On 17/11/16 01:18, Dmitry Torokhov wrote:
On Wed, Nov 16, 2016 at 06:38:22PM +0000, Sudeep Holla wrote:Commit 700a38b27eef ("Input: gpio_keys - switch to using generic device properties") switched to use generic device properties for GPIO keys and commit 5feeca3c1e39 ("Input: gpio_keys - add support for GPIO descriptors") switched from legacy GPIO numbers to GPIO descriptors. Previously devm_gpio_request_one was explicitly passed GPIOF_DIR_IN flag to set the GPIO direction as input. However devm_get_gpiod_from_child doesn't have such provisions and hence fwnode_get_named_gpiod can't set it as input. This breaks few platforms with the following error: " gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ unable to lock HW IRQ <n> for IRQ genirq: Failed to request resources for POWER (irq <x>) on irqchip gpio_keys: Unable to claim irq <x>; error -22 gpio-keys: probe failed with error -22 " This patch fixes the issue by setting input direction explicitly for gpio input keys. It also remove the existing GPIOF_DIR_IN flag setting for the legacy gpios and merges into single gpiod_direction_input call. Fixes: 700a38b27eef ("Input: gpio_keys - switch to using generic device properties") Cc: Dmitry Torokhov <dmitry.torok...@gmail.com> Cc: Linus Walleij <linus.wall...@linaro.org> Cc: Geert Uytterhoeven <geert+rene...@glider.be> Cc: Mika Westerberg <mika.westerb...@linux.intel.com> Signed-off-by: Sudeep Holla <sudeep.ho...@arm.com> --- drivers/input/keyboard/gpio_keys.c | 10 +++++++++- drivers/input/keyboard/gpio_keys_polled.c | 10 +++++++++- 2 files changed, 18 insertions(+), 2 deletions(-) v2->v3: - Added error handling and error message diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c index 5576f2ae0b71..ed38a05b3039 100644 --- a/drivers/input/keyboard/gpio_keys.c +++ b/drivers/input/keyboard/gpio_keys.c @@ -502,7 +502,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev, * Legacy GPIO number, so request the GPIO here and * convert it to descriptor. */ - unsigned flags = GPIOF_IN; + unsigned flags = 0; if (button->active_low) flags |= GPIOF_ACTIVE_LOW;Sudeep, I looked into this aa bit deeper, and I have issue with this part: in absence of GPIOF_IN devm_gpio_request_one() will attempt to configure GPIO line as output, which may not work. Because of this I think we should move gpiod_direction_input() call into the "modern" branch and leave legacy branch as is. Does the version below work for you?
Yes it does and in fact I started with something similar and then saw that I can make it common between legacy and new branch conditions. So I am fine with the modified version you sent. -- Regards, Sudeep
