On 25/05/2022 16:20, Marco Felsch wrote: > The TI TPS380x family [1] is a volatage supervisor with a dedicated > manual reset (mr) line input and a reset output. The chip(s) have a > build in reset delay, depending on the chip partnumber. This simple > driver addresses this so the cosumer don't need to care about it. > > [1] https://www.ti.com/product/TPS3801 > > Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx> > --- > drivers/reset/Kconfig | 8 +++ > drivers/reset/Makefile | 1 + > drivers/reset/reset-tps380x.c | 130 ++++++++++++++++++++++++++++++++++ > 3 files changed, 139 insertions(+) > create mode 100644 drivers/reset/reset-tps380x.c > > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig > index e0fc80e041ea..e2eb616af812 100644 > --- a/drivers/reset/Kconfig > +++ b/drivers/reset/Kconfig > @@ -256,6 +256,14 @@ config RESET_TI_SYSCON > you wish to use the reset framework for such memory-mapped devices, > say Y here. Otherwise, say N. > > +config RESET_TI_TPS380X > + tristate "TI TPS380x Reset Driver" > + select GPIOLIB > + help > + This enables the reset driver support for TI TPS380x devices. If > + you wish to use the reset framework for such devices, say Y here. > + Otherwise, say N. > + > config RESET_TN48M_CPLD > tristate "Delta Networks TN48M switch CPLD reset controller" > depends on MFD_TN48M_CPLD || COMPILE_TEST > diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile > index a80a9c4008a7..66399b92b1bb 100644 > --- a/drivers/reset/Makefile > +++ b/drivers/reset/Makefile > @@ -33,6 +33,7 @@ obj-$(CONFIG_RESET_STARFIVE_JH7100) += reset-starfive-jh7100.o > obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o > obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o > obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o > +obj-$(CONFIG_RESET_TI_TPS380X) += reset-tps380x.o > obj-$(CONFIG_RESET_TN48M_CPLD) += reset-tn48m.o > obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o > obj-$(CONFIG_RESET_UNIPHIER_GLUE) += reset-uniphier-glue.o > diff --git a/drivers/reset/reset-tps380x.c b/drivers/reset/reset-tps380x.c > new file mode 100644 > index 000000000000..fd2c0929ae2d > --- /dev/null > +++ b/drivers/reset/reset-tps380x.c > @@ -0,0 +1,130 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * TI TPS380x Supply Voltage Supervisor and Reset Controller Driver > + * > + * Copyright (C) 2022 Pengutronix, Marco Felsch <kernel@xxxxxxxxxxxxxx> > + * > + * Based on Simple Reset Controller Driver > + * > + * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@xxxxxxxxxxxxxx> > + */ > + > +#include <linux/delay.h> > +#include <linux/gpio/consumer.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/property.h> > +#include <linux/reset-controller.h> > + > +struct tps380x_reset { > + struct reset_controller_dev rcdev; > + struct gpio_desc *reset_gpio; > + unsigned int reset_ms; > +}; > + > +struct tps380x_reset_devdata { > + unsigned int min_reset_ms; > + unsigned int typ_reset_ms; > + unsigned int max_reset_ms; > +}; > + > +static inline > +struct tps380x_reset *to_tps380x_reset(struct reset_controller_dev *rcdev) > +{ > + return container_of(rcdev, struct tps380x_reset, rcdev); > +} > + > +static int > +tps380x_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) > +{ > + struct tps380x_reset *tps380x = to_tps380x_reset(rcdev); > + > + gpiod_set_value_cansleep(tps380x->reset_gpio, 1); > + > + return 0; > +} > + > +static int > +tps380x_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) > +{ > + struct tps380x_reset *tps380x = to_tps380x_reset(rcdev); > + > + gpiod_set_value_cansleep(tps380x->reset_gpio, 0); > + msleep(tps380x->reset_ms); > + > + return 0; > +} > + > +const struct reset_control_ops reset_tps380x_ops = { This looks static. Best regards, Krzysztof
