sh-pfc: Compute pin ranges automatically

Remove the manually specified ranges from PFC SoC data and compute the
ranges automatically. This prevents ranges from being out-of-sync with
pins definitions.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Yusuke Goda <yusuke.goda.sx@renesas.com>

7 files changed, 88 insertions, 88 deletions

diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index 96b02246796a..cb47bcee0aab 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -82,17 +82,14 @@ int sh_pfc_get_pin_index(struct sh_pfc *pfc, unsigned int pin)
         unsigned int offset;
         unsigned int i;
 
-        if (pfc->info->ranges == NULL)
-                return pin;
-
-        for (i = 0, offset = 0; i < pfc->info->nr_ranges; ++i) {
-                const struct pinmux_range *range = &pfc->info->ranges[i];
+        for (i = 0, offset = 0; i < pfc->nr_ranges; ++i) {
+                const struct sh_pfc_pin_range *range = &pfc->ranges[i];
 
                 if (pin <= range->end)
-                        return pin >= range->begin
-                             ? offset + pin - range->begin : -1;
+                        return pin >= range->start
+                             ? offset + pin - range->start : -1;
 
-                offset += range->end - range->begin + 1;
+                offset += range->end - range->start + 1;
         }
 
         return -EINVAL;
@@ -341,6 +338,59 @@ int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type)
         return 0;
 }
 
+static int sh_pfc_init_ranges(struct sh_pfc *pfc)
+{
+        struct sh_pfc_pin_range *range;
+        unsigned int nr_ranges;
+        unsigned int i;
+
+        if (pfc->info->pins[0].pin == (u16)-1) {
+                /* Pin number -1 denotes that the SoC doesn't report pin numbers
+                 * in its pin arrays yet. Consider the pin numbers range as
+                 * continuous and allocate a single range.
+                 */
+                pfc->nr_ranges = 1;
+                pfc->ranges = devm_kzalloc(pfc->dev, sizeof(*pfc->ranges),
+                                           GFP_KERNEL);
+                if (pfc->ranges == NULL)
+                        return -ENOMEM;
+
+                pfc->ranges->start = 0;
+                pfc->ranges->end = pfc->info->nr_pins - 1;
+                pfc->nr_gpio_pins = pfc->info->nr_pins;
+
+                return 0;
+        }
+
+        /* Count, allocate and fill the ranges. */
+        for (i = 1, nr_ranges = 1; i < pfc->info->nr_pins; ++i) {
+                if (pfc->info->pins[i-1].pin != pfc->info->pins[i].pin - 1)
+                        nr_ranges++;
+        }
+
+        pfc->nr_ranges = nr_ranges;
+        pfc->ranges = devm_kzalloc(pfc->dev, sizeof(*pfc->ranges) * nr_ranges,
+                                   GFP_KERNEL);
+        if (pfc->ranges == NULL)
+                return -ENOMEM;
+
+        range = pfc->ranges;
+        range->start = pfc->info->pins[0].pin;
+
+        for (i = 1; i < pfc->info->nr_pins; ++i) {
+                if (pfc->info->pins[i-1].pin != pfc->info->pins[i].pin - 1) {
+                        range->end = pfc->info->pins[i-1].pin;
+                        range++;
+                        range->start = pfc->info->pins[i].pin;
+                }
+        }
+
+        range->end = pfc->info->pins[i-1].pin;
+        pfc->nr_gpio_pins = range->end + 1;
+
+        return 0;
+}
+
 #ifdef CONFIG_OF
 static const struct of_device_id sh_pfc_of_table[] = {
 #ifdef CONFIG_PINCTRL_PFC_R8A73A4
@@ -431,6 +481,10 @@ static int sh_pfc_probe(struct platform_device *pdev)
 
         pinctrl_provide_dummies();
 
+        ret = sh_pfc_init_ranges(pfc);
+        if (ret < 0)
+                return ret;
+
         /*
          * Initialize pinctrl bindings first
          */
diff --git a/drivers/pinctrl/sh-pfc/core.h b/drivers/pinctrl/sh-pfc/core.h
index 93963a19b340..a1b23762ac90 100644
--- a/drivers/pinctrl/sh-pfc/core.h
+++ b/drivers/pinctrl/sh-pfc/core.h
@@ -25,6 +25,11 @@ struct sh_pfc_window {
 struct sh_pfc_chip;
 struct sh_pfc_pinctrl;
 
+struct sh_pfc_pin_range {
+        u16 start;
+        u16 end;
+};
+
 struct sh_pfc {
         struct device *dev;
         const struct sh_pfc_soc_info *info;
@@ -34,6 +39,9 @@ struct sh_pfc {
         unsigned int num_windows;
         struct sh_pfc_window *window;
 
