Add combined gpio and pin controller driver for Renesas RZ/A1
r7s72100 SoC.

Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
---
 drivers/pinctrl/Kconfig        |  10 +
 drivers/pinctrl/Makefile       |   1 +
 drivers/pinctrl/pinctrl-rza1.c | 961 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 972 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-rza1.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 8f8c2af..c9b55b9 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -163,6 +163,16 @@ config PINCTRL_ROCKCHIP
        select GENERIC_IRQ_CHIP
        select MFD_SYSCON
 
+config PINCTRL_RZA1
+       bool "Renesas RZ/A1 gpio and pinctrl driver"
+       depends on OF
+       depends on ARCH_R7S72100 || COMPILE_TEST
+       select GENERIC_PINCTRL_GROUPS
+       select GENERIC_PINMUX_FUNCTIONS
+       select GENERIC_PINCONF
+       help
+         This selects pinctrl driver for Renesas RZ/A1 platforms.
+
 config PINCTRL_SINGLE
        tristate "One-register-per-pin type device tree based pinctrl driver"
        depends on OF
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index a251f43..0c2328d2 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_PINCTRL_PALMAS)  += pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_PIC32)    += pinctrl-pic32.o
 obj-$(CONFIG_PINCTRL_PISTACHIO)        += pinctrl-pistachio.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
+obj-$(CONFIG_PINCTRL_RZA1)     += pinctrl-rza1.o
 obj-$(CONFIG_PINCTRL_SINGLE)   += pinctrl-single.o
 obj-$(CONFIG_PINCTRL_SIRF)     += sirf/
 obj-$(CONFIG_PINCTRL_SX150X)   += pinctrl-sx150x.o
diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c
new file mode 100644
index 0000000..0a4fc41
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-rza1.c
@@ -0,0 +1,961 @@
+/*
+ * Combined GPIO and pin controller support for Renesas RZ/A1 (r7s72100) SoC
+ *
+ * Copyright (C) 2017 Jacopo Mondi
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+/*
+ * This pincontroller/gpio combined driver support Renesas devices of RZ/A1
+ * family.
+ * This includes SoCs which are sub- or super- sets of this particular line,
+ * as RZ/A1H (r7s721000), RZ/A1M (r7s721010) and RZ/A1L (r7s721020) are.
+ */
+
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "devicetree.h"
+#include "pinmux.h"
+
+#define DRIVER_NAME                    "pinctrl-rza1"
+
+#define RZA1_PINMUX_OF_ARGS            2
+
+#define P_REG                          0x0000
+#define PPR_REG                                0x0200
+#define PM_REG                         0x0300
+#define PMC_REG                                0x0400
+#define PFC_REG                                0x0500
+#define PFCE_REG                       0x0600
+#define PFCEA_REG                      0x0a00
+#define PIBC_REG                       0x4000
+#define PBDC_REG                       0x4100
+#define PIPC_REG                       0x4200
+#define RZA1_ADDR(mem, reg, port)      ((mem) + (reg) + ((port) * 4))
+
+#define RZA1_NPORTS                    12
+#define RZA1_PINS_PER_PORT             16
+#define RZA1_NPINS                     (RZA1_PINS_PER_PORT * RZA1_NPORTS)
+#define RZA1_PIN_TO_PORT(pin)          ((pin) / RZA1_PINS_PER_PORT)
+#define RZA1_PIN_TO_OFFSET(pin)                ((pin) % RZA1_PINS_PER_PORT)
+
+/*
+ * Be careful here: the pin configuration subnodes in device tree enumerate
+ * alternate functions from 1 to 8; subtract 1 before using macros so to match
+ * register configuration which expects numbers from 0 to 7 instead.
+ */
+#define MUX_FUNC_OFFS                  3
+#define MUX_FUNC_MASK                  (BIT(MUX_FUNC_OFFS) - 1)
+#define MUX_FUNC_PFC_MASK              BIT(0)
+#define MUX_FUNC_PFCE_MASK             BIT(1)
+#define MUX_FUNC_PFCEA_MASK            BIT(2)
+#define MUX_CONF_BIDIR                 BIT(0)
+#define MUX_CONF_SWIO_INPUT            BIT(1)
+#define MUX_CONF_SWIO_OUTPUT           BIT(2)
+
+/**
+ * rza1_pin_conf - describes a pin position, id, mux config and output value
+ *
+ * @id: the pin identifier from 0 to RZA1_NPINS
+ * @port: the port where pin sits on
+ * @offset: pin offset in the port
+ * @mux: alternate function configuration settings
+ * @value: output value to set the pin to
+ */
+struct rza1_pin_conf {
+       u16 id;
+       u8 port;
+       u8 offset;
+       u8 mux_conf;
+       u8 value;
+};
+
+/**
+ * rza1_port - describes a pin port
+ *
+ * This is mostly useful to lock register writes per-bank and not globally.
