Unverified Commit 6cf3c0f8 authored by Ji Sheng Teoh's avatar Ji Sheng Teoh Committed by Mark Brown
Browse files

spi: spi-cadence: Add optional reset control support 



Add optional reset control support for spi-cadence to properly bring
the SPI device into an operating condition.

Co-developed-by: default avatarEng Lee Teh <englee.teh@starfivetech.com>
Signed-off-by: default avatarEng Lee Teh <englee.teh@starfivetech.com>
Co-developed-by: default avatarLey Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: default avatarLey Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: default avatarJi Sheng Teoh <jisheng.teoh@starfivetech.com>
Link: https://msgid.link/r/20240508054728.1751162-2-jisheng.teoh@starfivetech.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f44b3730

drivers/spi/spi-cadence.c

+13 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/reset.h>

#include <linux/spi/spi.h>



/* Name of this driver */
@@ -111,6 +112,7 @@ 
 * @dev_busy:		Device busy flag

 * @is_decoded_cs:	Flag for decoder property set or not

 * @tx_fifo_depth:	Depth of the TX FIFO

 * @rstc:		Optional reset control for SPI controller

 */

struct cdns_spi {

	void __iomem *regs;
@@ -125,6 +127,7 @@ struct cdns_spi { 
	u8 dev_busy;

	u32 is_decoded_cs;

	unsigned int tx_fifo_depth;

	struct reset_control *rstc;

};



/* Macros for the SPI controller read/write */
@@ -588,6 +591,16 @@ static int cdns_spi_probe(struct platform_device *pdev) 
		goto remove_ctlr;

	}



	xspi->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, "spi");

	if (IS_ERR(xspi->rstc)) {

		ret = dev_err_probe(&pdev->dev, PTR_ERR(xspi->rstc),

				    "Cannot get SPI reset.\n");

		goto remove_ctlr;

	}



	reset_control_assert(xspi->rstc);

	reset_control_deassert(xspi->rstc);



	if (!spi_controller_is_target(ctlr)) {

		xspi->ref_clk = devm_clk_get_enabled(&pdev->dev, "ref_clk");

		if (IS_ERR(xspi->ref_clk)) {