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1256e4f9e0
zephyr/include
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Marcus Shawcroft 1256e4f9e0 gpio: Support drive strength configuration. 
Provide a mechanism to configure different pin drive strengths on
hardware with that capability.

Configuration flags are provided to select each of DFLT, ALT and
DISCONNECT drive strengths independently for low and high outputs.

This provides sufficient flexbility to configure all of the drive
strength capability in at least nRF5 hardware.

The flags are chosen such that in the absence of a drive strength
flag a driver selects DFLT drive strength.  This ensures that an
existing application that omits a flag continues to observe the
preexisting behaviour.

The behaviour of the drive strength flags is documented such that a
driver for hardware that does not support a particular drive strength
will simply defalt to the standard drive strength for that hardware.

Change-Id: I9894cc5e739a1899a4ecf795f2a5980b95b0c7a0
Signed-off-by: Marcus Shawcroft <marcus.shawcroft@arm.com>
2017-01-25 08:47:21 +00:00
..
arch arm: cmsis: Convert relocate_vector_table to use CMSIS 2017-01-23 15:15:55 -06:00
bluetooth license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
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drivers spi: k64: Remove the k64 spi driver 2017-01-23 15:15:54 -06:00
fs license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
linker build: remove obsolete sections from linker scripts 2017-01-18 18:47:17 +00:00
logging kernel_event_logger: add additional function prototypes 2017-01-19 20:17:29 +00:00
misc license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
net net: context: Add status to connect callback 2017-01-20 16:23:21 +02:00
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toolchain license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
usb usb: Add end-point stall APIs and flow control APIS 2016-11-09 02:45:46 +00:00
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flash.h license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
fs.h license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
gpio.h gpio: Support drive strength configuration. 2017-01-25 08:47:21 +00:00
i2c.h license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
init.h license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00
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kernel.h kernel/arch: streamline thread user options 2017-01-24 13:34:50 +00:00
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zephyr.h license: Replace Apache boilerplate with SPDX tag 2017-01-19 03:50:58 +00:00