This is second iteration of the fix of GPIO ACPI library to make it robust against different ACPI specification generations and thus firmwares. Currently GPIO ACPI library provides an API to get a GPIO resources (IO or interrupt) from ACPI tables for the individual drivers. This library has few flaws which makes some devices not working: - the library allows to abuse ACPI by using a _CRS fallback mechanism - the library neglects flags of the resource - the PNP ACPI is not ready for GpioInt() resources for interrupts In this series: - the _CRS fallback is forbidden - the pin configuration follows what firmware wants to - the documentation is updated in order to clarify corner cases - the PNP ACPI is extended to support GpioInt() for interrupts After this series it's possible to use GPIO pins for input (interrupt) which were set as output due to HW reset default is input buffer disabled and BIOS didn't touch that pin at all. It's a crucial functionality for Internet of Things (IoT) open connected boards where user may choose any of available pin for almost any of available function, including GPIO input (interrupt). Current bad behaviour was first reported by Jarkko Nikula few months ago. Jagadish, it would be nice if you can re-test entire series in your environment and give a Tested-by tag. In v2: - add 4 patches to fix an issue with device that takes GpioInt resource - amend documentation - fix several spelling typos - add Mika's and Jarkko's tags - rebase on top of recent linux-next Andy Shevchenko (11): gpiolib: Export gpiod_configure_flags() to internal users gpio: acpi: Align acpi_find_gpio() with DT version gpio: acpi: Do sanity check for GpioInt in acpi_find_gpio() gpio: acpi: Even more tighten up ACPI GPIO lookups gpio: acpi: Synchronize acpi_find_gpio() and acpi_gpio_count() gpio: acpi: Explain how to get GPIO descriptors in ACPI case gpio: acpi: Factor out acpi_gpio_to_gpiod_flags() helper gpio: acpi: Override GPIO initialization flags gpio: acpi: Split out acpi_gpio_get_irq_resource() helper PNP / ACPI: join strings back for better maintenance PNP / ACPI: remove FSF address Jagadish Krishnamoorthy (1): PNP / ACPI: add support for GpioInt resource type Documentation/acpi/gpio-properties.txt | 65 ++++++++++++ drivers/gpio/gpiolib-acpi.c | 185 ++++++++++++++++++++------------- drivers/gpio/gpiolib.c | 10 +- drivers/gpio/gpiolib.h | 17 ++- drivers/pnp/pnpacpi/rsparser.c | 37 ++++--- include/linux/acpi.h | 7 ++ 6 files changed, 230 insertions(+), 91 deletions(-) -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