+ *
+ * @lock: protect access to HW registers
+ * @id: port number
+ * @base: logical address base
+ * @pins: pins sitting on this port
+ */
+struct rza1_port {
+       spinlock_t lock;
+       unsigned int id;
+       void __iomem *base;
+       struct pinctrl_pin_desc *pins;
+};
+
+/**
+ * rza1_pinctrl - RZ pincontroller device
+ *
+ * @dev: parent device structure
+ * @mutex: protect [pinctrl|pinmux]_generic functions
+ * @base: logical address base
+ * @nports: number of pin controller ports
+ * @ports: pin controller banks
+ * @ngpiochips: number of gpio chips
+ * @gpio_ranges: gpio ranges for pinctrl core
+ * @pins: pin array for pinctrl core
+ * @desc: pincontroller desc for pinctrl core
+ * @pctl: pinctrl device
+ */
+struct rza1_pinctrl {
+       struct device *dev;
+
+       struct mutex mutex;
+
+       void __iomem *base;
+
+       unsigned int nport;
+       struct rza1_port *ports;
+
+       unsigned int ngpiochips;
+
+       struct pinctrl_gpio_range *gpio_ranges;
+       struct pinctrl_pin_desc *pins;
+       struct pinctrl_desc desc;
+       struct pinctrl_dev *pctl;
+};
+
+/* ----------------------------------------------------------------------------
+ * RZ/A1 SoC operations
+ */
+
+/**
+ * rza1_set_bit() - un-locked set/clear a single bit in pin configuration
+ *                 registers
+ */
+static inline void rza1_set_bit(struct rza1_port *port, unsigned int reg,
+                               unsigned int bit, bool set)
+{
+       void __iomem *mem = RZA1_ADDR(port->base, reg, port->id);
+       u16 val = ioread16(mem);
+
+       if (set)
+               val |= BIT(bit);
+       else
+               val &= ~BIT(bit);
+
+       iowrite16(val, mem);
+}
+
+static inline int rza1_get_bit(struct rza1_port *port, unsigned int reg,
+                              unsigned int bit)
+{
+       void __iomem *mem = RZA1_ADDR(port->base, reg, port->id);
+
+       return ioread16(mem) & BIT(bit);
+}
+
+/**
+ * rza1_pin_reset() - reset a pin to default initial state
+ *
+ * Reset pin state disabling input buffer and bi-directional control,
+ * and configure it as input port.
+ * Note that pin is now configured with direction as input but with input
+ * buffer disabled. This implies the pin value cannot be read in this state.
+ *
+ * @port: port where pin sits on
+ * @pin: pin offset
+ */
+static void rza1_pin_reset(struct rza1_port *port, unsigned int pin)
+{
+       unsigned long irqflags;
+
+       spin_lock_irqsave(&port->lock, irqflags);
+       rza1_set_bit(port, PIBC_REG, pin, 0);
+       rza1_set_bit(port, PBDC_REG, pin, 0);
+
+       rza1_set_bit(port, PM_REG, pin, 1);
+       rza1_set_bit(port, PMC_REG, pin, 0);
+       rza1_set_bit(port, PIPC_REG, pin, 0);
+       spin_unlock_irqrestore(&port->lock, irqflags);
+}
+
+static inline int rza1_pin_get_direction(struct rza1_port *port,
+                                        unsigned int pin)
+{
+       unsigned long irqflags;
+       int input;
+
+       spin_lock_irqsave(&port->lock, irqflags);
+       input = rza1_get_bit(port, PM_REG, pin);
+       spin_unlock_irqrestore(&port->lock, irqflags);
+
+       return input;
+}
+
+/**
+ * rza1_pin_set_direction() - set I/O direction on a pin in port mode
+ *
+ * When running in output port mode keep PBDC enabled to allow reading the
+ * pin value from PPR.
