pinctrl: sh-pfc: Return pinconf with arguments in packed format

The pinconf-generic code expects configurations with arguments to be
returned in a packed format in order to be displayed properly by
pinconf_generic_dump_one().

Reading /sys/kernel/debug/pinctrl/e6060000.pfc/pinconf-pins on
r8a7795/salvator-x now shows:

    pin 101 (GP_3_5): output drive strength (9 mA), pin power source (3300 selector)

Instead of:

    pin 101 (GP_3_5): output drive strength (0 mA), pin power source (0 selector)
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/pinctrl/sh-pfc/pinctrl.c

@@ -596,6 +596,7 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
 	struct sh_pfc *pfc = pmx->pfc;
 	enum pin_config_param param = pinconf_to_config_param(*config);
 	unsigned long flags;
+	unsigned int arg;
 
 	if (!sh_pfc_pinconf_validate(pfc, _pin, param))
 		return -ENOTSUPP;
@@ -616,7 +617,7 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
 		if (bias != param)
 			return -EINVAL;
 
-		*config = 0;
+		arg = 0;
 		break;
 	}
 
@@ -627,7 +628,7 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
 		if (ret < 0)
 			return ret;
 
-		*config = ret;
+		arg = ret;
 		break;
 	}
 
@@ -646,7 +647,7 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
 		val = sh_pfc_read_reg(pfc, pocctrl, 32);
 		spin_unlock_irqrestore(&pfc->lock, flags);
 
-		*config = (val & BIT(bit)) ? 3300 : 1800;
+		arg = (val & BIT(bit)) ? 3300 : 1800;
 		break;
 	}
 
@@ -654,6 +655,7 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
 		return -ENOTSUPP;
 	}
 
+	*config = pinconf_to_config_packed(param, arg);
 	return 0;
 }