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Message-ID: <20220726084518.qmb2wjcazi3djcqr@pengutronix.de>
Date: Tue, 26 Jul 2022 10:45:18 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: p.zabel@...gutronix.de, robh+dt@...nel.org, krzk+dt@...nel.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel@...gutronix.de
Subject: Re: [PATCH v2 2/2] reset: tps380x: Add TPS380x device driver supprt
Hi Philipp,
gentle ping.
On 22-05-30, Marco Felsch wrote:
> The TI TPS380x family [1] is a voltage 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@...gutronix.de>
> ---
> Changelog:
> v2:
> - make reset_tps380x_ops static
> - fix commit message typo
>
> 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..088158f54e6f
> --- /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@...gutronix.de>
> + *
> + * Based on Simple Reset Controller Driver
> + *
> + * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@...gutronix.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");
> +
> + /*
> + * Todo:
> + * Add firmware handling to switch between min/typ/max reset time
> + */
> + 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@...gutronix.de>");
> +MODULE_DESCRIPTION("TI TPS380x Supply Voltags Supervisor and Reset Driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.30.2
>
>
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