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From: Denis Kalashnikov <denis281089@gmail.com>
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 <denis281089@gmail.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
---
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
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