+ *
+ * @port: port where pin sits on
+ * @pin: pin offset
+ * @input: input enable/disable flag
+ */
+static inline void rza1_pin_set_direction(struct rza1_port *port,
+                                         unsigned int pin, bool input)
+{
+       unsigned long irqflags;
+
+       spin_lock_irqsave(&port->lock, irqflags);
+
+       rza1_set_bit(port, PIBC_REG, pin, 1);
+       if (input) {
+               rza1_set_bit(port, PM_REG, pin, 1);
+               rza1_set_bit(port, PBDC_REG, pin, 0);
+       } else {
+               rza1_set_bit(port, PM_REG, pin, 0);
+               rza1_set_bit(port, PBDC_REG, pin, 1);
+       }
+
+       spin_unlock_irqrestore(&port->lock, irqflags);
+}
+
+static inline void rza1_pin_set(struct rza1_port *port, unsigned int pin,
+                               unsigned int value)
+{
+       unsigned long irqflags;
+
+       spin_lock_irqsave(&port->lock, irqflags);
+       rza1_set_bit(port, P_REG, pin, !!value);
+       spin_unlock_irqrestore(&port->lock, irqflags);
+}
+
+static inline int rza1_pin_get(struct rza1_port *port, unsigned int pin)
+{
+       unsigned long irqflags;
+       int val;
+
+       spin_lock_irqsave(&port->lock, irqflags);
+       val = rza1_get_bit(port, PPR_REG, pin);
+       spin_unlock_irqrestore(&port->lock, irqflags);
+
+       return val;
+}
+
+/**
+ * rza1_alternate_function_conf() - configure pin in alternate function mode
+ *
+ * @pinctrl: RZ/A1 pin controller device
+ * @pin_conf: single pin configuration descriptor
+ */
+static int rza1_alternate_function_conf(struct rza1_pinctrl *rza1_pctl,
+                                       struct rza1_pin_conf *pin_conf)
+{
+       struct rza1_port *port = &rza1_pctl->ports[pin_conf->port];
+       u8 mux_mode = (pin_conf->mux_conf - 1) & MUX_FUNC_MASK;
+       u8 mux_conf = pin_conf->mux_conf >> MUX_FUNC_OFFS;
+       bool swio_out = !!(mux_conf & MUX_CONF_SWIO_OUTPUT);
+       bool swio_in = !!(mux_conf & MUX_CONF_SWIO_INPUT);
+       bool bidir_en = !!(mux_conf & MUX_CONF_BIDIR);
+       unsigned int offset = pin_conf->offset;
+
+       /* Make sure a single bit is set in mux_conf mask. */
+       if (ffs(mux_conf) != fls(mux_conf)) {
+               dev_err(rza1_pctl->dev,
+                       "Invalid pin configuration for pin %u:%u",
+                       port->id, offset);
+               return -EINVAL;
+       }
+
+       rza1_pin_reset(port, offset);
+
+       if (bidir_en)
+               rza1_set_bit(port, PBDC_REG, offset, 1);
+
+       /*
+        * Enable alternate function mode and select it.
+        *
+        * ----------------------------------------------------
+        * Alternate mode selection table:
+        *
+        * PMC  PFC     PFCE    PFCAE   mux_mode
+        * 1    0       0       0       0
+        * 1    1       0       0       1
+        * 1    0       1       0       2
+        * 1    1       1       0       3
+        * 1    0       0       1       4
+        * 1    1       0       1       5
+        * 1    0       1       1       6
+        * 1    1       1       1       7
+        * ----------------------------------------------------
+        */
+       rza1_set_bit(port, PFC_REG, offset, mux_mode & MUX_FUNC_PFC_MASK);
+       rza1_set_bit(port, PFCE_REG, offset, mux_mode & MUX_FUNC_PFCE_MASK);
+       rza1_set_bit(port, PFCEA_REG, offset, mux_mode & MUX_FUNC_PFCEA_MASK);
+
+       /*
+        * All alternate functions except a few (4) need PIPCn = 1.
+        * If PIPCn has to stay disabled (SW IO mode), configure PMn according
+        * to I/O direction specified by pin configuration -after- PMC has been
+        * set to one.
