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ath79: add support for reset key on MikroTik RB912UAG-2HPnD

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On MikroTik RB91x board series a reset key shares SoC gpio
line #15 with NAND ALE and NAND IO7. So we need a custom
gpio driver to manage this non-trivial connection schema.
Also rb91x-nand needs to have an ability to disable a polling
of the key while it works with NAND.

While we've been integrating rb91x-key into a firmware, we've
figured out that:
* In the gpio-latch driver we need to add a "cansleep" suffix to
several gpiolib calls,
* When gpio-latch and rb91x-nand fail to get a gpio and an error
is -EPROBE_DEFER, they shouldn't report about this, since this
actually is not an error and occurs when the gpio-latch probe
function is called before the rb91x-key probe.
We fix these related things here too.

Signed-off-by: Denis Kalashnikov <denis281089@gmail.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
This commit is contained in:
Denis Kalashnikov
2022-01-19 13:25:05 +03:00
committed by Koen Vandeputte
parent 522e414dcb
commit ec85e48a11
7 changed files with 282 additions and 8 deletions
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1
target/linux/ath79/config-5.10
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@@ -74,6 +74,7 @@ CONFIG_GPIO_74X164=y
CONFIG_GPIO_ATH79=y
CONFIG_GPIO_GENERIC=y
# CONFIG_GPIO_LATCH is not set
# CONFIG_GPIO_RB91X_KEY is not set
CONFIG_HANDLE_DOMAIN_IRQ=y
CONFIG_HARDWARE_WATCHPOINTS=y
CONFIG_HAS_DMA=y