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linux-next/arch/arm
Linus Walleij b2e6355559 i2c: gpio: Convert to use descriptors
This converts the GPIO-based I2C-driver to using GPIO
descriptors instead of the old global numberspace-based
GPIO interface. We:

- Convert the driver to unconditionally grab two GPIOs
  from the device by index 0 (SDA) and 1 (SCL) which
  will work fine with device tree and descriptor tables.
  The existing device trees will continue to work just
  like before, but without any roundtrip through the
  global numberspace.

- Brutally convert all boardfiles still passing global
  GPIOs by registering descriptor tables associated with
  the devices instead so this driver does not need to keep
  supporting passing any GPIO numbers as platform data.

There is no stepwise approach as elegant as this, I
strongly prefer this big hammer over any antsteps for this
conversion. This way the old GPIO numbers go away and
NEVER COME BACK.

Special conversion for the different boards utilizing
I2C-GPIO:

- EP93xx (arch/arm/mach-ep93xx): pretty straight forward as
  all boards were using the same two GPIO lines, just define
  these two in a lookup table for "i2c-gpio" and register
  these along with the device. None of them define any
  other platform data so just pass NULL as platform data.
  This platform selects GPIOLIB so all should be smooth.
  The pins appear on a gpiochip for bank "G" as pins 1 (SDA)
  and 0 (SCL).

- IXP4 (arch/arm/mach-ixp4): descriptor tables have to
  be registered for each board separately. They all use
  "IXP4XX_GPIO_CHIP" so it is pretty straight forward.
  Most board define no other platform data than SCL/SDA
  so they can drop the #include of <linux/i2c-gpio.h> and
  assign NULL to platform data.

  The "goramo_mlr" (Goramo Multilink Router) board is a bit
  worrisome: it implements its own I2C bit-banging in the
  board file, and optionally registers an I2C serial port,
  but claims the same GPIO lines for itself in the board file.
  This is not going to work: there will be competition for the
  GPIO lines, so delete the optional extra I2C bus instead, no
  I2C devices are registered on it anyway, there are just hints
  that it may contain an EEPROM that may be accessed from
  userspace. This needs to be fixed up properly by the serial
  clock using I2C emulation so drop a note in the code.

- KS8695 board acs5k (arch/arm/mach-ks8695/board-acs5.c)
  has some platform data in addition to the pins so it needs to
  be kept around sans GPIO lines. Its GPIO chip is named
  "KS8695" and the arch selects GPIOLIB.

- PXA boards (arch/arm/mach-pxa/*) use some of the platform
  data so it needs to be preserved here. The viper board even
  registers two GPIO I2Cs. The gpiochip is named "gpio-pxa" and
  the arch selects GPIOLIB.

- SA1100 Simpad (arch/arm/mach-sa1100/simpad.c) defines a GPIO
  I2C bus, and the arch selects GPIOLIB.

- Blackfin boards (arch/blackfin/bf533 etc) for these I assume
  their I2C GPIOs refer to the local gpiochip defined in
  arch/blackfin/kernel/bfin_gpio.c names "BFIN-GPIO".
  The arch selects GPIOLIB. The boards get spiked with
  IF_ENABLED(I2C_GPIO) but that is a side effect of it
  being like that already (I would just have Kconfig select
  I2C_GPIO and get rid of them all.) I also delete any
  platform data set to 0 as it will get that value anyway
  from static declartions of platform data.

- The MIPS selects GPIOLIB and the Alchemy machine is using
  two local GPIO chips, one of them has a GPIO I2C. We need
  to adjust the local offset from the global number space here.
  The ATH79 has a proper GPIO driver in drivers/gpio/gpio-ath79.c
  and AFAICT the chip is named "ath79-gpio" and the PB44
  PCF857x expander spawns from this on GPIO 1 and 0. The latter
  board only use the platform data to specify pins so it can be
  cut altogether after this.

- The MFD Silicon Motion SM501 is a special case. It dynamically
  spawns an I2C bus off the MFD using sm501_create_subdev().
  We use an approach to dynamically create a machine descriptor
  table and attach this to the "SM501-LOW" or "SM501-HIGH"
  gpiochip. We use chip-local offsets to grab the right lines.
  We can get rid of two local static inline helpers as part
  of this refactoring.