+        */
+       if (!(swio_in || swio_out))
+               rza1_set_bit(port, PIPC_REG, offset, 1);
+
+       rza1_set_bit(port, PMC_REG, offset, 1);
+       rza1_set_bit(port, PM_REG, offset, swio_in);
+
+       return 0;
+}
+
+/* ----------------------------------------------------------------------------
+ * pinctrl operations
+ */
+
+/**
+ * rza1_dt_node_to_map() - map a node to a function/group map
+ *
+ * Functions and groups are collected and registered to pinctrl_generic
+ * during DT parsing routine.
+ *
+ * @pctldev: pin controller device
+ * @np: device tree node to parse
+ * @map: pointer to pin map (output)
+ * @num_maps: number of collected maps (output)
+ */
+static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
+                              struct device_node *np,
+                              struct pinctrl_map **map,
+                              unsigned int *num_maps)
+{
+       struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev);
+       struct group_desc *grp;
+       unsigned int grp_sel;
+
+       /*
+        * Find the group of this node and check if we need create
+        * config maps for pins.
+        */
+       grp_sel = pinctrl_get_group_selector(pctldev, np->name);
+       if (grp_sel < 0) {
+               dev_err(rza1_pctl->dev, "unable to find group for node %s\n",
+                       np->name);
+               return -EINVAL;
+       }
+
+       grp = pinctrl_generic_get_group(pctldev, grp_sel);
+       if (!grp) {
+               dev_err(rza1_pctl->dev, "unable to find group for node %s\n",
+                       np->name);
+               return -EINVAL;
+       }
+
+       *num_maps = 0;
+       *map = kzalloc(sizeof(**map), GFP_KERNEL);
+       if (!*map)
+               return -ENOMEM;
+
+       (*map)->type    = PIN_MAP_TYPE_MUX_GROUP;
+       (*map)->data.mux.group  = np->name;
+       (*map)->data.mux.function = np->name;
+       *num_maps = 1;
+
+       return 0;
+}
+
+static void rza1_dt_free_map(struct pinctrl_dev *pctldev,
+                            struct pinctrl_map *map, unsigned int num_maps)
+{
+       kfree(map);
+}
+
+static const struct pinctrl_ops rza1_pinctrl_ops = {
+       .get_groups_count       = pinctrl_generic_get_group_count,
+       .get_group_name         = pinctrl_generic_get_group_name,
+       .get_group_pins         = pinctrl_generic_get_group_pins,
+       .dt_node_to_map         = rza1_dt_node_to_map,
+       .dt_free_map            = rza1_dt_free_map,
+};
+
+/* ----------------------------------------------------------------------------
+ * gpio operations
+ */
+
+/**
+ * rza1_gpio_request() - configure pin in port mode
+ *
+ * Configure a pin as gpio (port mode).
+ * After reset, the pin is in input mode with input buffer disabled.
+ * To use the pin as input or output, set_direction shall be called first
+ *
+ * @chip: gpio chip where the gpio sits on
+ * @gpio: gpio offset
+ */
+static int rza1_gpio_request(struct gpio_chip *chip, unsigned int gpio)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       rza1_pin_reset(port, gpio);
+
+       return 0;
+}
+
+/**
+ * rza1_gpio_disable_free() - reset a pin
+ *
+ * Surprisingly, disable_free a gpio, is equivalent to request it.
+ * Reset pin to port mode, with input buffer disabled. This overwrites all
+ * port direction settings applied with set_direction
+ *
+ * @chip: gpio chip where the gpio sits on
+ * @gpio: gpio offset
+ */
+static void rza1_gpio_free(struct gpio_chip *chip, unsigned int gpio)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       rza1_pin_reset(port, gpio);
+}
+
+static int rza1_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       return rza1_pin_get_direction(port, offset);
+}
+
+static int rza1_gpio_direction_input(struct gpio_chip *chip,
+                                    unsigned int offset)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       rza1_pin_set_direction(port, offset, true);
+
+       return 0;
+}
+
+static int rza1_gpio_direction_output(struct gpio_chip *chip,
+                                     unsigned int offset,
+                                     int value)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       /* Set value before driving pin direction */
+       rza1_pin_set(port, offset, value);
+       rza1_pin_set_direction(port, offset, false);
+
+       return 0;
+}
+
+/**
+ * rza1_gpio_get() - read a gpio pin value
+ *
+ * Read gpio pin value through PPR register.
