From ac7e14ae0d36023dd32400a8eab9433a54e77b83 Mon Sep 17 00:00:00 2001
From: Simon Goldschmidt
Date: Fri, 1 Mar 2019 20:12:35 +0100
Subject: spi: cadence_qspi: add reset handling

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@gmail.com>
---
 drivers/spi/cadence_qspi.c | 17 +++++++++++++++++
 drivers/spi/cadence_qspi.h |  4 ++++
 2 files changed, 21 insertions(+)

(limited to 'drivers/spi')

diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index efdb178450e..41c87004d8c 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 b4914071308..20cceca239f 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 */
-- 
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