diff options
| -rw-r--r-- | Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml | 1 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/reset/ti,tps380x-reset.yaml | 49 | ||||
| -rw-r--r-- | drivers/reset/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/reset-tps380x.c | 126 |
5 files changed, 188 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml b/Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml index 86c2569ced97..731b8ce01525 100644 --- a/Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml +++ b/Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml @@ -17,6 +17,7 @@ properties: compatible: items: - enum: + - renesas,r9a07g043-usbphy-ctrl # RZ/G2UL - renesas,r9a07g044-usbphy-ctrl # RZ/G2{L,LC} - renesas,r9a07g054-usbphy-ctrl # RZ/V2L - const: renesas,rzg2l-usbphy-ctrl diff --git a/Documentation/devicetree/bindings/reset/ti,tps380x-reset.yaml b/Documentation/devicetree/bindings/reset/ti,tps380x-reset.yaml new file mode 100644 index 000000000000..afc835eda0ef --- /dev/null +++ b/Documentation/devicetree/bindings/reset/ti,tps380x-reset.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/reset/ti,tps380x-reset.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: TI TPS380x reset controller node bindings + +maintainers: + - Marco Felsch <kernel@pengutronix.de> + +description: | + The TPS380x family [1] of supervisory circuits monitor supply voltages to + provide circuit initialization and timing supervision. The devices assert a + RESET signal if the voltage drops below a preset threshold or upon a manual + reset input (MR). The RESET output remains asserted for the factory + programmed delay after the voltage return above its threshold or after the + manual reset input is released. + + [1] https://www.ti.com/product/TPS3801 + +properties: + compatible: + enum: + - ti,tps3801 + + reset-gpios: + maxItems: 1 + description: Reference to the GPIO connected to the MR pin. + + "#reset-cells": + const: 0 + +required: + - compatible + - reset-gpios + - "#reset-cells" + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + reset: reset-controller { + compatible = "ti,tps3801"; + #reset-cells = <0>; + reset-gpios = <&gpio3 2 GPIO_ACTIVE_LOW>; + }; +... diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 93c8d07ee328..9b0a0263a005 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -17,7 +17,7 @@ if RESET_CONTROLLER config RESET_A10SR tristate "Altera Arria10 System Resource Reset" - depends on MFD_ALTERA_A10SR + depends on MFD_ALTERA_A10SR || COMPILE_TEST help This option enables support for the external reset functions for peripheral PHYs on the Altera Arria10 System Resource Chip. @@ -200,8 +200,9 @@ config RESET_SCMI firmware controlling all the reset signals. config RESET_SIMPLE - bool "Simple Reset Controller Driver" if COMPILE_TEST + bool "Simple Reset Controller Driver" if COMPILE_TEST || EXPERT default ARCH_ASPEED || ARCH_BCM4908 || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || (ARCH_INTEL_SOCFPGA && ARM64) || ARCH_SUNXI || ARC + depends on HAS_IOMEM help This enables a simple reset controller driver for reset lines that that can be asserted and deasserted by toggling bits in a contiguous, @@ -256,6 +257,14 @@ 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..09d511f069ba --- /dev/null +++ b/drivers/reset/reset-tps380x.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * TI TPS380x Supply Voltage Supervisor and Reset Controller Driver + * + * Copyright (C) 2022 Pengutronix, Marco Felsch <kernel@pengutronix.de> + * + * Based on Simple Reset Controller Driver + * + * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de> + */ + +#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; +} + +static const struct reset_control_ops reset_tps380x_ops = { + .assert = tps380x_reset_assert, + .deassert = tps380x_reset_deassert, +}; + +static int tps380x_reset_of_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + /* No special handling needed, we have only one reset line per device */ + return 0; +} + +static int tps380x_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct tps380x_reset_devdata *devdata; + struct tps380x_reset *tps380x; + + devdata = device_get_match_data(dev); + if (!devdata) + return -EINVAL; + + tps380x = devm_kzalloc(dev, sizeof(*tps380x), GFP_KERNEL); + if (!tps380x) + return -ENOMEM; + + tps380x->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(tps380x->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(tps380x->reset_gpio), + "Failed to get GPIO\n"); + + tps380x->reset_ms = devdata->max_reset_ms; + + tps380x->rcdev.ops = &reset_tps380x_ops; + tps380x->rcdev.owner = THIS_MODULE; + tps380x->rcdev.dev = dev; + tps380x->rcdev.of_node = dev->of_node; + tps380x->rcdev.of_reset_n_cells = 0; + tps380x->rcdev.of_xlate = tps380x_reset_of_xlate; + tps380x->rcdev.nr_resets = 1; + + return devm_reset_controller_register(dev, &tps380x->rcdev); +} + +static const struct tps380x_reset_devdata tps3801_reset_data = { + .min_reset_ms = 120, + .typ_reset_ms = 200, + .max_reset_ms = 280, +}; + +static const struct of_device_id tps380x_reset_dt_ids[] = { + { .compatible = "ti,tps3801", .data = &tps3801_reset_data }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, tps380x_reset_dt_ids); + +static struct platform_driver tps380x_reset_driver = { + .probe = tps380x_reset_probe, + .driver = { + .name = "tps380x-reset", + .of_match_table = tps380x_reset_dt_ids, + }, +}; +module_platform_driver(tps380x_reset_driver); + +MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>"); +MODULE_DESCRIPTION("TI TPS380x Supply Voltage Supervisor and Reset Driver"); +MODULE_LICENSE("GPL v2"); |