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Message-ID: <20210816131327.4s3vaafsaohexgmw@earth.universe>
Date: Mon, 16 Aug 2021 15:13:27 +0200
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Emil Renner Berthing <kernel@...il.dk>
Cc: Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] power: reset: Add TPS65086 restart driver
Hi,
On Tue, Jul 27, 2021 at 11:25:53AM +0200, Emil Renner Berthing wrote:
> The only way to reset the BeagleV Starlight v0.9 board[1] properly is to
> tell the PMIC to reset itself which will then assert the external reset
> lines of the SoC, USB hub and ethernet phy.
>
> This adds a driver to register a reset handler to do just that.
>
> [1] https://github.com/beagleboard/beaglev-starlight
>
> Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
> Acked-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
Thanks, queued.
-- Sebastian
> drivers/power/reset/Kconfig | 6 ++
> drivers/power/reset/Makefile | 1 +
> drivers/power/reset/tps65086-restart.c | 98 ++++++++++++++++++++++++++
> 3 files changed, 105 insertions(+)
> create mode 100644 drivers/power/reset/tps65086-restart.c
>
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index 4d1192062508..4b563db3ab3e 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -204,6 +204,12 @@ config POWER_RESET_ST
> help
> Reset support for STMicroelectronics boards.
>
> +config POWER_RESET_TPS65086
> + bool "TPS65086 restart driver"
> + depends on MFD_TPS65086
> + help
> + This driver adds support for resetting the TPS65086 PMIC on restart.
> +
> config POWER_RESET_VERSATILE
> bool "ARM Versatile family reboot driver"
> depends on ARM
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index cf3f4d02d8a5..f606a2f60539 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-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o
> obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o
> obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o
> obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o
> diff --git a/drivers/power/reset/tps65086-restart.c b/drivers/power/reset/tps65086-restart.c
> new file mode 100644
> index 000000000000..78b89f745a3d
> --- /dev/null
> +++ b/drivers/power/reset/tps65086-restart.c
> @@ -0,0 +1,98 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2021 Emil Renner Berthing
> + */
> +
> +#include <linux/mfd/tps65086.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +
> +struct tps65086_restart {
> + struct notifier_block handler;
> + struct device *dev;
> +};
> +
> +static int tps65086_restart_notify(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + struct tps65086_restart *tps65086_restart =
> + container_of(this, struct tps65086_restart, handler);
> + struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent);
> + int ret;
> +
> + ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1);
> + if (ret) {
> + dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n",
> + __func__, ret);
> + return NOTIFY_DONE;
> + }
> +
> + /* give it a little time */
> + mdelay(200);
> +
> + WARN_ON(1);
> +
> + return NOTIFY_DONE;
> +}
> +
> +static int tps65086_restart_probe(struct platform_device *pdev)
> +{
> + struct tps65086_restart *tps65086_restart;
> + int ret;
> +
> + tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL);
> + if (!tps65086_restart)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, tps65086_restart);
> +
> + tps65086_restart->handler.notifier_call = tps65086_restart_notify;
> + tps65086_restart->handler.priority = 192;
> + tps65086_restart->dev = &pdev->dev;
> +
> + ret = register_restart_handler(&tps65086_restart->handler);
> + if (ret) {
> + dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n",
> + __func__, ret);
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static int tps65086_restart_remove(struct platform_device *pdev)
> +{
> + struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev);
> + int ret;
> +
> + ret = unregister_restart_handler(&tps65086_restart->handler);
> + if (ret) {
> + dev_err(&pdev->dev, "%s: cannot unregister restart handler: %d\n",
> + __func__, ret);
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id tps65086_restart_id_table[] = {
> + { "tps65086-reset", },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
> +
> +static struct platform_driver tps65086_restart_driver = {
> + .driver = {
> + .name = "tps65086-restart",
> + },
> + .probe = tps65086_restart_probe,
> + .remove = tps65086_restart_remove,
> + .id_table = tps65086_restart_id_table,
> +};
> +module_platform_driver(tps65086_restart_driver);
> +
> +MODULE_AUTHOR("Emil Renner Berthing <kernel@...il.dk>");
> +MODULE_DESCRIPTION("TPS65086 restart driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.32.0
>
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