Lukas Wunner eec1d566cd gpio: Introduce ->get_multiple callback ... SPI-attached GPIO controllers typically read out all inputs in one go. If callers desire the values of multipe inputs, ideally a single readout should take place to return the desired values. However the current driver API only offers a ->get callback but no ->get_multiple (unlike ->set_multiple, which is present). Thus, to read multiple inputs, a full readout needs to be performed for every single value (barring driver-internal caching), which is inefficient. In fact, the lack of a ->get_multiple callback has been bemoaned repeatedly by the gpio subsystem maintainer: http://www.spinics.net/lists/linux-gpio/msg10571.html http://www.spinics.net/lists/devicetree/msg121734.html Introduce the missing callback. Add corresponding consumer functions such as gpiod_get_array_value(). Amend linehandle_ioctl() to take advantage of the newly added infrastructure. Update the documentation. Cc: Rojhalat Ibrahim <imr@rtschenk.de> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>		2017-10-19 22:32:39 +02:00
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consumer.h	gpio: Introduce ->get_multiple callback	2017-10-19 22:32:39 +02:00
driver.h	gpio: Introduce ->get_multiple callback	2017-10-19 22:32:39 +02:00
gpio-reg.h	gpio: gpio-reg: add irq mapping for gpio-reg users	2017-03-24 14:05:00 +01:00
machine.h	gpio: add gpio_add_lookup_tables() to add several tables at once	2017-08-23 09:16:35 +02:00