Hello, This short series enables GPIO state persistence across controller resets, modifying gpiolib to expose control of the behaviour and providing an initial implementation in the Aspeed GPIO controller.
This is a follow-up to the initial RFC series[1], which had some undesirable features (and bugs). >From the RFC, I've: 1. Dropped the idea of distinguishing between sleep and reset cases[2] 2. Changed the default behaviour from transitory to persistent (must explicitly request transitory behaviour for controllers supporting reset tolerance)[3] 3. Dropped the ability for userspace to configure whether or not the exported GPIO is persistent[4][5] On point 2, whilst the patch modifying the sysfs interface ABI no-longer lives, gpiolib-sysfs still requires modification to provide consistent behaviour with the chardev interface in providing a default-persistent GPIO on export. Regarding point 3, I figured this is something we can add later once there's been some discussion on how much of a good idea it is. As some of the capabilities in the RFC have been dropped, I've squashed the gpiolib support into a single patch as it's not really that complex. Hopefully that addresses the feedback on the RFC. Please review! Andrew [1] https://www.spinics.net/lists/devicetree/msg199559.html [2] https://www.spinics.net/lists/devicetree/msg199566.html [3] https://www.spinics.net/lists/devicetree/msg199574.html [4] https://www.spinics.net/lists/devicetree/msg199568.html [5] https://www.spinics.net/lists/devicetree/msg199569.html Andrew Jeffery (2): gpio: gpiolib: Expand sleep tolerance to include controller reset gpio: aspeed: Add support for reset tolerance drivers/gpio/gpio-aspeed.c | 39 ++++++++++++++++++++-- drivers/gpio/gpiolib-of.c | 6 ++-- drivers/gpio/gpiolib-sysfs.c | 14 +++++--- drivers/gpio/gpiolib.c | 58 ++++++++++++++++++++++++++++++--- drivers/gpio/gpiolib.h | 2 +- include/dt-bindings/gpio/gpio.h | 6 ++-- include/linux/gpio/consumer.h | 8 +++++ include/linux/gpio/machine.h | 4 +-- include/linux/of_gpio.h | 2 +- include/linux/pinctrl/pinconf-generic.h | 2 ++ 10 files changed, 121 insertions(+), 20 deletions(-) -- 2.11.0