+ * Requires bi-directional mode to work when reading the value of a pin
+ * in output mode
+ *
+ * @chip: gpio chip where the gpio sits on
+ * @gpio: gpio offset
+ */
+static int rza1_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       return rza1_pin_get(port, offset);
+}
+
+static void rza1_gpio_set(struct gpio_chip *chip, unsigned int offset,
+                         int value)
+{
+       struct rza1_port *port = gpiochip_get_data(chip);
+
+       rza1_pin_set(port, offset, value);
+}
+
+struct gpio_chip rza1_gpiochip_template = {
+       .request                = rza1_gpio_request,
+       .free                   = rza1_gpio_free,
+       .get_direction          = rza1_gpio_get_direction,
+       .direction_input        = rza1_gpio_direction_input,
+       .direction_output       = rza1_gpio_direction_output,
+       .get                    = rza1_gpio_get,
+       .set                    = rza1_gpio_set,
+};
+
+/* ----------------------------------------------------------------------------
+ * pinmux operations
+ */
+
+/**
+ * rza1_pinmux_set() - retrieve pins from a group and apply their mux settings
+ *
+ * @pctldev: pin controller device
+ * @selector: function selector
+ * @group: group selector
+ */
+static int rza1_pinmux_set(struct pinctrl_dev *pctldev, unsigned int selector,
+                          unsigned int group)
+{
+       struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev);
+       struct rza1_pin_conf *pin_confs;
+       struct function_desc *func;
+       struct group_desc *grp;
+       int i;
+
+       grp = pinctrl_generic_get_group(pctldev, group);
+       if (!grp)
+               return -EINVAL;
+
+       func = pinmux_generic_get_function(pctldev, selector);
+       if (!func)
+               return -EINVAL;
+
+       pin_confs = (struct rza1_pin_conf *)func->data;
+       for (i = 0; i < grp->num_pins; ++i) {
+               int ret;
+
+               ret = rza1_alternate_function_conf(rza1_pctl, &pin_confs[i]);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+struct pinmux_ops rza1_pinmux_ops = {
+       .get_functions_count    = pinmux_generic_get_function_count,
+       .get_function_name      = pinmux_generic_get_function_name,
+       .get_function_groups    = pinmux_generic_get_function_groups,
+       .set_mux                = rza1_pinmux_set,
+       .strict                 = true,
+};
+
+/* ----------------------------------------------------------------------------
+ * RZ/A1 pin controller driver operations
+ */
+
+static unsigned int rza1_count_gpio_chips(struct device_node *np)
+{
+       struct device_node *child;
+       unsigned int count = 0;
+
+       for_each_child_of_node(np, child) {
+               if (!of_property_read_bool(child, "gpio-controller"))
+                       continue;
+
+               count++;
+       }
+
+       return count;
+}
+
+/**
+ * rza1_parse_pmx_function() - parse and register a pin mux function
+ *
+ * Pins for RZ SoC pin controller described by "renesas-pins" property.
+ *
+ * First argument in the list identifies the pin, while the second one
+ * describes the requested alternate function number and additional
+ * configuration parameter to be applied to the selected function.
+ *
+ * @rza1_pctl: RZ/A1 pin controller device
+ * @np: of pmx sub-node
+ */
+static int rza1_parse_pmx_function(struct rza1_pinctrl *rza1_pctl,
+                                  struct device_node *np)
+{
+       struct pinctrl_dev *pctldev = rza1_pctl->pctl;
+       char const *prop_name = "renesas,pins";
+       struct rza1_pin_conf *pin_confs;
+       unsigned int *grpins;
+       const char *grpname;
+       const char **fngrps;
+       unsigned int i;
+       int of_npins;
+       int ret;
+
+       of_npins = pinctrl_count_index_with_args(np, prop_name);
+       if (of_npins <= 0) {
+               dev_err(rza1_pctl->dev, "Missing %s property\n", prop_name);
+               return -ENOENT;
+       }
+
+       /*
+        * Functions are made of 1 group only;
+        * in fact, functions and groups are identical for this pin controller
+        * except that functions carry an array of per-pin configuration
+        * settings.
