summaryrefslogtreecommitdiffstats
path: root/drivers/reset/reset-simple.h
diff options
context:
space:
mode:
authorPhilipp Zabel <p.zabel@pengutronix.de>2017-08-11 12:58:43 +0200
committerPhilipp Zabel <p.zabel@pengutronix.de>2017-10-17 15:35:20 +0200
commit81c22ad0cc7db056408d6089c9303b2f6e486518 (patch)
tree28322e2d9c3e435ca4688311f3fc4f5b61649974 /drivers/reset/reset-simple.h
parent7e8838fe59515860823233353227e89b82b8794e (diff)
downloadlinux-81c22ad0cc7db056408d6089c9303b2f6e486518.tar.gz
linux-81c22ad0cc7db056408d6089c9303b2f6e486518.tar.bz2
linux-81c22ad0cc7db056408d6089c9303b2f6e486518.zip
reset: add reset-simple to unify socfpga, stm32, sunxi, and zx2967
Copy reusable parts from the sunxi driver, to add a driver for simple reset controllers with reset lines that can be controlled by toggling bits in exclusive, contiguous register ranges using read-modify-write cycles under a spinlock. The following patches will replace compatible reset drivers with reset-simple, extending it where necessary. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Alexandru Gagniuc <alex.g@adaptrum.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Diffstat (limited to 'drivers/reset/reset-simple.h')
-rw-r--r--drivers/reset/reset-simple.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/reset/reset-simple.h b/drivers/reset/reset-simple.h
new file mode 100644
index 000000000000..39af2014b5f1
--- /dev/null
+++ b/drivers/reset/reset-simple.h
@@ -0,0 +1,41 @@
+/*
+ * Simple Reset Controller ops
+ *
+ * Based on Allwinner SoCs Reset Controller driver
+ *
+ * Copyright 2013 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __RESET_SIMPLE_H__
+#define __RESET_SIMPLE_H__
+
+#include <linux/io.h>
+#include <linux/reset-controller.h>
+#include <linux/spinlock.h>
+
+/**
+ * struct reset_simple_data - driver data for simple reset controllers
+ * @lock: spinlock to protect registers during read-modify-write cycles
+ * @membase: memory mapped I/O register range
+ * @rcdev: reset controller device base structure
+ * @active_low: if true, bits are cleared to assert the reset. Otherwise, bits
+ * are set to assert the reset. Note that this says nothing about
+ * the voltage level of the actual reset line.
+ */
+struct reset_simple_data {
+ spinlock_t lock;
+ void __iomem *membase;
+ struct reset_controller_dev rcdev;
+ bool active_low;
+};
+
+extern const struct reset_control_ops reset_simple_ops;
+
+#endif /* __RESET_SIMPLE_H__ */