Merge tag 'reset-for-4.5-2' of git://git.pengutronix.de/git/pza/linux into next/drivers

Merge "Reset controller changes for v4.5 v2" from Philipp Zabel:

- oftree support for getting reset devices by index
- fixed return value consistency of of_reset_control_get
- added support for STi co-processor resets
- added STi status callback
- added HiSilicon Hi6220 reset driver
- added ath79 system restart support
- various fixes

* tag 'reset-for-4.5-2' of git://git.pengutronix.de/git/pza/linux:
  reset: ath79: Add system restart support
  arm64: dts: Add reset dts config for Hisilicon Hi6220 SoC
  reset: hi6220: Reset driver for hisilicon hi6220 SoC
  reset: hisilicon: document hisi-hi6220 reset controllers bindings
  reset: remove unused device pointer from struct reset_control

7 files changed, 146 insertions, 9 deletions

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 0615f50a14cd..df37212a5cbd 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -13,3 +13,4 @@ menuconfig RESET_CONTROLLER
 	  If unsure, say no.
 
 source "drivers/reset/sti/Kconfig"
+source "drivers/reset/hisilicon/Kconfig"
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index f191cf33be16..4d7178e46afa 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -4,5 +4,6 @@ obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o
 obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o
 obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_ARCH_STI) += sti/
+obj-$(CONFIG_ARCH_HISI) += hisilicon/
 obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o
 obj-$(CONFIG_ATH79) += reset-ath79.o
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 9ab929049b9d..87376638948d 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -30,7 +30,6 @@ static LIST_HEAD(reset_controller_list);
  */
 struct reset_control {
 	struct reset_controller_dev *rcdev;
-	struct device *dev;
 	unsigned int id;
 };
 
@@ -236,16 +235,10 @@ EXPORT_SYMBOL_GPL(of_reset_control_get);
  */
 struct reset_control *reset_control_get(struct device *dev, const char *id)
 {
-	struct reset_control *rstc;
-
 	if (!dev)
 		return ERR_PTR(-EINVAL);
 
-	rstc = of_reset_control_get(dev->of_node, id);
-	if (!IS_ERR(rstc))
-		rstc->dev = dev;
-
-	return rstc;
+	return of_reset_control_get(dev->of_node, id);
 }
 EXPORT_SYMBOL_GPL(reset_control_get);
 
diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig
new file mode 100644
index 000000000000..26bf95a83a8e
--- /dev/null
+++ b/drivers/reset/hisilicon/Kconfig
@@ -0,0 +1,5 @@
+config COMMON_RESET_HI6220
+	tristate "Hi6220 Reset Driver"
+	depends on (ARCH_HISI && RESET_CONTROLLER)
+	help
+	  Build the Hisilicon Hi6220 reset driver.
diff --git a/drivers/reset/hisilicon/Makefile b/drivers/reset/hisilicon/Makefile
new file mode 100644
index 000000000000..c932f86e2f10
--- /dev/null
+++ b/drivers/reset/hisilicon/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o
diff --git a/drivers/reset/hisilicon/hi6220_reset.c b/drivers/reset/hisilicon/hi6220_reset.c
new file mode 100644
index 000000000000..d17c910e8b63
--- /dev/null
+++ b/drivers/reset/hisilicon/hi6220_reset.c
@@ -0,0 +1,108 @@
+/*
+ * Hisilicon Hi6220 reset controller driver
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * Author: Feng Chen <puck.chen@hisilicon.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/of.h>
+#include <linux/reset-controller.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+
+#define ASSERT_OFFSET            0x300
+#define DEASSERT_OFFSET          0x304
+#define MAX_INDEX                0x509
+
+#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
+
+struct hi6220_reset_data {
+	void __iomem			*assert_base;
+	void __iomem			*deassert_base;
+	struct reset_controller_dev	rc_dev;
+};
+
+static int hi6220_reset_assert(struct reset_controller_dev *rc_dev,
+			       unsigned long idx)
+{
+	struct hi6220_reset_data *data = to_reset_data(rc_dev);
+
+	int bank = idx >> 8;
+	int offset = idx & 0xff;
+
+	writel(BIT(offset), data->assert_base + (bank * 0x10));
+
+	return 0;
+}
+
+static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,
+				 unsigned long idx)
+{
+	struct hi6220_reset_data *data = to_reset_data(rc_dev);
+
+	int bank = idx >> 8;
+	int offset = idx & 0xff;
+
+	writel(BIT(offset), data->deassert_base + (bank * 0x10));
+
+	return 0;
+}
+
+static struct reset_control_ops hi6220_reset_ops = {
+	.assert = hi6220_reset_assert,
+	.deassert = hi6220_reset_deassert,
+};
+
+static int hi6220_reset_probe(struct platform_device *pdev)
+{
+	struct hi6220_reset_data *data;
+	struct resource *res;
+	void __iomem *src_base;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	src_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(src_base))
+		return PTR_ERR(src_base);
+
+	data->assert_base = src_base + ASSERT_OFFSET;
+	data->deassert_base = src_base + DEASSERT_OFFSET;
+	data->rc_dev.nr_resets = MAX_INDEX;
+	data->rc_dev.ops = &hi6220_reset_ops;
+	data->rc_dev.of_node = pdev->dev.of_node;
+
+	reset_controller_register(&data->rc_dev);
+
+	return 0;
+}
+
+static const struct of_device_id hi6220_reset_match[] = {
+	{ .compatible = "hisilicon,hi6220-sysctrl" },
+	{ },
+};
+
+static struct platform_driver hi6220_reset_driver = {
+	.probe = hi6220_reset_probe,
+	.driver = {
+		.name = "reset-hi6220",
+		.of_match_table = hi6220_reset_match,
+	},
+};
+
+static int __init hi6220_reset_init(void)
+{
+	return platform_driver_register(&hi6220_reset_driver);
+}
+
+postcore_initcall(hi6220_reset_init);
diff --git a/drivers/reset/reset-ath79.c b/drivers/reset/reset-ath79.c
index 9aaf646ece55..692fc890e94b 100644
--- a/drivers/reset/reset-ath79.c
+++ b/drivers/reset/reset-ath79.c
@@ -15,13 +15,17 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/reset-controller.h>
+#include <linux/reboot.h>
 
 struct ath79_reset {
 	struct reset_controller_dev rcdev;
+	struct notifier_block restart_nb;
 	void __iomem *base;
 	spinlock_t lock;
 };
 
+#define FULL_CHIP_RESET 24
+
 static int ath79_reset_update(struct reset_controller_dev *rcdev,
 			unsigned long id, bool assert)
 {
@@ -72,10 +76,22 @@ static struct reset_control_ops ath79_reset_ops = {
 	.status = ath79_reset_status,
 };
 
+static int ath79_reset_restart_handler(struct notifier_block *nb,
+				unsigned long action, void *data)
+{
+	struct ath79_reset *ath79_reset =
+		container_of(nb, struct ath79_reset, restart_nb);
+
+	ath79_reset_assert(&ath79_reset->rcdev, FULL_CHIP_RESET);
+
+	return NOTIFY_DONE;
+}
+
 static int ath79_reset_probe(struct platform_device *pdev)
 {
 	struct ath79_reset *ath79_reset;
 	struct resource *res;
+	int err;
 
 	ath79_reset = devm_kzalloc(&pdev->dev,
 				sizeof(*ath79_reset), GFP_KERNEL);
@@ -96,13 +112,25 @@ static int ath79_reset_probe(struct platform_device *pdev)
 	ath79_reset->rcdev.of_reset_n_cells = 1;
 	ath79_reset->rcdev.nr_resets = 32;
 
-	return reset_controller_register(&ath79_reset->rcdev);
+	err = reset_controller_register(&ath79_reset->rcdev);
+	if (err)
+		return err;
+
+	ath79_reset->restart_nb.notifier_call = ath79_reset_restart_handler;
+	ath79_reset->restart_nb.priority = 128;
+
+	err = register_restart_handler(&ath79_reset->restart_nb);
+	if (err)
+		dev_warn(&pdev->dev, "Failed to register restart handler\n");
+
+	return 0;
 }
 
 static int ath79_reset_remove(struct platform_device *pdev)
 {
 	struct ath79_reset *ath79_reset = platform_get_drvdata(pdev);
 
+	unregister_restart_handler(&ath79_reset->restart_nb);
 	reset_controller_unregister(&ath79_reset->rcdev);
 
 	return 0;