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