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    Subject[PATCH v1 14/43] power: reset: Add a driver for the ep93xx reset
    Date
    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>
    ---
    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);
    --
    2.37.4
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