sh-pfc: Simplify the sh_pfc_gpio_is_pin() logic

The function is guaranteed to be called with a gpio number smaller than
nr_pins. The condition can the be simplified, and the function inlined.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/sh-pfc/core.c

@@ -89,12 +89,6 @@ static int sh_pfc_enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r)
 	return 1;
 }
 
-static bool sh_pfc_gpio_is_pin(struct sh_pfc *pfc, unsigned int gpio)
-{
-	return (gpio < pfc->info->nr_pins) &&
-	       (pfc->info->pins[gpio].enum_id != 0);
-}
-
 static unsigned long sh_pfc_read_raw_reg(void __iomem *mapped_reg,
 					 unsigned long reg_width)
 {
@@ -226,15 +220,12 @@ static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
 	sh_pfc_write_raw_reg(mapped_reg, crp->reg_width, data);
 }
 
-static int sh_pfc_setup_data_reg(struct sh_pfc *pfc, unsigned gpio)
+static void sh_pfc_setup_data_reg(struct sh_pfc *pfc, unsigned gpio)
 {
 	struct sh_pfc_pin *gpiop = &pfc->info->pins[gpio];
 	struct pinmux_data_reg *data_reg;
 	int k, n;
 
-	if (!sh_pfc_gpio_is_pin(pfc, gpio))
-		return -1;
-
 	k = 0;
 	while (1) {
 		data_reg = pfc->info->data_regs + k;
@@ -250,15 +241,13 @@ static int sh_pfc_setup_data_reg(struct sh_pfc *pfc, unsigned gpio)
 				gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT);
 				gpiop->flags &= ~PINMUX_FLAG_DBIT;
 				gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT);
-				return 0;
+				return;
 			}
 		}
 		k++;
 	}
 
 	BUG();
-
-	return -1;
 }
 
 static void sh_pfc_setup_data_regs(struct sh_pfc *pfc)
@@ -266,8 +255,12 @@ static void sh_pfc_setup_data_regs(struct sh_pfc *pfc)
 	struct pinmux_data_reg *drp;
 	int k;
 
-	for (k = 0; k < pfc->info->nr_pins; k++)
+	for (k = 0; k < pfc->info->nr_pins; k++) {
+		if (pfc->info->pins[k].enum_id == 0)
+			continue;
+
 		sh_pfc_setup_data_reg(pfc, k);
+	}
 
 	k = 0;
 	while (1) {
@@ -282,20 +275,16 @@ static void sh_pfc_setup_data_regs(struct sh_pfc *pfc)
 	}
 }
 
-int sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio,
-			struct pinmux_data_reg **drp, int *bitp)
+void sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio,
+			 struct pinmux_data_reg **drp, int *bitp)
 {
 	struct sh_pfc_pin *gpiop = &pfc->info->pins[gpio];
 	int k, n;
 
-	if (!sh_pfc_gpio_is_pin(pfc, gpio))
-		return -1;
-
 	k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT;
 	n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT;
 	*drp = pfc->info->data_regs + k;
 	*bitp = n;
-	return 0;
 }
 
 static int sh_pfc_get_config_reg(struct sh_pfc *pfc, pinmux_enum_t enum_id,

drivers/pinctrl/sh-pfc/core.h

@@ -47,8 +47,8 @@ int sh_pfc_unregister_pinctrl(struct sh_pfc *pfc);
 int sh_pfc_read_bit(struct pinmux_data_reg *dr, unsigned long in_pos);
 void sh_pfc_write_bit(struct pinmux_data_reg *dr, unsigned long in_pos,
 		      unsigned long value);
-int sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio,
-			struct pinmux_data_reg **drp, int *bitp);
+void sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio,
+			 struct pinmux_data_reg **drp, int *bitp);
 int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
 		      int cfg_mode);
 

drivers/pinctrl/sh-pfc/gpio.c

@@ -42,6 +42,11 @@ static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
 
 static int gpio_pin_request(struct gpio_chip *gc, unsigned offset)
 {
+	struct sh_pfc *pfc = gpio_to_pfc(gc);
+
+	if (pfc->info->pins[offset].enum_id == 0)
+		return -EINVAL;
+
 	return pinctrl_request_gpio(offset);
 }
 
@@ -52,12 +57,10 @@ static void gpio_pin_free(struct gpio_chip *gc, unsigned offset)
 
 static void gpio_pin_set_value(struct sh_pfc *pfc, unsigned offset, int value)
 {
-	struct pinmux_data_reg *dr = NULL;
-	int bit = 0;
-
-	if (sh_pfc_get_data_reg(pfc, offset, &dr, &bit) != 0)
-		BUG();
+	struct pinmux_data_reg *dr;
+	int bit;
 
+	sh_pfc_get_data_reg(pfc, offset, &dr, &bit);
 	sh_pfc_write_bit(dr, bit, value);
 }
 
@@ -77,12 +80,10 @@ static int gpio_pin_direction_output(struct gpio_chip *gc, unsigned offset,
 static int gpio_pin_get(struct gpio_chip *gc, unsigned offset)
 {
 	struct sh_pfc *pfc = gpio_to_pfc(gc);
-	struct pinmux_data_reg *dr = NULL;
-	int bit = 0;
-
-	if (sh_pfc_get_data_reg(pfc, offset, &dr, &bit) != 0)
-		return -EINVAL;
+	struct pinmux_data_reg *dr;
+	int bit;
 
+	sh_pfc_get_data_reg(pfc, offset, &dr, &bit);
 	return sh_pfc_read_bit(dr, bit);
 }