pinctrl: madera: Add driver for Cirrus Logic Madera codecs

These codecs have a variable number of I/O lines each of which
is individually selectable to a wide range of possible functions.

The functionality is slightly different from the traditional muxed
GPIO since most of the functions can be mapped to any pin (and even
the same function to multiple pins). Most pins have a dedicated
"alternate" function that is only available on that pin. The
alternate functions are usually a group of signals, though it is
not always necessary to enable the full group, depending on the
alternate function and how it is to be used. The mapping between
alternate functions and GPIO pins varies between codecs depending
on the number of alternate functions and available pins.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/pinctrl/cirrus/pinctrl-madera.h b/drivers/pinctrl/cirrus/pinctrl-madera.h
new file mode 100644
index 000000000000..8000f4f832a1
--- /dev/null
+++ b/drivers/pinctrl/cirrus/pinctrl-madera.h
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Pinctrl for Cirrus Logic Madera codecs
+ *
+ * Copyright (C) 2016-2017 Cirrus Logic
+ *
+ * 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; version 2.
+ */
+
+#ifndef PINCTRL_MADERA_H
+#define PINCTRL_MADERA_H
+
+struct madera_pin_groups {
+	const char *name;
+	const unsigned int *pins;
+	unsigned int n_pins;
+};
+
+struct madera_pin_chip {
+	unsigned int n_pins;
+
+	const struct madera_pin_groups *pin_groups;
+	unsigned int n_pin_groups;
+};
+
+struct madera_pin_private {
+	struct madera *madera;
+
+	const struct madera_pin_chip *chip; /* chip-specific groups */
+
+	struct device *dev;
+	struct pinctrl_dev *pctl;
+};
+
+extern const struct madera_pin_chip cs47l35_pin_chip;
+extern const struct madera_pin_chip cs47l85_pin_chip;
+extern const struct madera_pin_chip cs47l90_pin_chip;
+
+#endif