+        */
+       pin_confs = devm_kcalloc(rza1_pctl->dev, of_npins, sizeof(*pin_confs),
+                                GFP_KERNEL);
+       grpins = devm_kcalloc(rza1_pctl->dev, of_npins, sizeof(*grpins),
+                             GFP_KERNEL);
+       fngrps = devm_kzalloc(rza1_pctl->dev, sizeof(*fngrps), GFP_KERNEL);
+
+       if (!pin_confs || !grpins || !fngrps)
+               return -ENOMEM;
+
+       /* Collect pin positions and mux settings to store them in function */
+       for (i = 0; i < of_npins; ++i) {
+               struct rza1_pin_conf *pin_conf = &pin_confs[i];
+               struct of_phandle_args of_npins_args;
+
+               ret = pinctrl_parse_index_with_args(np, prop_name, i,
+                                                   &of_npins_args);
+               if (ret)
+                       return ret;
+
+               if (of_npins_args.args_count < RZA1_PINMUX_OF_ARGS) {
+                       dev_err(rza1_pctl->dev,
+                               "Wrong number of arguments for %s property\n",
+                               prop_name);
+                       return -EINVAL;
+               }
+
+               /*
+                * This new pins configuration will be associated with a new
+                * function, and later used to set-up pin muxing
+                */
+               pin_conf->id = of_npins_args.args[0];
+               pin_conf->port = RZA1_PIN_TO_PORT(pin_conf->id);
+               pin_conf->offset = RZA1_PIN_TO_OFFSET(pin_conf->id);
+               pin_conf->mux_conf = of_npins_args.args[1];
+
+               if (pin_conf->port >= RZA1_NPORTS ||
+                   pin_conf->offset >= RZA1_PINS_PER_PORT) {
+                       dev_err(rza1_pctl->dev,
+                               "Wrong port %u pin %u for %s property\n",
+                               pin_conf->port, pin_conf->offset, prop_name);
+                       return -EINVAL;
+               }
+
+               grpins[i] = pin_conf->id;
+       }
+
+       grpname = np->name;
+       fngrps[0] = grpname;
+
+       mutex_lock(&rza1_pctl->mutex);
+       ret = pinctrl_generic_add_group(pctldev, grpname, grpins, of_npins,
+                                       NULL);
+       if (ret) {
+               mutex_unlock(&rza1_pctl->mutex);
+               return ret;
+       }
+
+       ret = pinmux_generic_add_function(pctldev, grpname, fngrps, 1,
+                                         pin_confs);
+       if (ret)
+               goto remove_group;
+       mutex_unlock(&rza1_pctl->mutex);
+
+       dev_info(rza1_pctl->dev, "Parsed function and group %s with %d pins\n",
+                                grpname, of_npins);
+
+       return 0;
+
+remove_group:
+       dev_info(rza1_pctl->dev, "Unable to parse function and group %s\n",
+                                grpname);
+       pinctrl_generic_remove_last_group(pctldev);
+       mutex_unlock(&rza1_pctl->mutex);
+
+       return ret;
+}
+
+/**
+ * rza1_remove_pmx_functions() - un-register pmx functions and groups
+ *
+ * @rza1_pctl: RZ/A1 pin controller device
+ */
+static void rza1_remove_pmx_functions(struct rza1_pinctrl *rza1_pctl)
+{
+       struct pinctrl_dev *pctldev = rza1_pctl->pctl;
+
+       mutex_lock(&rza1_pctl->mutex);
+       pinmux_generic_free_functions(pctldev);
+       mutex_unlock(&rza1_pctl->mutex);
+}
+
+/**
+ * rza1_parse_gpiochip() - parse and register a gpio chip and pin range
+ *
+ * The gpio controller subnode shall provide a "gpio-ranges" list property as
+ * defined by gpio device tree binding documentation.
+ * Gpio chips and pin ranges are here collected, but ranges are registered
+ * later, after the pin controller has been registered too. Only gpiochips are
+ * registered here.
+ *
+ * @rza1_pctl: RZ/A1 pin controller device
+ * @np: of gpio-controller node
+ * @chip: gpio chip to register to gpiolib
+ * @range: pin range to register to pinctrl core
+ */
+static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
+                              struct device_node *np,
+                              struct gpio_chip *chip,
+                              struct pinctrl_gpio_range *range)
+{
+       const char *list_name = "gpio-ranges";
+       struct of_phandle_args of_args;
+       unsigned int gpioport;
+       u32 pinctrl_base;
+       int ret;
+
+       ret = of_parse_phandle_with_fixed_args(np, list_name, 3, 0, &of_args);
+       if (ret) {
+               dev_err(rza1_pctl->dev, "Unable to parse %s list property\n",
+                       list_name);
+               return ret;
+       }
+
+       /*
+        * Find out on which port this gpio-chip maps to by inspecting the
+        * second argument of the "gpio-ranges" property.