+        struct sh_pfc_pin_range *ranges;
+        unsigned int nr_ranges;
+
         unsigned int nr_gpio_pins;
 
         struct sh_pfc_chip *gpio;
diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c
index 7661be5054a0..78fcb8029afd 100644
--- a/drivers/pinctrl/sh-pfc/gpio.c
+++ b/drivers/pinctrl/sh-pfc/gpio.c
@@ -334,10 +334,7 @@ sh_pfc_add_gpiochip(struct sh_pfc *pfc, int(*setup)(struct sh_pfc_chip *),
 
 int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
 {
-        const struct pinmux_range *ranges;
-        struct pinmux_range def_range;
         struct sh_pfc_chip *chip;
-        unsigned int nr_ranges;
         unsigned int i;
         int ret;
 
@@ -368,23 +365,13 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
         pfc->gpio = chip;
 
         /* Register the GPIO to pin mappings. */
-        if (pfc->info->ranges == NULL) {
-                def_range.begin = 0;
-                def_range.end = pfc->info->nr_pins - 1;
-                ranges = &def_range;
-                nr_ranges = 1;
-        } else {
-                ranges = pfc->info->ranges;
-                nr_ranges = pfc->info->nr_ranges;
-        }
-
-        for (i = 0; i < nr_ranges; ++i) {
-                const struct pinmux_range *range = &ranges[i];
+        for (i = 0; i < pfc->nr_ranges; ++i) {
+                const struct sh_pfc_pin_range *range = &pfc->ranges[i];
 
                 ret = gpiochip_add_pin_range(&chip->gpio_chip,
                                              dev_name(pfc->dev),
-                                             range->begin, range->begin,
-                                             range->end - range->begin + 1);
+                                             range->start, range->start,
+                                             range->end - range->start + 1);
                 if (ret < 0)
                         return ret;
         }
diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a73a4.c b/drivers/pinctrl/sh-pfc/pfc-r8a73a4.c
index 04ecb5e9e18e..05d96ae36fca 100644
--- a/drivers/pinctrl/sh-pfc/pfc-r8a73a4.c
+++ b/drivers/pinctrl/sh-pfc/pfc-r8a73a4.c
@@ -1398,20 +1398,6 @@ static struct sh_pfc_pin pinmux_pins[] = {
         R8A73A4_PIN_IO_PU_PD(328), R8A73A4_PIN_IO_PU_PD(329),
 };
 
-static const struct pinmux_range pinmux_ranges[] = {
-        {.begin = 0, .end = 30,},
-        {.begin = 32, .end = 40,},
-        {.begin = 64, .end = 85,},
-        {.begin = 96, .end = 126,},
-        {.begin = 128, .end = 134,},
-        {.begin = 160, .end = 178,},
-        {.begin = 192, .end = 222,},
-        {.begin = 224, .end = 250,},
-        {.begin = 256, .end = 283,},
-        {.begin = 288, .end = 308,},
-        {.begin = 320, .end = 329,},
-};
-
 /* - IRQC ------------------------------------------------------------------- */
 #define IRQC_PINS_MUX(pin, irq_mark)                            \
 static const unsigned int irqc_irq##irq_mark##_pins[] = {       \
@@ -2756,9 +2742,6 @@ const struct sh_pfc_soc_info r8a73a4_pinmux_info = {
         .pins = pinmux_pins,
         .nr_pins = ARRAY_SIZE(pinmux_pins),
 
-        .ranges = pinmux_ranges,
-        .nr_ranges = ARRAY_SIZE(pinmux_ranges),
-
         .groups = pinmux_groups,
         .nr_groups = ARRAY_SIZE(pinmux_groups),
         .functions = pinmux_functions,
diff --git a/drivers/pinctrl/sh-pfc/pfc-sh73a0.c b/drivers/pinctrl/sh-pfc/pfc-sh73a0.c
index acf83921d75b..1f4dbe45737a 100644
--- a/drivers/pinctrl/sh-pfc/pfc-sh73a0.c
+++ b/drivers/pinctrl/sh-pfc/pfc-sh73a0.c
@@ -1446,13 +1446,6 @@ static struct sh_pfc_pin pinmux_pins[] = {
         SH73A0_PIN_O(309),
 };
 
