This driver registers a pm_power_off function to turn off the board
by force-disabling a devicetree-defined regulator.
Signed-off-by: Michael Klein <[email protected]>
---
drivers/power/reset/Kconfig | 7 ++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/regulator-poweroff.c | 82 ++++++++++++++++++++++++
3 files changed, 90 insertions(+)
create mode 100644 drivers/power/reset/regulator-poweroff.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index d55b3727e00e..b22c4fdb2561 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -177,6 +177,13 @@ config POWER_RESET_QNAP
Say Y if you have a QNAP NAS.
+config POWER_RESET_REGULATOR
+ bool "Regulator subsystem power-off driver"
+ depends on OF && REGULATOR
+ help
+ This driver supports turning off your board by disabling a
+ power regulator defined in the devicetree.
+
config POWER_RESET_RESTART
bool "Restart power-off driver"
help
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index c51eceba9ea3..9dc49d3a57ff 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
obj-$(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_VERSATILE) += arm-versatile-reboot.o
diff --git a/drivers/power/reset/regulator-poweroff.c b/drivers/power/reset/regulator-poweroff.c
new file mode 100644
index 000000000000..f697088e0ad1
--- /dev/null
+++ b/drivers/power/reset/regulator-poweroff.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Force-disables a regulator to power down a device
+ *
+ * Michael Klein <[email protected]>
+ *
+ * Copyright (C) 2020 Michael Klein
+ *
+ * Based on the gpio-poweroff driver.
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#define TIMEOUT_MS 3000
+
+/*
+ * Hold configuration here, cannot be more than one instance of the driver
+ * since pm_power_off itself is global.
+ */
+static struct regulator *cpu_regulator;
+
+static void regulator_poweroff_do_poweroff(void)
+{
+ if (cpu_regulator && regulator_is_enabled(cpu_regulator))
+ regulator_force_disable(cpu_regulator);
+
+ /* give it some time */
+ mdelay(TIMEOUT_MS);
+
+ WARN_ON(1);
+}
+
+static int regulator_poweroff_probe(struct platform_device *pdev)
+{
+ /* If a pm_power_off function has already been added, leave it alone */
+ if (pm_power_off != NULL) {
+ dev_err(&pdev->dev,
+ "%s: pm_power_off function already registered\n",
+ __func__);
+ return -EBUSY;
+ }
+
+ cpu_regulator = devm_regulator_get(&pdev->dev, "cpu");
+ if (IS_ERR(cpu_regulator))
+ return PTR_ERR(cpu_regulator);
+
+ pm_power_off = ®ulator_poweroff_do_poweroff;
+ return 0;
+}
+
+static int regulator_poweroff_remove(__maybe_unused struct platform_device *pdev)
+{
+ if (pm_power_off == ®ulator_poweroff_do_poweroff)
+ pm_power_off = NULL;
+
+ return 0;
+}
+
+static const struct of_device_id of_regulator_poweroff_match[] = {
+ { .compatible = "regulator-poweroff", },
+ {},
+};
+
+static struct platform_driver regulator_poweroff_driver = {
+ .probe = regulator_poweroff_probe,
+ .remove = regulator_poweroff_remove,
+ .driver = {
+ .name = "poweroff-regulator",
+ .of_match_table = of_regulator_poweroff_match,
+ },
+};
+
+module_platform_driver(regulator_poweroff_driver);
+
+MODULE_AUTHOR("Michael Klein <[email protected]>");
+MODULE_DESCRIPTION("Regulator poweroff driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:poweroff-regulator");
--
2.29.2
Hi,
On Fri, Dec 11, 2020 at 04:14:43PM +0100, Michael Klein wrote:
> This driver registers a pm_power_off function to turn off the board
> by force-disabling a devicetree-defined regulator.
>
> Signed-off-by: Michael Klein <[email protected]>
> ---
Thanks, queued.
-- Sebastian
> drivers/power/reset/Kconfig | 7 ++
> drivers/power/reset/Makefile | 1 +
> drivers/power/reset/regulator-poweroff.c | 82 ++++++++++++++++++++++++
> 3 files changed, 90 insertions(+)
> create mode 100644 drivers/power/reset/regulator-poweroff.c
>
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index d55b3727e00e..b22c4fdb2561 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -177,6 +177,13 @@ config POWER_RESET_QNAP
>
> Say Y if you have a QNAP NAS.
