pinctrl: meson: add GPIO support
This commit adds GPIO support to the Amlogic Meson pin controller
driver, based on code from Linux kernel.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h
index 4127a60..90d2369 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.h
+++ b/drivers/pinctrl/meson/pinctrl-meson.h
@@ -28,15 +28,64 @@
const char *name;
struct meson_pmx_group *groups;
struct meson_pmx_func *funcs;
+ struct meson_bank *banks;
unsigned int pin_base;
unsigned int num_pins;
unsigned int num_groups;
unsigned int num_funcs;
+ unsigned int num_banks;
};
struct meson_pinctrl {
struct meson_pinctrl_data *data;
void __iomem *reg_mux;
+ void __iomem *reg_gpio;
+};
+
+/**
+ * struct meson_reg_desc - a register descriptor
+ *
+ * @reg: register offset in the regmap
+ * @bit: bit index in register
+ *
+ * The structure describes the information needed to control pull,
+ * pull-enable, direction, etc. for a single pin
+ */
+struct meson_reg_desc {
+ unsigned int reg;
+ unsigned int bit;
+};
+
+/**
+ * enum meson_reg_type - type of registers encoded in @meson_reg_desc
+ */
+enum meson_reg_type {
+ REG_PULLEN,
+ REG_PULL,
+ REG_DIR,
+ REG_OUT,
+ REG_IN,
+ NUM_REG,
+};
+
+/**
+ * struct meson bank
+ *
+ * @name: bank name
+ * @first: first pin of the bank
+ * @last: last pin of the bank
+ * @regs: array of register descriptors
+ *
+ * A bank represents a set of pins controlled by a contiguous set of
+ * bits in the domain registers. The structure specifies which bits in
+ * the regmap control the different functionalities. Each member of
+ * the @regs array refers to the first pin of the bank.
+ */
+struct meson_bank {
+ const char *name;
+ unsigned int first;
+ unsigned int last;
+ struct meson_reg_desc regs[NUM_REG];
};
#define PIN(x, b) (b + x)
@@ -65,6 +114,20 @@
.num_groups = ARRAY_SIZE(fn ## _groups), \
}
+#define BANK(n, f, l, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
+ { \
+ .name = n, \
+ .first = f, \
+ .last = l, \
+ .regs = { \
+ [REG_PULLEN] = { per, peb }, \
+ [REG_PULL] = { pr, pb }, \
+ [REG_DIR] = { dr, db }, \
+ [REG_OUT] = { or, ob }, \
+ [REG_IN] = { ir, ib }, \
+ }, \
+ }
+
#define MESON_PIN(x, b) PINCTRL_PIN(PIN(x, b), #x)
extern const struct pinctrl_ops meson_pinctrl_ops;