[PATCH v5 13/13] 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.

Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
 drivers/gpio/gpio-mxc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 97147a5d747b..4140fb2359c8 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -260,17 +260,17 @@ 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);
 		}
 
 		if (edge != GPIO_INT_BOTH_EDGES)
 			icr_update_edge(port, gpio_idx, edge);
 
-		writel(1 << gpio_idx, port->base + GPIO_ISR);
+		writel(BIT(gpio_idx), port->base + GPIO_ISR);
 		port->pad_type[gpio_idx] = type;
 	}
 
@@ -309,7 +309,7 @@ static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
 
 		generic_handle_domain_irq(port->domain, irqoffset);
 
-		irq_stat &= ~(1 << irqoffset);
+		irq_stat &= ~BIT(irqoffset);
 	}
 }
 

-- 
2.51.0