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Date: Tue, 27 Jul 2021 11:25:53 +0200
From: Emil Renner Berthing <kernel@...il.dk>
To: Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Emil Renner Berthing <kernel@...il.dk>, devicetree@...r.kernel.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] power: reset: Add TPS65086 restart driver
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>
---
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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