From b3dcb5de62092406bea6d5d03e32824d823fcd39 Mon Sep 17 00:00:00 2001 From: Robert Marko Date: Mon, 31 Jan 2022 14:30:45 +0100 Subject: gpio: Add Delta TN48M CPLD GPIO driver Delta TN48M switch has an onboard Lattice CPLD that is used as a GPIO expander. The CPLD provides 12 pins in total on the TN48M, but on more advanced switch models it provides up to 192 pins, so the driver is extendable to support more switches. Reviewed-by: Andy Shevchenko Reviewed-by: Michael Walle Reviewed-by: Linus Walleij Acked-by: Bartosz Golaszewski Signed-off-by: Robert Marko Link: https://lore.kernel.org/r/20220131133049.77780-3-robert.marko@sartura.hr Signed-off-by: Greg Kroah-Hartman --- drivers/gpio/Kconfig | 12 ++++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-tn48m.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 113 insertions(+) create mode 100644 drivers/gpio/gpio-tn48m.c (limited to 'drivers/gpio') diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 1c211b4c63be..c822cf6146cf 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1346,6 +1346,18 @@ config GPIO_TIMBERDALE help Add support for the GPIO IP in the timberdale FPGA. +config GPIO_TN48M_CPLD + tristate "Delta Networks TN48M switch CPLD GPIO driver" + depends on MFD_TN48M_CPLD + select GPIO_REGMAP + help + This enables support for the GPIOs found on the Delta + Networks TN48M switch Lattice CPLD. It provides 12 pins in total, + they are input-only or output-only type. + + This driver can also be built as a module. If so, the + module will be called gpio-tn48m. + config GPIO_TPS65086 tristate "TI TPS65086 GPO" depends on MFD_TPS65086 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index edbaa3cb343c..3b68a9808154 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -148,6 +148,7 @@ obj-$(CONFIG_GPIO_TEGRA186) += gpio-tegra186.o obj-$(CONFIG_GPIO_TEGRA) += gpio-tegra.o obj-$(CONFIG_GPIO_THUNDERX) += gpio-thunderx.o obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o +obj-$(CONFIG_GPIO_TN48M_CPLD) += gpio-tn48m.o obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o obj-$(CONFIG_GPIO_TPS65086) += gpio-tps65086.o obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o diff --git a/drivers/gpio/gpio-tn48m.c b/drivers/gpio/gpio-tn48m.c new file mode 100644 index 000000000000..cd4a80b22794 --- /dev/null +++ b/drivers/gpio/gpio-tn48m.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Delta TN48M CPLD GPIO driver + * + * Copyright (C) 2021 Sartura Ltd. + * + * Author: Robert Marko + */ + +#include +#include +#include +#include +#include +#include +#include + +enum tn48m_gpio_type { + TN48M_GP0 = 1, + TN48M_GPI, +}; + +struct tn48m_gpio_config { + int ngpio; + int ngpio_per_reg; + enum tn48m_gpio_type type; +}; + +static const struct tn48m_gpio_config tn48m_gpo_config = { + .ngpio = 4, + .ngpio_per_reg = 4, + .type = TN48M_GP0, +}; + +static const struct tn48m_gpio_config tn48m_gpi_config = { + .ngpio = 4, + .ngpio_per_reg = 4, + .type = TN48M_GPI, +}; + +static int tn48m_gpio_probe(struct platform_device *pdev) +{ + const struct tn48m_gpio_config *gpio_config; + struct gpio_regmap_config config = {}; + struct regmap *regmap; + u32 base; + int ret; + + if (!pdev->dev.parent) + return -ENODEV; + + gpio_config = device_get_match_data(&pdev->dev); + if (!gpio_config) + return -ENODEV; + + ret = device_property_read_u32(&pdev->dev, "reg", &base); + if (ret) + return ret; + + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!regmap) + return -ENODEV; + + config.regmap = regmap; + config.parent = &pdev->dev; + config.ngpio = gpio_config->ngpio; + config.ngpio_per_reg = gpio_config->ngpio_per_reg; + switch (gpio_config->type) { + case TN48M_GP0: + config.reg_set_base = base; + break; + case TN48M_GPI: + config.reg_dat_base = base; + break; + default: + return -EINVAL; + } + + return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config)); +} + +static const struct of_device_id tn48m_gpio_of_match[] = { + { .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config }, + { .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config }, + { } +}; +MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match); + +static struct platform_driver tn48m_gpio_driver = { + .driver = { + .name = "delta-tn48m-gpio", + .of_match_table = tn48m_gpio_of_match, + }, + .probe = tn48m_gpio_probe, +}; +module_platform_driver(tn48m_gpio_driver); + +MODULE_AUTHOR("Robert Marko "); +MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3