+        */
+       pinctrl_base = of_args.args[1];
+       gpioport = RZA1_PIN_TO_PORT(pinctrl_base);
+       if (gpioport > RZA1_NPORTS) {
+               dev_err(rza1_pctl->dev,
+                       "Invalid values in property %s\n", list_name);
+               return -EINVAL;
+       }
+
+       *chip           = rza1_gpiochip_template;
+       chip->base      = -1;
+       chip->label     = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, "%s-%u",
+                                        np->name, gpioport);
+       chip->ngpio     = of_args.args[2];
+       chip->of_node   = np;
+       chip->parent    = rza1_pctl->dev;
+
+       range->id       = gpioport;
+       range->name     = chip->label;
+       range->pin_base = range->base = pinctrl_base;
+       range->npins    = of_args.args[2];
+       range->gc       = chip;
+
+       ret = devm_gpiochip_add_data(rza1_pctl->dev, chip,
+                                    &rza1_pctl->ports[gpioport]);
+       if (ret)
+               return ret;
+
+       dev_info(rza1_pctl->dev, "Parsed gpiochip %s with %d pins\n",
+                chip->label, chip->ngpio);
+
+       return 0;
+}
+
+/**
+ * rza1_parse_dt() - parse DT to collect gpiochips and pmx functions
+ *
+ * @rza1_pctl: RZ/A1 pin controller device
+ */
+static int rza1_parse_dt(struct rza1_pinctrl *rza1_pctl)
+{
+       struct device_node *np = rza1_pctl->dev->of_node;
+       struct pinctrl_gpio_range *gpio_ranges;
+       struct gpio_chip *gpio_chips;
+       struct device_node *child;
+       unsigned int ngpiochips;
+       unsigned int npmxfuncs;
+       unsigned int i;
+       int ret;
+
+       ngpiochips = rza1_count_gpio_chips(np);
+       if (ngpiochips) {
+               dev_info(rza1_pctl->dev, "Registering %u gpio chips\n",
+                                        ngpiochips);
+
+               gpio_chips = devm_kcalloc(rza1_pctl->dev, ngpiochips,
+                                         sizeof(*gpio_chips), GFP_KERNEL);
+               gpio_ranges = devm_kcalloc(rza1_pctl->dev, ngpiochips,
+                                          sizeof(*gpio_ranges), GFP_KERNEL);
+               if (!gpio_chips || !gpio_ranges)
+                       return -ENOMEM;
+       } else {
+               dev_dbg(rza1_pctl->dev, "No gpiochip registered\n");
+               gpio_ranges = NULL;
+       }
+
+       rza1_pctl->gpio_ranges  = gpio_ranges;
+
+       i = 0;
+       npmxfuncs = 0;
+       for_each_child_of_node(np, child) {
+               if (of_property_read_bool(child, "gpio-controller")) {
+                       /* Never get here if ngpiochips == 0 */
+                       ret = rza1_parse_gpiochip(rza1_pctl, child,
+                                                 &gpio_chips[i],
+                                                 &gpio_ranges[i]);
+                       if (ret)
+                               goto gpio_pmx_unregister;
+
+                       ++i;
+               } else {
+                       ret = rza1_parse_pmx_function(rza1_pctl, child);
+                       if (ret)
+                               goto gpio_pmx_unregister;
+
+                       ++npmxfuncs;
+               }
+       }
+
+       rza1_pctl->ngpiochips = i;
+
+       dev_info(rza1_pctl->dev,
+                "Registered %u gpio controllers and %u pin mux functions\n",
+                rza1_pctl->ngpiochips, npmxfuncs);
+
+       return 0;
+
+gpio_pmx_unregister:
+       for (; i > 0; i--)
+               devm_gpiochip_remove(rza1_pctl->dev, &gpio_chips[i - 1]);
+
+       rza1_remove_pmx_functions(rza1_pctl);
+
+       return ret;
+}
+
+/**
+ * rza1_pinctrl_register() - Enumerate pins, ports, gpiochips, pmx functions
+ *                          and register to pinctrl and gpio cores
+ *
+ * @rza1_pctl: RZ/A1 pin controller device
+ */
+static int rza1_pinctrl_register(struct rza1_pinctrl *rza1_pctl)
+{
+       struct pinctrl_pin_desc *pins;
+       struct rza1_port *ports;
+       unsigned int i;
+       int ret;
+
+       pins = devm_kcalloc(rza1_pctl->dev, RZA1_NPINS, sizeof(*pins),
+                           GFP_KERNEL);
+       ports = devm_kcalloc(rza1_pctl->dev, RZA1_NPORTS, sizeof(*ports),
+                            GFP_KERNEL);
+       if (!pins || !ports)
+               return -ENOMEM;
+
+       rza1_pctl->pins         = pins;
+       rza1_pctl->desc.pins    = pins;
+       rza1_pctl->desc.npins   = RZA1_NPINS;
+       rza1_pctl->ports        = ports;
+
+       for (i = 0; i < RZA1_NPINS; ++i) {
+               unsigned int offset = RZA1_PIN_TO_OFFSET(i);
+               unsigned int port = RZA1_PIN_TO_PORT(i);
+
+               pins[i].number = i;
+               pins[i].name = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL,
+                                             "P%u-%u", port, offset);
+
+               if (i % RZA1_PINS_PER_PORT == 0) {
+                       /*
+                        * Setup ports;
+                        * they provide per-port lock and logical base address.
