[PATCH 3/8] spi: fsl-qspi: add optional reset support

[Alex Elder <elder@riscstar.com>]

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.

Signed-off-by: Alex Elder <elder@riscstar.com>
---
 drivers/spi/spi-fsl-qspi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c
index c887abb028d77..1e27647dd2a09 100644
--- 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)
-- 
2.48.1