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author | Simon Glass <sjg@chromium.org> | 2015-01-05 20:05:29 -0700 |
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committer | Simon Glass <sjg@chromium.org> | 2015-01-29 17:09:51 -0700 |
commit | 3669e0e759118fed3d371e2427b4b47d3969bfd0 (patch) | |
tree | 2f9831f33ac579dda2719ce5cc8bcbcd75c96f24 /configs/tcm-bf518_defconfig | |
parent | 0dac4d51f50e9252dbc00075cf65eeba57017926 (diff) |
dm: gpio: Add better functions to request GPIOs
At present U-Boot sort-of supports the standard way of reading GPIOs from
device tree nodes, but the support is incomplete, a bit clunky and only
works for GPIO bindings where #gpio-cells is 2.
Add new functions to request GPIOs, taking full account of the device
tree binding. These permit requesting a GPIO with a simple call like:
gpio_request_by_name(dev, "cd-gpios", 0, &desc, GPIOD_IS_IN);
This will request the GPIO, looking at the device's node which might be
this, for example:
cd-gpios = <&gpio TEGRA_GPIO(B, 3) GPIO_ACTIVE_LOW>;
The GPIO will be set to input mode in this case and polarity will be
honoured by the GPIO calls.
It is also possible to request and free a list of GPIOs.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'configs/tcm-bf518_defconfig')
0 files changed, 0 insertions, 0 deletions