sh-pfc: Add function to retrieve a pin instance from its pin number

This prepares support for sparse pin numbering. The function currently
just performs and indexed lookup in the pins array.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/sh-pfc/core.c

@@ -78,6 +78,11 @@ static void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc,
 	return (void __iomem *)address;
 }
 
+struct sh_pfc_pin *sh_pfc_get_pin(struct sh_pfc *pfc, unsigned int pin)
+{
+	return &pfc->info->pins[pin];
+}
+
 static int sh_pfc_enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r)
 {
 	if (enum_id < r->begin)
@@ -278,7 +283,7 @@ static void sh_pfc_setup_data_regs(struct sh_pfc *pfc)
 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];
+	struct sh_pfc_pin *gpiop = sh_pfc_get_pin(pfc, gpio);
 	int k, n;
 
 	k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT;

drivers/pinctrl/sh-pfc/core.h

@@ -49,6 +49,7 @@ void sh_pfc_write_bit(struct pinmux_data_reg *dr, unsigned long in_pos,
 		      unsigned long value);
 void sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio,
 			 struct pinmux_data_reg **drp, int *bitp);
+struct sh_pfc_pin *sh_pfc_get_pin(struct sh_pfc *pfc, unsigned int pin);
 int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
 		      int cfg_mode);
 

drivers/pinctrl/sh-pfc/gpio.c

@@ -43,8 +43,9 @@ 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);
+	struct sh_pfc_pin *pin = sh_pfc_get_pin(pfc, offset);
 
-	if (pfc->info->pins[offset].enum_id == 0)
+	if (pin->enum_id == 0)
 		return -EINVAL;
 
 	return pinctrl_request_gpio(offset);

drivers/pinctrl/sh-pfc/pinctrl.c

@@ -119,14 +119,15 @@ static void sh_pfc_noop_disable(struct pinctrl_dev *pctldev, unsigned func,
 static int sh_pfc_reconfig_pin(struct sh_pfc *pfc, unsigned offset,
 			       int new_type)
 {
-	unsigned int mark = pfc->info->pins[offset].enum_id;
+	struct sh_pfc_pin *pin = sh_pfc_get_pin(pfc, offset);
+	unsigned int mark = pin->enum_id;
 	unsigned long flags;
 	int pinmux_type;
 	int ret = -EINVAL;
 
 	spin_lock_irqsave(&pfc->lock, flags);
 
-	pinmux_type = pfc->info->pins[offset].flags & PINMUX_FLAG_TYPE;
+	pinmux_type = pin->flags & PINMUX_FLAG_TYPE;
 
 	/*
 	 * See if the present config needs to first be de-configured.
@@ -156,8 +157,8 @@ static int sh_pfc_reconfig_pin(struct sh_pfc *pfc, unsigned offset,
 	if (sh_pfc_config_mux(pfc, mark, new_type, GPIO_CFG_REQ) != 0)
 		goto err;
 
-	pfc->info->pins[offset].flags &= ~PINMUX_FLAG_TYPE;
-	pfc->info->pins[offset].flags |= new_type;
+	pin->flags &= ~PINMUX_FLAG_TYPE;
+	pin->flags |= new_type;
 
 	ret = 0;
 
@@ -173,12 +174,13 @@ static int sh_pfc_gpio_request_enable(struct pinctrl_dev *pctldev,
 {
 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
 	struct sh_pfc *pfc = pmx->pfc;
+	struct sh_pfc_pin *pin = sh_pfc_get_pin(pfc, offset);
 	unsigned long flags;
 	int ret, pinmux_type;
 
 	spin_lock_irqsave(&pfc->lock, flags);
 
-	pinmux_type = pfc->info->pins[offset].flags & PINMUX_FLAG_TYPE;
+	pinmux_type = pin->flags & PINMUX_FLAG_TYPE;
 
 	switch (pinmux_type) {
 	case PINMUX_TYPE_GPIO:
@@ -206,15 +208,15 @@ static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
 {
 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
 	struct sh_pfc *pfc = pmx->pfc;
+	struct sh_pfc_pin *pin = sh_pfc_get_pin(pfc, offset);
 	unsigned long flags;
 	int pinmux_type;
 
 	spin_lock_irqsave(&pfc->lock, flags);
 
-	pinmux_type = pfc->info->pins[offset].flags & PINMUX_FLAG_TYPE;
+	pinmux_type = pin->flags & PINMUX_FLAG_TYPE;
 
-	sh_pfc_config_mux(pfc, pfc->info->pins[offset].enum_id, pinmux_type,
-			  GPIO_CFG_FREE);
+	sh_pfc_config_mux(pfc, pin->enum_id, pinmux_type, GPIO_CFG_FREE);
 
 	spin_unlock_irqrestore(&pfc->lock, flags);
 }
@@ -240,13 +242,14 @@ static const struct pinmux_ops sh_pfc_pinmux_ops = {
 	.gpio_set_direction	= sh_pfc_gpio_set_direction,
 };
 
-static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
+static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
 			      unsigned long *config)
 {
 	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
 	struct sh_pfc *pfc = pmx->pfc;
+	struct sh_pfc_pin *pin = sh_pfc_get_pin(pfc, _pin);
 
-	*config = pfc->info->pins[pin].flags & PINMUX_FLAG_TYPE;
+	*config = pin->flags & PINMUX_FLAG_TYPE;
 
 	return 0;
 }