+                        */
+                       unsigned int port_id = RZA1_PIN_TO_PORT(i);
+
+                       ports[port_id].id = port_id;
+                       ports[port_id].base = rza1_pctl->base;
+                       ports[port_id].pins = &pins[i];
+                       spin_lock_init(&ports[port_id].lock);
+               }
+       }
+
+       ret = devm_pinctrl_register_and_init(rza1_pctl->dev, &rza1_pctl->desc,
+                                            rza1_pctl, &rza1_pctl->pctl);
+       if (ret) {
+               dev_err(rza1_pctl->dev,
+                       "RZ/A1 pin controller registration failed\n");
+               return ret;
+       }
+
+       ret = rza1_parse_dt(rza1_pctl);
+       if (ret) {
+               dev_err(rza1_pctl->dev, "RZ/A1 DT parsing failed\n");
+               return ret;
+       }
+
+       for (i = 0; i < rza1_pctl->ngpiochips; i++)
+               pinctrl_add_gpio_range(rza1_pctl->pctl,
+                                      &rza1_pctl->gpio_ranges[i]);
+
+       return 0;
+}
+
+static int rza1_pinctrl_probe(struct platform_device *pdev)
+{
+       struct rza1_pinctrl *rza1_pctl;
+       struct resource *res;
+       int ret;
+
+       rza1_pctl = devm_kzalloc(&pdev->dev, sizeof(*rza1_pctl), GFP_KERNEL);
+       if (!rza1_pctl)
+               return -ENOMEM;
+
+       rza1_pctl->dev = &pdev->dev;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (ret)
+               return -ENODEV;
+
+       rza1_pctl->base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(rza1_pctl->base))
+               return PTR_ERR(rza1_pctl->base);
+
+       mutex_init(&rza1_pctl->mutex);
+
+       platform_set_drvdata(pdev, rza1_pctl);
+
+       rza1_pctl->desc.name    = DRIVER_NAME;
+       rza1_pctl->desc.pctlops = &rza1_pinctrl_ops;
+       rza1_pctl->desc.pmxops  = &rza1_pinmux_ops;
+       rza1_pctl->desc.owner   = THIS_MODULE;
+
+       ret = rza1_pinctrl_register(rza1_pctl);
+       if (ret)
+               return ret;
+
+       dev_info(&pdev->dev,
+                "RZ/A1 pin controller and gpio successfully registered\n");
+
+       return 0;
+}
+
+static const struct of_device_id rza1_pinctrl_of_match[] = {
+       { .compatible = "renesas,r7s72100-ports", },
+       { }
+};
+
+static struct platform_driver rza1_pinctrl_driver = {
+       .driver = {
+               .name = DRIVER_NAME,
+               .of_match_table = rza1_pinctrl_of_match,
+       },
+       .probe = rza1_pinctrl_probe,
+};
+
+static int __init rza1_pinctrl_init(void)
+{
+       return platform_driver_register(&rza1_pinctrl_driver);
+}
+core_initcall(rza1_pinctrl_init);
+
+MODULE_AUTHOR("Jacopo Mondi <jacopo+rene...@jmondi.org");
+MODULE_DESCRIPTION("Pin and gpio controller driver for Reneas RZ/A1 SoC");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

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