pinctrl: meson: rework pinmux ops

This change prepare the introduction of new meson SoC. This new SoC will
share the same gpio/pinconf registers but the pinmux part will be
different. While the format of the data associated with each pinmux group
will change, the way to handle pinmuxing will be similar.

To deal with this new situation, the meson_pmx_struture is kept but the
data associated to it is now generic. This allows to reuse the basic
functions which would otherwise be copy/pasted in each pinmux driver
(such as getting the name a count of groups and functions) Only the
functions actually using this specific data is taken out of the common
code and is handling the SoC pinmuxing

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/pinctrl/meson/pinctrl-meson8-pmx.h b/drivers/pinctrl/meson/pinctrl-meson8-pmx.h
new file mode 100644
index 000000000000..47293c28f913
--- /dev/null
+++ b/drivers/pinctrl/meson/pinctrl-meson8-pmx.h
@@ -0,0 +1,48 @@
+/*
+ * First generation of pinmux driver for Amlogic Meson SoCs
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
+ * Copyright (C) 2017 Jerome Brunet  <jbrunet@baylibre.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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+struct meson8_pmx_data {
+	bool is_gpio;
+	unsigned int reg;
+	unsigned int bit;
+};
+
+#define PMX_DATA(r, b, g)						\
+	{								\
+		.reg = r,						\
+		.bit = b,						\
+		.is_gpio = g,						\
+	}
+
+#define GROUP(grp, r, b)						\
+	{								\
+		.name = #grp,						\
+		.pins = grp ## _pins,					\
+		.num_pins = ARRAY_SIZE(grp ## _pins),			\
+		.data = (const struct meson8_pmx_data[]){		\
+			PMX_DATA(r, b, false),				\
+		},							\
+	 }
+
+#define GPIO_GROUP(gpio)						\
+	{								\
+		.name = #gpio,						\
+		.pins = (const unsigned int[]){ gpio },			\
+		.num_pins = 1,						\
+		.data = (const struct meson8_pmx_data[]){		\
+			PMX_DATA(0, 0, true),				\
+		},							\
+	}
+
+extern const struct pinmux_ops meson8_pmx_ops;