LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Sebastian Reichel <sebastian.reichel@collabora.com>
To: Emil Renner Berthing <kernel@esmil.dk>
Cc: Lee Jones <lee.jones@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/4] power: reset: Add TPS65086 restart driver
Date: Mon, 16 Aug 2021 15:13:27 +0200	[thread overview]
Message-ID: <20210816131327.4s3vaafsaohexgmw@earth.universe> (raw)
In-Reply-To: <20210727092554.1059305-4-kernel@esmil.dk>

[-- Attachment #1: Type: text/plain, Size: 5251 bytes --]

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@esmil.dk>
> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.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@esmil.dk>");
> +MODULE_DESCRIPTION("TPS65086 restart driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.32.0
> 

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

  reply	other threads:[~2021-08-16 13:24 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27  9:25 [PATCH v2 0/4] BeagleV Starlight reset support Emil Renner Berthing
2021-07-27  9:25 ` [PATCH v2 1/4] dt-bindings: mfd: convert tps65086.txt to YAML Emil Renner Berthing
2021-08-02 19:43   ` Rob Herring
2021-08-16 12:40   ` Lee Jones
2021-07-27  9:25 ` [PATCH v2 2/4] mfd: tps65086: Make interrupt line optional Emil Renner Berthing
2021-08-16 12:40   ` Lee Jones
2021-07-27  9:25 ` [PATCH v2 3/4] power: reset: Add TPS65086 restart driver Emil Renner Berthing
2021-08-16 13:13   ` Sebastian Reichel [this message]
2021-07-27  9:25 ` [PATCH v2 4/4] mfd: tps65086: Add cell entry for reset driver Emil Renner Berthing
2021-08-16 12:41   ` Lee Jones

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210816131327.4s3vaafsaohexgmw@earth.universe \
    --to=sebastian.reichel@collabora.com \
    --cc=devicetree@vger.kernel.org \
    --cc=kernel@esmil.dk \
    --cc=lee.jones@linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=robh+dt@kernel.org \
    --subject='Re: [PATCH v2 3/4] power: reset: Add TPS65086 restart driver' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).