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Diffstat (limited to 'drivers/gpio/gpio-i8255.h')
-rw-r--r--drivers/gpio/gpio-i8255.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-i8255.h b/drivers/gpio/gpio-i8255.h
new file mode 100644
index 0000000000..9dcf639b94
--- /dev/null
+++ b/drivers/gpio/gpio-i8255.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright 2022 William Breathitt Gray */
+#ifndef _I8255_H_
+#define _I8255_H_
+
+struct device;
+struct irq_domain;
+struct regmap;
+
+#define i8255_volatile_regmap_range(_base) regmap_reg_range(_base, _base + 0x2)
+
+/**
+ * struct i8255_regmap_config - Configuration for the register map of an i8255
+ * @parent: parent device
+ * @map: regmap for the i8255
+ * @num_ppi: number of i8255 Programmable Peripheral Interface
+ * @names: (optional) array of names for gpios
+ * @domain: (optional) IRQ domain if the controller is interrupt-capable
+ *
+ * Note: The regmap is expected to have cache enabled and i8255 control
+ * registers not marked as volatile.
+ */
+struct i8255_regmap_config {
+ struct device *parent;
+ struct regmap *map;
+ int num_ppi;
+ const char *const *names;
+ struct irq_domain *domain;
+};
+
+int devm_i8255_regmap_register(struct device *dev,
+ const struct i8255_regmap_config *config);
+
+#endif /* _I8255_H_ */