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>

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
 	 */

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;

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;
 	}

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,

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,

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;

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;