Commit 04a993fe authored by Alexander Graf's avatar Alexander Graf Committed by Tom Rini
Browse files

bcm2835_gpio: Implement GPIOF_FUNC

So far we could only tell the gpio framework that a GPIO was mapped as input or
output, not as alternative function.

This patch adds support for determining whether a function is mapped as
Signed-off-by: default avatarAlexander Graf <>
Reviewed-by: default avatarSimon Glass <>
Acked-by: default avatarStephen Warren <>
parent c0afcb58
......@@ -66,4 +66,6 @@ struct bcm2835_gpio_platdata {
unsigned long base;
int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned gpio);
#endif /* _BCM2835_GPIO_H_ */
......@@ -44,15 +44,6 @@ static int bcm2835_gpio_direction_output(struct udevice *dev, unsigned gpio,
return 0;
static bool bcm2835_gpio_is_output(const struct bcm2835_gpios *gpios, int gpio)
u32 val;
val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
val &= BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio);
return val ? true : false;
static int bcm2835_get_value(const struct bcm2835_gpios *gpios, unsigned gpio)
unsigned val;
......@@ -81,15 +72,28 @@ static int bcm2835_gpio_set_value(struct udevice *dev, unsigned gpio,
return 0;
static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned gpio)
struct bcm2835_gpios *gpios = dev_get_priv(dev);
u32 val;
val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
int funcid = bcm2835_gpio_get_func_id(dev, offset);
/* GPIOF_FUNC is not implemented yet */
if (bcm2835_gpio_is_output(gpios, offset))
switch (funcid) {
case BCM2835_GPIO_INPUT:
return GPIOF_FUNC;
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