123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172 |
- // 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");
|