-static const struct pinmux_range pinmux_ranges[] = {
-        {.begin = 0, .end = 118,},
-        {.begin = 128, .end = 164,},
-        {.begin = 192, .end = 282,},
-        {.begin = 288, .end = 309,},
-};
-
 /* Pin numbers for pins without a corresponding GPIO port number are computed
  * from the row and column numbers with a 1000 offset to avoid collisions with
  * GPIO port numbers.
@@ -3894,8 +3887,6 @@ const struct sh_pfc_soc_info sh73a0_pinmux_info = {
 
         .pins = pinmux_pins,
         .nr_pins = ARRAY_SIZE(pinmux_pins),
-        .ranges = pinmux_ranges,
-        .nr_ranges = ARRAY_SIZE(pinmux_ranges),
         .groups = pinmux_groups,
         .nr_groups = ARRAY_SIZE(pinmux_groups),
         .functions = pinmux_functions,
diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index 314255d79bff..8649ec3910a3 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -587,22 +587,9 @@ static const struct pinconf_ops sh_pfc_pinconf_ops = {
 /* PFC ranges -> pinctrl pin descs */
 static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
 {
-        const struct pinmux_range *ranges;
-        struct pinmux_range def_range;
-        unsigned int nr_ranges;
-        unsigned int nr_pins;
         unsigned int i;
 
-        if (pfc->info->ranges == NULL) {
-                def_range.begin = 0;
-                def_range.end = pfc->info->nr_pins - 1;
-                ranges = &def_range;
-                nr_ranges = 1;
-        } else {
-                ranges = pfc->info->ranges;
-                nr_ranges = pfc->info->nr_ranges;
-        }
-
+        /* Allocate and initialize the pins and configs arrays. */
         pmx->pins = devm_kzalloc(pfc->dev,
                                  sizeof(*pmx->pins) * pfc->info->nr_pins,
                                  GFP_KERNEL);
@@ -615,32 +602,24 @@ static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
         if (unlikely(!pmx->configs))
                 return -ENOMEM;
 
-        for (i = 0, nr_pins = 0; i < nr_ranges; ++i) {
-                const struct pinmux_range *range = &ranges[i];
-                unsigned int number;
+        for (i = 0; i < pfc->info->nr_pins; ++i) {
+                const struct sh_pfc_pin *info = &pfc->info->pins[i];
+                struct sh_pfc_pin_config *cfg = &pmx->configs[i];
+                struct pinctrl_pin_desc *pin = &pmx->pins[i];
 
-                for (number = range->begin; number <= range->end;
-                     number++, nr_pins++) {
-                        struct sh_pfc_pin_config *cfg = &pmx->configs[nr_pins];
-                        struct pinctrl_pin_desc *pin = &pmx->pins[nr_pins];
-                        const struct sh_pfc_pin *info =
-                                &pfc->info->pins[nr_pins];
-
-                        pin->number = number;
-                        pin->name = info->name;
-                        cfg->type = PINMUX_TYPE_NONE;
-                }
+                /* If the pin number is equal to -1 all pins are considered */
+                pin->number = info->pin != (u16)-1 ? info->pin : i;
+                pin->name = info->name;
+                cfg->type = PINMUX_TYPE_NONE;
         }
 
-        pfc->nr_gpio_pins = ranges[nr_ranges-1].end + 1;
-
-        return nr_ranges;
+        return 0;
 }
 
 int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
 {
         struct sh_pfc_pinctrl *pmx;
-        int nr_ranges;
+        int ret;
 
         pmx = devm_kzalloc(pfc->dev, sizeof(*pmx), GFP_KERNEL);
         if (unlikely(!pmx))
@@ -649,9 +628,9 @@ int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
         pmx->pfc = pfc;
         pfc->pinctrl = pmx;
 
-        nr_ranges = sh_pfc_map_pins(pfc, pmx);
-        if (unlikely(nr_ranges < 0))
-                return nr_ranges;
+        ret = sh_pfc_map_pins(pfc, pmx);
+        if (ret < 0)
+                return ret;
 
         pmx->pctl_desc.name = DRV_NAME;
         pmx->pctl_desc.owner = THIS_MODULE;
diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h
index 839e69548a2c..2469b35cfda7 100644
--- a/drivers/pinctrl/sh-pfc/sh_pfc.h
+++ b/drivers/pinctrl/sh-pfc/sh_pfc.h
@@ -125,8 +125,6 @@ struct sh_pfc_soc_info {
 
         const struct sh_pfc_pin *pins;
         unsigned int nr_pins;
-        const struct pinmux_range *ranges;
-        unsigned int nr_ranges;
         const struct sh_pfc_pin_group *groups;
         unsigned int nr_groups;
         const struct sh_pfc_function *functions;