[PATCH 8/8] gpio: stmpe: configure GPIO as output by default

patrice.chotard
2016-04-19T12:22:21Z

From: Patrice Chotard <patrice.chotard@st.com>

Configures all GPIOs as output, in order to minimize power
consumption when GPIOs are unused.

Signed-off-by: Amelie DELAUNAY <amelie.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
---
drivers/gpio/gpio-stmpe.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 45e5b92..80c6ae6 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -410,7 +410,7 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
struct device_node *np = pdev->dev.of_node;
struct stmpe_gpio *stmpe_gpio;
- int ret;
+ int ret, i;
int irq = 0;

irq = platform_get_irq(pdev, 0);
@@ -475,6 +475,10 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
NULL);
}

+ /* To minimize power consumption, configure unused GPIOs as outputs */
+ for (i = 0; i < stmpe_gpio->chip.ngpio; i++)
+ stmpe_gpio_direction_output(&stmpe_gpio->chip, i, 0);
+
platform_set_drvdata(pdev, stmpe_gpio);

return 0;
--
1.9.1