target/linux/ath79/patches-5.15/939-mikrotik-rb91x.patch

   1 From: Denis Kalashnikov <denis281089@gmail.com>
   2 Subject: [PATCH] ath79: add support for reset key on MikroTik RB912UAG-2HPnD
   3
   4 On MikroTik RB91x board series a reset key shares SoC gpio
   5 line #15 with NAND ALE and NAND IO7. So we need a custom
   6 gpio driver to manage this non-trivial connection schema.
   7 Also rb91x-nand needs to have an ability to disable a polling
   8 of the key while it works with NAND.
   9
  10 While we've been integrating rb91x-key into a firmware, we've
  11 figured out that:
  12 * In the gpio-latch driver we need to add a "cansleep" suffix to
  13 several gpiolib calls,
  14 * When gpio-latch and rb91x-nand fail to get a gpio and an error
  15 is -EPROBE_DEFER, they shouldn't report about this, since this
  16 actually is not an error and occurs when the gpio-latch probe
  17 function is called before the rb91x-key probe.
  18 We fix these related things here too.
  19
  20 Submitted-by: Denis Kalashnikov <denis281089@gmail.com>
  21 Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
  22 Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
  23 ---
  24  drivers/gpio/Kconfig                          | 11 +++++++++++
  25  drivers/gpio/Makefile                         |  2 ++
  26  drivers/mtd/nand/raw/Kconfig                  |  6 ++++++
  27  drivers/mtd/nand/raw/Makefile                 |  1 +
  28  7 files changed, 20 insertions(+)
  29
  30 --- a/drivers/gpio/Kconfig
  31 +++ b/drivers/gpio/Kconfig
  32 @@ -353,6 +353,13 @@ config GPIO_IXP4XX
  33           IXP4xx series of chips.
  34
  35           If unsure, say N.
  36 +
  37 +config GPIO_LATCH
  38 +       tristate "MikroTik RouterBOARD GPIO latch support"
  39 +       depends on ATH79
  40 +       help
  41 +         GPIO driver for latch on some MikroTik RouterBOARDs.
  42 +
  43  config GPIO_LOGICVC
  44         tristate "Xylon LogiCVC GPIO support"
  45         depends on MFD_SYSCON && OF
  46 @@ -529,6 +536,10 @@ config GPIO_ROCKCHIP
  47         help
  48           Say yes here to support GPIO on Rockchip SoCs.
  49
  50 +config GPIO_RB91X_KEY
  51 +       tristate "MikroTik RB91x board series reset key support"
  52 +       depends on ATH79
  53 +
  54  config GPIO_SAMA5D2_PIOBU
  55         tristate "SAMA5D2 PIOBU GPIO support"
  56         depends on MFD_SYSCON
  57 --- a/drivers/gpio/Makefile
  58 +++ b/drivers/gpio/Makefile
  59 @@ -75,6 +75,7 @@ obj-$(CONFIG_GPIO_IT87)                       += gpio-it87.o
  60  obj-$(CONFIG_GPIO_IXP4XX)              += gpio-ixp4xx.o
  61  obj-$(CONFIG_GPIO_JANZ_TTL)            += gpio-janz-ttl.o
  62  obj-$(CONFIG_GPIO_KEMPLD)              += gpio-kempld.o
  63 +obj-$(CONFIG_GPIO_LATCH)               += gpio-latch.o
  64  obj-$(CONFIG_GPIO_LOGICVC)             += gpio-logicvc.o
  65  obj-$(CONFIG_GPIO_LOONGSON1)           += gpio-loongson1.o
  66  obj-$(CONFIG_GPIO_LOONGSON)            += gpio-loongson.o
  67 @@ -123,6 +124,7 @@ obj-$(CONFIG_GPIO_PMIC_EIC_SPRD)    += gpio
  68  obj-$(CONFIG_GPIO_PXA)                 += gpio-pxa.o
  69  obj-$(CONFIG_GPIO_RASPBERRYPI_EXP)     += gpio-raspberrypi-exp.o
  70  obj-$(CONFIG_GPIO_RB4XX)               += gpio-rb4xx.o
  71 +obj-$(CONFIG_GPIO_RB91X_KEY)           += gpio-rb91x-key.o
  72  obj-$(CONFIG_GPIO_RC5T583)             += gpio-rc5t583.o
  73  obj-$(CONFIG_GPIO_RCAR)                        += gpio-rcar.o
  74  obj-$(CONFIG_GPIO_RDA)                 += gpio-rda.o
  75 --- a/drivers/mtd/nand/raw/Kconfig
  76 +++ b/drivers/mtd/nand/raw/Kconfig
  77 @@ -570,4 +570,10 @@ config MTD_NAND_RB4XX
  78           Enables support for the NAND flash chip on Mikrotik Routerboard
  79           RB4xx series.
  80
  81 +config MTD_NAND_RB91X
  82 +       tristate "MikroTik RB91x NAND driver support"
  83 +       depends on ATH79 && MTD_RAW_NAND
  84 +       help
  85 +         Enables support for the NAND flash chip on MikroTik RB91x series.
  86 +
  87  endif # MTD_RAW_NAND
  88 --- a/drivers/mtd/nand/raw/Makefile
  89 +++ b/drivers/mtd/nand/raw/Makefile
  90 @@ -60,6 +60,7 @@ obj-$(CONFIG_MTD_NAND_ROCKCHIP)               += rock
  91  obj-$(CONFIG_MTD_NAND_PL35X)           += pl35x-nand-controller.o
  92  obj-$(CONFIG_MTD_NAND_AR934X)          += ar934x_nand.o
  93  obj-$(CONFIG_MTD_NAND_RB4XX)           += nand_rb4xx.o
  94 +obj-$(CONFIG_MTD_NAND_RB91X)           += rb91x_nand.o
  95
  96  nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
  97  nand-objs += nand_onfi.o