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authorSimon Glass <sjg@chromium.org>2015-01-05 20:05:29 -0700
committerSimon Glass <sjg@chromium.org>2015-01-29 17:09:51 -0700
commit3669e0e759118fed3d371e2427b4b47d3969bfd0 (patch)
tree2f9831f33ac579dda2719ce5cc8bcbcd75c96f24 /drivers/mmc/sunxi_mmc.c
parent0dac4d51f50e9252dbc00075cf65eeba57017926 (diff)
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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 'drivers/mmc/sunxi_mmc.c')
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