2017-03-17 17:44:20

by Ralph Sennhauser

Subject: [PATCH 1/1] gpio: mvebu: use BIT macro instead of bit shifting

Use the BIT macro instead of explicitly shifting bits for some added
clarity.

Signed-off-by: Ralph Sennhauser <[email protected]>
---

Hi Linus,

To use the BIT macro for the pwm-fan addition it would be nice to have the
rest converted before hand. This patch takes care of that.

Ralph


drivers/gpio/gpio-mvebu.c | 33 +++++++++++++++++----------------
1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index 029f43c..fae4db6 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -45,6 +45,7 @@
#include <linux/clk.h>
#include <linux/pinctrl/consumer.h>
#include <linux/irqchip/chained_irq.h>
+#include <linux/bitops.h>

/*
* GPIO unit register offsets.
@@ -191,9 +192,9 @@ static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value)
spin_lock_irqsave(&mvchip->lock, flags);
u = readl_relaxed(mvebu_gpioreg_out(mvchip));
if (value)
- u |= 1 << pin;
+ u |= BIT(pin);
else
- u &= ~(1 << pin);
+ u &= ~BIT(pin);
writel_relaxed(u, mvebu_gpioreg_out(mvchip));
spin_unlock_irqrestore(&mvchip->lock, flags);
}
@@ -203,7 +204,7 @@ static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin)
struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
u32 u;

- if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
+ if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & BIT(pin)) {
u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
} else {
@@ -223,9 +224,9 @@ static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin,
spin_lock_irqsave(&mvchip->lock, flags);
u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
if (value)
- u |= 1 << pin;
+ u |= BIT(pin);
else
- u &= ~(1 << pin);
+ u &= ~BIT(pin);
writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
spin_unlock_irqrestore(&mvchip->lock, flags);
}
@@ -247,7 +248,7 @@ static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)

spin_lock_irqsave(&mvchip->lock, flags);
u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
- u |= 1 << pin;
+ u |= BIT(pin);
writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
spin_unlock_irqrestore(&mvchip->lock, flags);

@@ -275,7 +276,7 @@ static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,

spin_lock_irqsave(&mvchip->lock, flags);
u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
- u &= ~(1 << pin);
+ u &= ~BIT(pin);
writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
spin_unlock_irqrestore(&mvchip->lock, flags);

@@ -392,7 +393,7 @@ static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)

pin = d->hwirq;

- u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
+ u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & BIT(pin);
if (!u)
return -EINVAL;

@@ -412,13 +413,13 @@ static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
case IRQ_TYPE_EDGE_RISING:
case IRQ_TYPE_LEVEL_HIGH:
u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
- u &= ~(1 << pin);
+ u &= ~BIT(pin);
writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
break;
case IRQ_TYPE_EDGE_FALLING:
case IRQ_TYPE_LEVEL_LOW:
u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
- u |= 1 << pin;
+ u |= BIT(pin);
writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
break;
case IRQ_TYPE_EDGE_BOTH: {
@@ -431,10 +432,10 @@ static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
* set initial polarity based on current input level
*/
u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
- if (v & (1 << pin))
- u |= 1 << pin; /* falling */
+ if (v & BIT(pin))
+ u |= BIT(pin); /* falling */
else
- u &= ~(1 << pin); /* rising */
+ u &= ~BIT(pin); /* rising */
writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
break;
}
@@ -464,7 +465,7 @@ static void mvebu_gpio_irq_handler(struct irq_desc *desc)

irq = irq_find_mapping(mvchip->domain, i);

- if (!(cause & (1 << i)))
+ if (!(cause & BIT(i)))
continue;

type = irq_get_trigger_type(irq);
@@ -473,7 +474,7 @@ static void mvebu_gpio_irq_handler(struct irq_desc *desc)
u32 polarity;

polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
- polarity ^= 1 << i;
+ polarity ^= BIT(i);
writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
}

@@ -510,7 +511,7 @@ static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
if (!label)
continue;

- msk = 1 << i;
+ msk = BIT(i);
is_out = !(io_conf & msk);

seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
--
2.10.2

2017-03-23 09:22:21

by Linus Walleij

Subject: Re: [PATCH 1/1] gpio: mvebu: use BIT macro instead of bit shifting

On Fri, Mar 17, 2017 at 6:44 PM, Ralph Sennhauser
<[email protected]> wrote:

> Use the BIT macro instead of explicitly shifting bits for some added
> clarity.
>
> Signed-off-by: Ralph Sennhauser <[email protected]>

Patch applied.

Yours,
Linus Walleij