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spi: fsl-qspi: add optional reset support

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Add support for one or more optional exclusive resets.  These simply need
to be deasserted at probe time, and can remain that way for the life of the
device.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Alex Elder <elder@riscstar.com>
Link: https://patch.msgid.link/20251027133008.360237-4-elder@riscstar.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alex Elder 2025-10-27 08:30:01 -05:00 committed by Mark Brown
parent 873a461414
commit 106d7641e5
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GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
drivers/spi/spi-fsl-qspi.c
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@ -36,6 +36,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/reset.h>
#include <linux/sizes.h>
#include <linux/spi/spi.h>
@ -267,6 +268,7 @@ struct fsl_qspi {
const struct fsl_qspi_devtype_data *devtype_data;
struct mutex lock;
struct completion c;
struct reset_control *resets;
struct clk *clk, *clk_en;
struct pm_qos_request pm_qos_req;
struct device *dev;
@ -857,6 +859,8 @@ static void fsl_qspi_cleanup(void *data)
{
struct fsl_qspi *q = data;
reset_control_assert(q->resets);
fsl_qspi_clk_disable_unprep(q);
mutex_destroy(&q->lock);
@ -902,6 +906,10 @@ static int fsl_qspi_probe(struct platform_device *pdev)
if (!q->ahb_addr)
return -ENOMEM;
q->resets = devm_reset_control_array_get_optional_exclusive(dev);
if (IS_ERR(q->resets))
return PTR_ERR(q->resets);
/* find the clocks */
q->clk_en = devm_clk_get(dev, "qspi_en");
if (IS_ERR(q->clk_en))
@ -923,6 +931,10 @@ static int fsl_qspi_probe(struct platform_device *pdev)
if (ret)
return ret;
ret = reset_control_deassert(q->resets);
if (ret)
return ret;
/* find the irq */
ret = platform_get_irq(pdev, 0);
if (ret < 0)