17d3aa342SRadu Pirea // SPDX-License-Identifier: GPL-2.0
27d3aa342SRadu Pirea /*
37d3aa342SRadu Pirea * Driver for AT91 USART
47d3aa342SRadu Pirea *
57d3aa342SRadu Pirea * Copyright (C) 2018 Microchip Technology
67d3aa342SRadu Pirea *
77d3aa342SRadu Pirea * Author: Radu Pirea <radu.pirea@microchip.com>
87d3aa342SRadu Pirea *
97d3aa342SRadu Pirea */
107d3aa342SRadu Pirea
117d3aa342SRadu Pirea #include <dt-bindings/mfd/at91-usart.h>
127d3aa342SRadu Pirea
137d3aa342SRadu Pirea #include <linux/module.h>
147d3aa342SRadu Pirea #include <linux/mfd/core.h>
1565b80dffSLee Jones #include <linux/of.h>
167d3aa342SRadu Pirea #include <linux/property.h>
177d3aa342SRadu Pirea
18*4c5840b9SCodrin Ciubotariu static const struct mfd_cell at91_usart_spi_subdev =
19*4c5840b9SCodrin Ciubotariu MFD_CELL_NAME("at91_usart_spi");
207d3aa342SRadu Pirea
21*4c5840b9SCodrin Ciubotariu static const struct mfd_cell at91_usart_serial_subdev =
22*4c5840b9SCodrin Ciubotariu MFD_CELL_NAME("atmel_usart_serial");
237d3aa342SRadu Pirea
at91_usart_mode_probe(struct platform_device * pdev)247d3aa342SRadu Pirea static int at91_usart_mode_probe(struct platform_device *pdev)
257d3aa342SRadu Pirea {
26c0056bfeSAxel Lin const struct mfd_cell *cell;
277d3aa342SRadu Pirea u32 opmode = AT91_USART_MODE_SERIAL;
287d3aa342SRadu Pirea
297d3aa342SRadu Pirea device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode);
307d3aa342SRadu Pirea
317d3aa342SRadu Pirea switch (opmode) {
327d3aa342SRadu Pirea case AT91_USART_MODE_SPI:
33c0056bfeSAxel Lin cell = &at91_usart_spi_subdev;
347d3aa342SRadu Pirea break;
357d3aa342SRadu Pirea case AT91_USART_MODE_SERIAL:
36c0056bfeSAxel Lin cell = &at91_usart_serial_subdev;
377d3aa342SRadu Pirea break;
387d3aa342SRadu Pirea default:
397d3aa342SRadu Pirea dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n",
407d3aa342SRadu Pirea opmode);
417d3aa342SRadu Pirea return -EINVAL;
427d3aa342SRadu Pirea }
437d3aa342SRadu Pirea
44c0056bfeSAxel Lin return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, cell, 1,
457d3aa342SRadu Pirea NULL, 0, NULL);
467d3aa342SRadu Pirea }
477d3aa342SRadu Pirea
487d3aa342SRadu Pirea static const struct of_device_id at91_usart_mode_of_match[] = {
497d3aa342SRadu Pirea { .compatible = "atmel,at91rm9200-usart" },
507d3aa342SRadu Pirea { .compatible = "atmel,at91sam9260-usart" },
517d3aa342SRadu Pirea { /* sentinel */ }
527d3aa342SRadu Pirea };
537d3aa342SRadu Pirea
547d3aa342SRadu Pirea MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match);
557d3aa342SRadu Pirea
567d3aa342SRadu Pirea static struct platform_driver at91_usart_mfd = {
577d3aa342SRadu Pirea .probe = at91_usart_mode_probe,
587d3aa342SRadu Pirea .driver = {
597d3aa342SRadu Pirea .name = "at91_usart_mode",
607d3aa342SRadu Pirea .of_match_table = at91_usart_mode_of_match,
617d3aa342SRadu Pirea },
627d3aa342SRadu Pirea };
637d3aa342SRadu Pirea
647d3aa342SRadu Pirea module_platform_driver(at91_usart_mfd);
657d3aa342SRadu Pirea
667d3aa342SRadu Pirea MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>");
677d3aa342SRadu Pirea MODULE_DESCRIPTION("AT91 USART MFD driver");
687d3aa342SRadu Pirea MODULE_LICENSE("GPL v2");
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