spi: spi-fsl-dspi: Adding shutdown hook

// SPDX-License-Identifier: GPL-2.0+

//

// Copyright 2013 Freescale Semiconductor, Inc.

// Copyright 2020 NXP

//

// Freescale DSPI driver

// This file contains a driver for the Freescale DSPI

#define SPI_MCR_CLR_TXF			BIT(11)

#define SPI_MCR_CLR_RXF			BIT(10)

#define SPI_MCR_XSPI			BIT(3)

#define SPI_MCR_DIS_TXF			BIT(13)

#define SPI_MCR_DIS_RXF			BIT(12)

#define SPI_MCR_HALT			BIT(0)

#define SPI_TCR				0x08

#define SPI_TCR_GET_TCNT(x)		(((x) & GENMASK(31, 16)) >> 16)

	return 0;

}

static void dspi_shutdown(struct platform_device *pdev)

{

	struct spi_controller *ctlr = platform_get_drvdata(pdev);

	struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);

	/* Disable RX and TX */

	regmap_update_bits(dspi->regmap, SPI_MCR,

			   SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF,

			   SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF);

	/* Stop Running */

	regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_HALT, SPI_MCR_HALT);

	dspi_release_dma(dspi);

	clk_disable_unprepare(dspi->clk);

	spi_unregister_controller(dspi->ctlr);

}

static struct platform_driver fsl_dspi_driver = {

	.driver.name		= DRIVER_NAME,

	.driver.of_match_table	= fsl_dspi_dt_ids,

	.driver.pm		= &dspi_pm,

	.probe			= dspi_probe,

	.remove			= dspi_remove,

	.shutdown		= dspi_shutdown,

};

module_platform_driver(fsl_dspi_driver);