/power/reset/ep93xx-restart.c
    > new file mode 100644
    > index 000000000000..0dab09d4fd3c
    > --- /dev/null
    > +++ b/drivers/power/reset/ep93xx-restart.c
    > @@ -0,0 +1,65 @@
    > +// SPDX-License-Identifier: (GPL-2.0)
    > +/*
    > + * Cirrus EP93xx SoC reset driver
    > + *
    > + * Copyright (C) 2021 Nikita Shubin <nikita.shubin@maquefel.me>
    > + */
    > +
    > +#include <linux/delay.h>
    > +#include <linux/notifier.h>
    > +#include <linux/of_device.h>
    > +#include <linux/platform_device.h>
    > +#include <linux/reboot.h>
    > +
    > +#include <linux/soc/cirrus/ep93xx.h>
    > +
    > +#define EP93XX_SYSCON_DEVCFG_SWRST BIT(31)
    > +
    > +static int ep93xx_restart_handle(struct notifier_block *this,
    > + unsigned long mode, void *cmd)
    > +{
    > + /* Issue the reboot */
    > + ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_SWRST, 0x00);
    > + ep93xx_devcfg_set_clear(0x00, EP93XX_SYSCON_DEVCFG_SWRST);
    > +
    > + mdelay(1000);
    > +
    > + pr_emerg("Unable to restart system\n");
    > + return NOTIFY_DONE;
    > +}
    > +
    > +static int ep93xx_reboot_probe(struct platform_device *pdev)
    > +{
    > + struct notifier_block *res_han;
    > + struct device *dev = &pdev->dev;
    > + int err;
    > +
    > + res_han = devm_kzalloc(&pdev->dev, sizeof(*res_han), GFP_KERNEL);
    > + if (!res_han)
    > + return -ENOMEM;
    > +
    > + res_han->notifier_call = ep93xx_restart_handle;
    > + res_han->priority = 128;
    > +
    > + err = register_restart_handler(res_han);
    > + if (err)
    > + dev_err(dev, "can't register restart notifier (err=%d)\n", err);
    > +
    > + return err;
    > +}
    > +
    > +static const struct of_device_id ep93xx_reboot_of_match[] = {
    > + {
    > + .compatible = "cirrus,ep9301-reboot",
    > + },
    > + {}
    > +};
    > +
    > +static struct platform_driver ep93xx_reboot_driver = {
    > + .probe = ep93xx_reboot_probe,
    > + .driver = {
    > + .name = "ep9301-reboot",
    > + .of_match_table = ep93xx_reboot_of_match,
    > + },
    > +};
    > +builtin_platform_driver(ep93xx_reboot_driver);
    > --
    > 2.39.2
    >
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