[U-Boot] [PATCH v4 8/9] spi: cadence_qspi: add reset handling

[Simon Goldschmidt]

This adds reset handling to the cadence qspi driver.

For backwards compatibility, only a warning is printed when failing to
get reset handles.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---

Changes in v4: None
Changes in v3:
- add DM_FLAG_OS_PREPARE flag

Changes in v2:
- add .remove callback to release the resets

 drivers/spi/cadence_qspi.c | 17 +++++++++++++++++
 drivers/spi/cadence_qspi.h |  4 ++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index 11fce9c4fe..c0735d6ef4 100644
--- a/drivers/spi/cadence_qspi.c
+++ b/drivers/spi/cadence_qspi.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <fdtdec.h>
 #include <malloc.h>
+#include <reset.h>
 #include <spi.h>
 #include <linux/errno.h>
 #include "cadence_qspi.h"
@@ -154,10 +155,17 @@ static int cadence_spi_probe(struct udevice *bus)
 {
 	struct cadence_spi_platdata *plat = bus->platdata;
 	struct cadence_spi_priv *priv = dev_get_priv(bus);
+	int ret;
 
 	priv->regbase = plat->regbase;
 	priv->ahbbase = plat->ahbbase;
 
+	ret = reset_get_bulk(bus, &priv->resets);
+	if (ret)
+		dev_warn(bus, "Can't get reset: %d\n", ret);
+	else
+		reset_deassert_bulk(&priv->resets);
+
 	if (!priv->qspi_is_init) {
 		cadence_qspi_apb_controller_init(plat);
 		priv->qspi_is_init = 1;
@@ -166,6 +174,13 @@ static int cadence_spi_probe(struct udevice *bus)
 	return 0;
 }
 
+static int cadence_spi_remove(struct udevice *dev)
+{
+	struct cadence_spi_priv *priv = dev_get_priv(dev);
+
+	return reset_release_bulk(&priv->resets);
+}
+
 static int cadence_spi_set_mode(struct udevice *bus, uint mode)
 {
 	struct cadence_spi_priv *priv = dev_get_priv(bus);
@@ -342,4 +357,6 @@ U_BOOT_DRIVER(cadence_spi) = {
 	.platdata_auto_alloc_size = sizeof(struct cadence_spi_platdata),
 	.priv_auto_alloc_size = sizeof(struct cadence_spi_priv),
 	.probe = cadence_spi_probe,
+	.remove = cadence_spi_remove,
+	.flags = DM_FLAG_OS_PREPARE,
 };
diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h
index 055900def0..d4ede6e15e 100644
--- a/drivers/spi/cadence_qspi.h
+++ b/drivers/spi/cadence_qspi.h
@@ -7,6 +7,8 @@
 #ifndef __CADENCE_QSPI_H__
 #define __CADENCE_QSPI_H__
 
+#include <reset.h>
+
 #define CQSPI_IS_ADDR(cmd_len)		(cmd_len > 1 ? 1 : 0)
 
 #define CQSPI_NO_DECODER_MAX_CS		4
@@ -42,6 +44,8 @@ struct cadence_spi_priv {
 	unsigned int	qspi_calibrated_hz;
 	unsigned int	qspi_calibrated_cs;
 	unsigned int	previous_hz;
+
+	struct reset_ctl_bulk resets;
 };
 
 /* Functions call declaration */
-- 
2.17.1