spi: fsl-qspi: add optional reset support

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>

diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c
index c887abb028d7758f574587707d8328c1c0aad42b..1e27647dd2a092c540f5535cd83205a5e8e99ab1 100644 (file)
--- a/drivers/spi/spi-fsl-qspi.c
+++ b/drivers/spi/spi-fsl-qspi.c
@@ -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)