>
> +config POWER_RESET_REGULATOR
> + bool "Regulator subsystem power-off driver"
> + depends on OF && REGULATOR
> + help
> + This driver supports turning off your board by disabling a
> + power regulator defined in the devicetree.
> +
> config POWER_RESET_RESTART
> bool "Restart power-off driver"
> help
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index c51eceba9ea3..9dc49d3a57ff 100644
> --- a/drivers/power/reset/Makefile
> +++ b/drivers/power/reset/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
> obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
> obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
> obj-$(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_VERSATILE) += arm-versatile-reboot.o
> diff --git a/drivers/power/reset/regulator-poweroff.c b/drivers/power/reset/regulator-poweroff.c
> new file mode 100644
> index 000000000000..f697088e0ad1
> --- /dev/null
> +++ b/drivers/power/reset/regulator-poweroff.c
> @@ -0,0 +1,82 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Force-disables a regulator to power down a device
> + *
> + * Michael Klein <[email protected]>
> + *
> + * Copyright (C) 2020 Michael Klein
> + *
> + * Based on the gpio-poweroff driver.
> + */
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/regulator/consumer.h>
> +
> +#define TIMEOUT_MS 3000
> +
> +/*
> + * Hold configuration here, cannot be more than one instance of the driver
> + * since pm_power_off itself is global.
> + */
> +static struct regulator *cpu_regulator;
> +
> +static void regulator_poweroff_do_poweroff(void)
> +{
> + if (cpu_regulator && regulator_is_enabled(cpu_regulator))
> + regulator_force_disable(cpu_regulator);
> +
> + /* give it some time */
> + mdelay(TIMEOUT_MS);
> +
> + WARN_ON(1);
> +}
> +
> +static int regulator_poweroff_probe(struct platform_device *pdev)
> +{
> + /* If a pm_power_off function has already been added, leave it alone */
> + if (pm_power_off != NULL) {
> + dev_err(&pdev->dev,
> + "%s: pm_power_off function already registered\n",
> + __func__);
> + return -EBUSY;
> + }
> +
> + cpu_regulator = devm_regulator_get(&pdev->dev, "cpu");
> + if (IS_ERR(cpu_regulator))
> + return PTR_ERR(cpu_regulator);
> +
> + pm_power_off = ®ulator_poweroff_do_poweroff;
> + return 0;
> +}
> +
> +static int regulator_poweroff_remove(__maybe_unused struct platform_device *pdev)
> +{
> + if (pm_power_off == ®ulator_poweroff_do_poweroff)
> + pm_power_off = NULL;
> +
> + return 0;
> +}
> +
> +static const struct of_device_id of_regulator_poweroff_match[] = {
> + { .compatible = "regulator-poweroff", },
> + {},
> +};
> +
> +static struct platform_driver regulator_poweroff_driver = {
> + .probe = regulator_poweroff_probe,
> + .remove = regulator_poweroff_remove,
> + .driver = {
> + .name = "poweroff-regulator",
> + .of_match_table = of_regulator_poweroff_match,
> + },
> +};
> +
> +module_platform_driver(regulator_poweroff_driver);
> +
> +MODULE_AUTHOR("Michael Klein <[email protected]>");
> +MODULE_DESCRIPTION("Regulator poweroff driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:poweroff-regulator");
> --
> 2.29.2
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Hi Sebastian,
On Sun, Dec 13, 2020 at 12:41:16AM +0100, Sebastian Reichel wrote:
> Hi,
>
> On Fri, Dec 11, 2020 at 04:14:43PM +0100, Michael Klein wrote:
> > This driver registers a pm_power_off function to turn off the board
> > by force-disabling a devicetree-defined regulator.
> >
> > Signed-off-by: Michael Klein <[email protected]>
> > ---
>
> Thanks, queued.
Did you also merge the binding?
Maxime
Hi Maxime,
On Mon, Dec 14, 2020 at 11:02:04AM +0100, Maxime Ripard wrote:
> Hi Sebastian,
>
> On Sun, Dec 13, 2020 at 12:41:16AM +0100, Sebastian Reichel wrote:
> > Hi,
> >
> > On Fri, Dec 11, 2020 at 04:14:43PM +0100, Michael Klein wrote:
> > > This driver registers a pm_power_off function to turn off the board
> > > by force-disabling a devicetree-defined regulator.
> > >
> > > Signed-off-by: Michael Klein <[email protected]>
> > > ---
> >
> > Thanks, queued.
>
> Did you also merge the binding?
Yes.
-- Sebastian