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There are no separate serial/SPI devices under the at91-usart MFD, but actually the MFD is used as a serial or a SPI device. There are no DT sub-nodes for the MFD children, so we should use platform device API to register the drivers. Suggested-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
// 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 <radu.pirea@microchip.com>
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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 <radu.pirea@microchip.com>");
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MODULE_DESCRIPTION("AT91 USART MFD driver");
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MODULE_LICENSE("GPL v2");
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