From 651827c0fc3d91e0a6f2170890a11bc77557ee2e Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Sat, 30 Jan 2016 16:37:45 -0700
Subject: [PATCH] tegra: gpio: Show the GPIO value for outputs
The tegra GPIO controller has two ways of reading the value of a GPIO. It
can supply the 'input' value (which is the value read from the pin) and the
'output' value (which is the value being driven from the pin. With a GPIO
set to output mode, the 'input' value is always low which is not very
useful.
This has the unfortunate result that setting a GPIO high still leaves it
showing as low in the 'gpio status' command.
Adjust the driver to check which direction the GPIO is set to, then read
the value from the appropriate register: 'input' for input GPIOs, 'output'
for output GPIOs.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
---
drivers/gpio/tegra_gpio.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/tegra_gpio.c b/drivers/gpio/tegra_gpio.c
index 8e880e276f..5a031159ca 100644
--- a/drivers/gpio/tegra_gpio.c
+++ b/drivers/gpio/tegra_gpio.c
@@ -177,7 +177,10 @@ static int tegra_gpio_get_value(struct udevice *dev, unsigned offset)
debug("%s: pin = %d (port %d:bit %d)\n", __func__,
gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio));
- val = readl(&state->bank->gpio_in[GPIO_PORT(gpio)]);
+ if (get_direction(gpio) == DIRECTION_INPUT)
+ val = readl(&state->bank->gpio_in[GPIO_PORT(gpio)]);
+ else
+ val = readl(&state->bank->gpio_out[GPIO_PORT(gpio)]);
return (val >> GPIO_BIT(gpio)) & 1;
}
--
2.39.5