staging: mt7621-gpio: remove no more necessary PIN_MASK macro

PIN_MASK macro was being used because of the fact we were only
using one interrupt controller for all of the gpio chips. This
has been changed to use one per gpio chip and each has 32 irqs.
Because of this this macro is not needed anymore. Use BIT macro
instead.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-gpio/gpio-mt7621.c

@@ -15,7 +15,6 @@
 
 #define MTK_BANK_CNT		3
 #define MTK_BANK_WIDTH		32
-#define PIN_MASK(nr)		(1UL << ((nr % MTK_BANK_WIDTH)))
 
 #define GPIO_BANK_WIDE	0x04
 #define GPIO_REG_CTRL	0x00
@@ -133,10 +132,10 @@ mediatek_gpio_irq_unmask(struct irq_data *d)
 	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
 	high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
 	low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
-	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (PIN_MASK(pin) & rg->rising));
-	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (PIN_MASK(pin) & rg->falling));
-	mtk_gpio_w32(rg, GPIO_REG_HLVL, high | (PIN_MASK(pin) & rg->hlevel));
-	mtk_gpio_w32(rg, GPIO_REG_LLVL, low | (PIN_MASK(pin) & rg->llevel));
+	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(pin) & rg->rising));
+	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(pin) & rg->falling));
+	mtk_gpio_w32(rg, GPIO_REG_HLVL, high | (BIT(pin) & rg->hlevel));
+	mtk_gpio_w32(rg, GPIO_REG_LLVL, low | (BIT(pin) & rg->llevel));
 	spin_unlock_irqrestore(&rg->lock, flags);
 }
 
@@ -157,10 +156,10 @@ mediatek_gpio_irq_mask(struct irq_data *d)
 	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
 	high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
 	low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
-	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~PIN_MASK(pin));
-	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~PIN_MASK(pin));
-	mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~PIN_MASK(pin));
-	mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~PIN_MASK(pin));
+	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(pin));
+	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(pin));
+	mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
+	mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
 	spin_unlock_irqrestore(&rg->lock, flags);
 }
 
@@ -170,7 +169,7 @@ mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct mtk_gc *rg = to_mediatek_gpio(gc);
 	int pin = d->hwirq;
-	u32 mask = PIN_MASK(pin);
+	u32 mask = BIT(pin);
 
 	if (!rg)
 		return -1;