[PATCH 8/9] gpio: mxc: use BIT() macro for single-bit operations

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@xxxxxxx>

Replace open-coded '1 << n' shifts with the BIT() macro throughout
the driver for consistency and to avoid potential signed-shift issues
when the bit index is 31 (1 << 31 is implementation-defined for
signed int).

No functional change.

Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
 drivers/gpio/gpio-mxc.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 18ff33a0abfb..bf1207f30460 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -174,7 +174,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 	int edge;
 	void __iomem *reg = port->base;
 
-	port->both_edges &= ~(1 << gpio_idx);
+	port->both_edges &= ~BIT(gpio_idx);
 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		edge = GPIO_INT_RISE_EDGE;
@@ -194,7 +194,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 				edge = GPIO_INT_HIGH_LEV;
 				pr_debug("mxc: set GPIO %d to high trigger\n", gpio_idx);
 			}
-			port->both_edges |= 1 << gpio_idx;
+			port->both_edges |= BIT(gpio_idx);
 		}
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
@@ -211,10 +211,10 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 		if (GPIO_EDGE_SEL >= 0) {
 			val = readl(port->base + GPIO_EDGE_SEL);
 			if (edge == GPIO_INT_BOTH_EDGES)
-				writel(val | (1 << gpio_idx),
+				writel(val | BIT(gpio_idx),
 				       port->base + GPIO_EDGE_SEL);
 			else
-				writel(val & ~(1 << gpio_idx),
+				writel(val & ~BIT(gpio_idx),
 				       port->base + GPIO_EDGE_SEL);
 		}
 
@@ -224,7 +224,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 			writel(val | field_prep(MXC_ICR_MASK(gpio_idx), edge), reg);
 		}
 
-		writel(1 << gpio_idx, port->base + GPIO_ISR);
+		writel(BIT(gpio_idx), port->base + GPIO_ISR);
 		port->pad_type[gpio_idx] = type;
 	}
 
@@ -263,12 +263,12 @@ static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
 	while (irq_stat != 0) {
 		int irqoffset = fls(irq_stat) - 1;
 
-		if (port->both_edges & (1 << irqoffset))
+		if (port->both_edges & BIT(irqoffset))
 			mxc_flip_edge(port, irqoffset);
 
 		generic_handle_domain_irq(port->domain, irqoffset);
 
-		irq_stat &= ~(1 << irqoffset);
+		irq_stat &= ~BIT(irqoffset);
 	}
 }
 

-- 
2.51.0