// SPDX-License-Identifier: GPL-2.0 /* * Driver for AT91 USART * * Copyright (C) 2018 Microchip Technology * * Author: Radu Pirea <radu.pirea@microchip.com> * */ #include <dt-bindings/mfd/at91-usart.h> #include <linux/module.h> #include <linux/mfd/core.h> #include <linux/of.h> #include <linux/property.h> static const struct mfd_cell at91_usart_spi_subdev = { .name = "at91_usart_spi", .of_compatible = "microchip,at91sam9g45-usart-spi", }; static const struct mfd_cell at91_usart_serial_subdev = { .name = "atmel_usart_serial", .of_compatible = "atmel,at91rm9200-usart-serial", }; static int at91_usart_mode_probe(struct platform_device *pdev) { const struct mfd_cell *cell; u32 opmode = AT91_USART_MODE_SERIAL; device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode); switch (opmode) { case AT91_USART_MODE_SPI: cell = &at91_usart_spi_subdev; break; case AT91_USART_MODE_SERIAL: cell = &at91_usart_serial_subdev; break; default: dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n", opmode); return -EINVAL; } return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL); } static const struct of_device_id at91_usart_mode_of_match[] = { { .compatible = "atmel,at91rm9200-usart" }, { .compatible = "atmel,at91sam9260-usart" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match); static struct platform_driver at91_usart_mfd = { .probe = at91_usart_mode_probe, .driver = { .name = "at91_usart_mode", .of_match_table = at91_usart_mode_of_match, }, }; module_platform_driver(at91_usart_mfd); MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>"); MODULE_DESCRIPTION("AT91 USART MFD driver"); MODULE_LICENSE("GPL v2");