From: Denis Kalashnikov Subject: [PATCH] ath79: add support for reset key on MikroTik RB912UAG-2HPnD 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. Submitted-by: Denis Kalashnikov Reviewed-by: Sergey Ryazanov Tested-by: Koen Vandeputte --- drivers/gpio/Kconfig | 11 +++++++++++ drivers/gpio/Makefile | 2 ++ drivers/mtd/nand/raw/Kconfig | 6 ++++++ drivers/mtd/nand/raw/Makefile | 1 + 7 files changed, 20 insertions(+) --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -353,6 +353,13 @@ config GPIO_IXP4XX IXP4xx series of chips. If unsure, say N. + +config GPIO_LATCH + tristate "MikroTik RouterBOARD GPIO latch support" + depends on ATH79 + help + GPIO driver for latch on some MikroTik RouterBOARDs. + config GPIO_LOGICVC tristate "Xylon LogiCVC GPIO support" depends on MFD_SYSCON && OF @@ -529,6 +536,10 @@ config GPIO_ROCKCHIP help Say yes here to support GPIO on Rockchip SoCs. +config GPIO_RB91X_KEY + tristate "MikroTik RB91x board series reset key support" + depends on ATH79 + config GPIO_SAMA5D2_PIOBU tristate "SAMA5D2 PIOBU GPIO support" depends on MFD_SYSCON --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -75,6 +75,7 @@ obj-$(CONFIG_GPIO_IT87) += gpio-it87.o obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o +obj-$(CONFIG_GPIO_LATCH) += gpio-latch.o obj-$(CONFIG_GPIO_LOGICVC) += gpio-logicvc.o obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o @@ -123,6 +124,7 @@ obj-$(CONFIG_GPIO_PMIC_EIC_SPRD) += gpio obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o obj-$(CONFIG_GPIO_RASPBERRYPI_EXP) += gpio-raspberrypi-exp.o obj-$(CONFIG_GPIO_RB4XX) += gpio-rb4xx.o +obj-$(CONFIG_GPIO_RB91X_KEY) += gpio-rb91x-key.o obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o obj-$(CONFIG_GPIO_RCAR) += gpio-rcar.o obj-$(CONFIG_GPIO_RDA) += gpio-rda.o --- a/drivers/mtd/nand/raw/Kconfig +++ b/drivers/mtd/nand/raw/Kconfig @@ -570,4 +570,10 @@ config MTD_NAND_RB4XX Enables support for the NAND flash chip on Mikrotik Routerboard RB4xx series. +config MTD_NAND_RB91X + tristate "MikroTik RB91x NAND driver support" + depends on ATH79 && MTD_RAW_NAND + help + Enables support for the NAND flash chip on MikroTik RB91x series. + endif # MTD_RAW_NAND --- a/drivers/mtd/nand/raw/Makefile +++ b/drivers/mtd/nand/raw/Makefile @@ -60,6 +60,7 @@ obj-$(CONFIG_MTD_NAND_ROCKCHIP) += rock obj-$(CONFIG_MTD_NAND_PL35X) += pl35x-nand-controller.o obj-$(CONFIG_MTD_NAND_AR934X) += ar934x_nand.o obj-$(CONFIG_MTD_NAND_RB4XX) += nand_rb4xx.o +obj-$(CONFIG_MTD_NAND_RB91X) += rb91x_nand.o nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o nand-objs += nand_onfi.o