1 files changed, 105 insertions, 0 deletions
diff --git a/include/syscon.h b/include/syscon.h
new file mode 100644
index 0000000..3df96e3
--- /dev/null
+++ b/include/syscon.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __SYSCON_H
+#define __SYSCON_H
+
+#include <dm/ofnode.h>
+#include <fdtdec.h>
+
+/**
+ * struct syscon_uc_info - Information stored by the syscon UCLASS_UCLASS
+ *
+ * @regmap:	Register map for this controller
+ */
+struct syscon_uc_info {
+	struct regmap *regmap;
+};
+
+/* So far there are no ops so this is a placeholder */
+struct syscon_ops {
+};
+
+#define syscon_get_ops(dev)        ((struct syscon_ops *)(dev)->driver->ops)
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+/*
+ * We don't support 64-bit machines. If they are so resource-contrained that
+ * they need to use OF_PLATDATA, something is horribly wrong with the
+ * education of our hardware engineers.
+ *
+ * Update: 64-bit is now supported and we have an education crisis.
+ */
+struct syscon_base_platdata {
+	fdt_val_t reg[2];
+};
+#endif
+
+/**
+ * syscon_get_regmap() - Get access to a register map
+ *
+ * @dev:	Device to check (UCLASS_SCON)
+ * @info:	Returns regmap for the device
+ * @return 0 if OK, -ve on error
+ */
+struct regmap *syscon_get_regmap(struct udevice *dev);
+
+/**
+ * syscon_get_regmap_by_driver_data() - Look up a controller by its ID
+ *
+ * Each system controller can be accessed by its driver data, which is
+ * assumed to be unique through the scope of all system controllers that
+ * are in use. This function looks up the controller given this driver data.
+ *
+ * @driver_data:	Driver data value to look up
+ * @devp:		Returns the controller correponding to @driver_data
+ * @return 0 on success, -ENODEV if the ID was not found, or other -ve error
+ *	   code
+ */
+int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp);
+
+/**
+ * syscon_get_regmap_by_driver_data() - Look up a controller by its ID
+ *
+ * Each system controller can be accessed by its driver data, which is
+ * assumed to be unique through the scope of all system controllers that
+ * are in use. This function looks up the regmap given this driver data.
+ *
+ * @driver_data:	Driver data value to look up
+ * @return register map correponding to @driver_data, or -ve error code
+ */
+struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data);
+
+/**
+ * syscon_regmap_lookup_by_phandle() - Look up a controller by a phandle
+ *
+ * This operates by looking up the given name in the device (device
+ * tree property) of the device using the system controller.
+ *
+ * @dev:	Device using the system controller
+ * @name:	Name of property referring to the system controller
+ * @return	A pointer to the regmap if found, ERR_PTR(-ve) on error
+ */
+struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
+					       const char *name);
+
+/**
+ * syscon_get_first_range() - get the first memory range from a syscon regmap
+ *
+ * @driver_data:	Driver data value to look up
+ * @return first region of register map correponding to @driver_data, or
+ *			-ve error code
+ */
+void *syscon_get_first_range(ulong driver_data);
+
+/**
+ * syscon_node_to_regmap - get regmap from syscon
+ *
+ * @node:		Device node of syscon
+ */
+struct regmap *syscon_node_to_regmap(ofnode node);
+
+#endif