[U-Boot] [PATCH 1/2] bcm2835_gpio: Implement GPIOF_FUNC

[Alexander Graf]

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
alternative.

Signed-off-by: Alexander Graf <agraf at suse.de>
---
 arch/arm/mach-bcm283x/include/mach/gpio.h |  2 ++
 drivers/gpio/bcm2835_gpio.c               | 30 +++++++++++++++++-------------
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-bcm283x/include/mach/gpio.h b/arch/arm/mach-bcm283x/include/mach/gpio.h
index e6e5d16..b2df75a 100644
--- a/arch/arm/mach-bcm283x/include/mach/gpio.h
+++ b/arch/arm/mach-bcm283x/include/mach/gpio.h
@@ -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_ */
diff --git a/drivers/gpio/bcm2835_gpio.c b/drivers/gpio/bcm2835_gpio.c
index fbc641d..8b88d79 100644
--- a/drivers/gpio/bcm2835_gpio.c
+++ b/drivers/gpio/bcm2835_gpio.c
@@ -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_OUTPUT:
 		return GPIOF_OUTPUT;
-	else
+	case BCM2835_GPIO_INPUT:
 		return GPIOF_INPUT;
+	default:
+		return GPIOF_FUNC;
+	}
 }
 
 
-- 
1.8.5.6