projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7d3aa342 RP |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* | |
| 3 | * Driver for AT91 USART | |
| 4 | * | |
| 5 | * Copyright (C) 2018 Microchip Technology | |
| 6 | * | |
| 7 | * Author: Radu Pirea <radu.pirea@microchip.com> | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| 11 | #include <dt-bindings/mfd/at91-usart.h> | |
| 12 | ||
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/mfd/core.h> | |
| 65b80dff | 15 | #include <linux/of.h> |
| 7d3aa342 RP |
16 | #include <linux/property.h> |
| 17 | ||
| 18 | static struct mfd_cell at91_usart_spi_subdev = { | |
| 19 | .name = "at91_usart_spi", | |
| 20 | .of_compatible = "microchip,at91sam9g45-usart-spi", | |
| 21 | }; | |
| 22 | ||
| 23 | static struct mfd_cell at91_usart_serial_subdev = { | |
| 24 | .name = "atmel_usart_serial", | |
| 25 | .of_compatible = "atmel,at91rm9200-usart-serial", | |
| 26 | }; | |
| 27 | ||
| 28 | static int at91_usart_mode_probe(struct platform_device *pdev) | |
| 29 | { | |
| 30 | struct mfd_cell cell; | |
| 31 | u32 opmode = AT91_USART_MODE_SERIAL; | |
| 32 | ||
| 33 | device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode); | |
| 34 | ||
| 35 | switch (opmode) { | |
| 36 | case AT91_USART_MODE_SPI: | |
| 37 | cell = at91_usart_spi_subdev; | |
| 38 | break; | |
| 39 | case AT91_USART_MODE_SERIAL: | |
| 40 | cell = at91_usart_serial_subdev; | |
| 41 | break; | |
| 42 | default: | |
| 43 | dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n", | |
| 44 | opmode); | |
| 45 | return -EINVAL; | |
| 46 | } | |
| 47 | ||
| 48 | return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, &cell, 1, | |
| 49 | NULL, 0, NULL); | |
| 50 | } | |
| 51 | ||
| 52 | static const struct of_device_id at91_usart_mode_of_match[] = { | |
| 53 | { .compatible = "atmel,at91rm9200-usart" }, | |
| 54 | { .compatible = "atmel,at91sam9260-usart" }, | |
| 55 | { /* sentinel */ } | |
| 56 | }; | |
| 57 | ||
| 58 | MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match); | |
| 59 | ||
| 60 | static struct platform_driver at91_usart_mfd = { | |
| 61 | .probe = at91_usart_mode_probe, | |
| 62 | .driver = { | |
| 63 | .name = "at91_usart_mode", | |
| 64 | .of_match_table = at91_usart_mode_of_match, | |
| 65 | }, | |
| 66 | }; | |
| 67 | ||
| 68 | module_platform_driver(at91_usart_mfd); | |
| 69 | ||
| 70 | MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>"); | |
| 71 | MODULE_DESCRIPTION("AT91 USART MFD driver"); | |
| 72 | MODULE_LICENSE("GPL v2"); |