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tegra: Add gpio_output_open_drain() function

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This patch adds a function to configure an output GPIO with the
PINMUX_OPEN_DRAIN flag set, such as is necessary for some of the DD
class GPIOs. It requires some shifting around of the GPIO code plumbing
but doesn't change the existing external interfaces.

BUG=None
TEST=None

Change-Id: Iac294aeb8705834104c8351849b37d07759c3dae
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174650
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Julius Werner 2013-10-24 17:24:58 -07:00 • committed by chrome-internal-fetch
commit bc1c289268
2 changed files with 14 additions and 6 deletions
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6
src/soc/nvidia/tegra/gpio.c
View file

@ -36,15 +36,13 @@ void __gpio_input(gpio_t gpio, u32 pull)
pinmux_set_config(gpio >> GPIO_PINMUX_SHIFT, pinmux_config);
}
void gpio_output(gpio_t gpio, int value)
void __gpio_output(gpio_t gpio, int value, u32 od)
{
/* TODO: Set OPEN_DRAIN based on what pin it is? */
gpio_set_int_enable(gpio, 0);
gpio_set_out_value(gpio, value);
gpio_set_out_enable(gpio, 1);
gpio_set_mode(gpio, GPIO_MODE_GPIO);
pinmux_set_config(gpio >> GPIO_PINMUX_SHIFT, PINMUX_PULL_NONE);
pinmux_set_config(gpio >> GPIO_PINMUX_SHIFT, PINMUX_PULL_NONE | od);
}
enum {

14
src/soc/nvidia/tegra/gpio.h
View file

@ -31,10 +31,20 @@ typedef u32 gpio_t;
#define GPIO(name) ((gpio_t)(GPIO_##name##_INDEX | \
(PINMUX_GPIO_##name << GPIO_PINMUX_SHIFT)))
void __gpio_output(gpio_t gpio, int value, u32 open_drain);
void __gpio_input(gpio_t gpio, u32 pull);
/* Higher level function wrappers for common GPIO configurations. */
void gpio_output(gpio_t gpio, int value);
void __gpio_input(gpio_t gpio, u32 pull);
static inline void gpio_output(gpio_t gpio, int value)
{
__gpio_output(gpio, value, 0);
}
static inline void gpio_output_open_drain(gpio_t gpio, int value)
{
__gpio_output(gpio, value, PINMUX_OPEN_DRAIN);
}
static inline void gpio_input(gpio_t gpio)
{