Cc: Steven Miao <realmz6@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Heiko Schocher <hs@denx.de>
Acked-by: Wu, Aaron <Aaron.Wu@analog.com>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-10-30 08:42:21 +01:00
..
boot ARM: arm64: Devicetree updates for v4.14 2017-09-10 20:54:48 -07:00
common arm: implement ->dma_supported instead of ->set_dma_mask 2017-06-28 06:54:49 -07:00
configs ARM/arm64: SoC platform updates for v4.14 2017-09-10 20:35:46 -07:00
crypto crypto: arm/aes - avoid expanded lookup tables in the final round 2017-08-04 09:27:25 +08:00
firmware
include Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
kernel Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
kvm KVM: arm: implements the kvm_arch_vcpu_in_kernel() 2017-08-08 10:57:43 +02:00
lib ARM: implement memset32 & memset64 2017-09-08 18:26:48 -07:00
mach-actions ARM: owl: smp: Drop bogus holding pen 2017-07-03 14:31:47 +02:00
mach-alpine
mach-artpec
mach-asm9260
mach-aspeed clocksource/drivers/fttmr010: Merge Moxa into FTTMR010 2017-06-12 10:45:10 +02:00
mach-at91 The diff is dominated by the Allwinner A10/A20 SoCs getting converted to 2017-09-13 11:04:14 -07:00
mach-axxia
mach-bcm ARM: SoC platform updates 2017-07-04 14:34:51 -07:00
mach-berlin
mach-clps711x clocksource/drivers: Rename CLKSRC_OF to TIMER_OF 2017-06-14 12:01:03 +02:00
mach-cns3xxx ARM: remove duplicate 'const' annotations' 2017-05-19 10:12:55 +02:00
mach-davinci This pull request contains the following core changes: 2017-09-01 15:34:30 +02:00
mach-digicolor
mach-dove mtd: nand: Rename nand.h into rawnand.h 2017-08-13 10:11:49 +02:00
mach-ebsa110
mach-efm32
mach-ep93xx i2c: gpio: Convert to use descriptors 2017-10-30 08:42:21 +01:00
mach-exynos Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
mach-footbridge
mach-gemini ARM: gemini: select pin controller 2017-08-05 23:48:29 +02:00
mach-highbank
mach-hisi ARM/arm64: SoC platform updates for v4.14 2017-09-10 20:35:46 -07:00
mach-imx dma-mapping updates for 4.14: 2017-09-12 13:30:06 -07:00
mach-integrator
mach-iop13xx ARM/PCI: Convert PCI scan API to pci_scan_root_bus_bridge() 2017-06-28 15:13:55 -05:00
mach-iop32x
mach-iop33x
mach-ixp4xx i2c: gpio: Convert to use descriptors 2017-10-30 08:42:21 +01:00
mach-keystone
mach-ks8695 i2c: gpio: Convert to use descriptors 2017-10-30 08:42:21 +01:00
mach-lpc18xx
mach-lpc32xx ARM/dmaengine: pl08x: pass reasonable memcpy settings 2017-05-24 09:44:32 +05:30
mach-mediatek ARM: mediatek: add MT7623a smp bringup code 2017-07-31 13:31:48 +02:00
mach-meson arm: meson: select the clock controller for Meson8 2017-06-09 11:15:36 -07:00
mach-mmp This pull request contains the following core changes: 2017-09-01 15:34:30 +02:00
mach-moxart clocksource/drivers/fttmr010: Merge Moxa into FTTMR010 2017-06-12 10:45:10 +02:00
mach-mv78xx0 ARM/PCI: Convert PCI scan API to pci_scan_root_bus_bridge() 2017-06-28 15:13:55 -05:00
mach-mvebu Merge branch 'next/cleanup' into next/soc 2017-09-05 20:29:46 -07:00
mach-mxs
mach-netx
mach-nomadik
mach-nspire
mach-omap1 MTD changes for 4.14: 2017-09-09 14:48:21 -07:00
mach-omap2 Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
mach-orion5x mtd: nand: Rename nand.h into rawnand.h 2017-08-13 10:11:49 +02:00
mach-oxnas
mach-picoxcell
mach-prima2 ARM: sirf: mark sirfsoc_init_late as __maybe_unused 2017-07-27 22:57:44 +02:00
mach-pxa i2c: gpio: Convert to use descriptors 2017-10-30 08:42:21 +01:00
mach-qcom
mach-realview
mach-rockchip Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
mach-rpc ARM: rpc: rename RAM_SIZE macro 2017-07-27 22:57:38 +02:00
mach-s3c24xx ARM/arm64: SoC platform updates for v4.14 2017-09-10 20:35:46 -07:00
mach-s3c64xx dmaengine updates for 4.13-rc1 2017-07-08 12:36:50 -07:00
mach-s5pv210
mach-sa1100 i2c: gpio: Convert to use descriptors 2017-10-30 08:42:21 +01:00
mach-shmobile Merge branch 'next/cleanup' into next/soc 2017-09-05 20:29:46 -07:00
mach-socfpga
mach-spear dmaengine updates for 4.13-rc1 2017-07-08 12:36:50 -07:00
mach-sti
mach-stm32 ARM: stm32: Introduce MACH_STM32F469 flag 2017-06-18 20:10:27 -07:00
mach-sunxi clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
mach-tango
mach-tegra ARM: SoC driver updates for v4.14 2017-09-10 20:40:00 -07:00
mach-u300 clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
mach-uniphier
mach-ux500 ARM: ux500: don't select CPUFREQ_DT 2017-08-25 01:34:45 +02:00
mach-versatile
mach-vexpress
mach-vt8500
mach-w90x900 ARM: w90x900: normalize clk API 2017-07-27 22:57:36 +02:00
mach-zx
mach-zynq clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
mm Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
net arm: eBPF JIT compiler 2017-08-22 09:26:43 -07:00
nwfpe
oprofile
plat-iop
plat-omap
plat-orion
plat-pxa
plat-samsung ARM: s3c24xx: Remove non-existing CONFIG_CPU_S3C2413 2017-07-20 07:17:43 +02:00
plat-versatile
probes arm: Prevent hotplug rwsem recursion 2017-05-26 10:10:46 +02:00
tools
vdso
vfp
xen This is the first pull request for the new dma-mapping subsystem 2017-07-06 19:20:54 -07:00
Kconfig Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-09-12 06:10:44 -07:00
Kconfig-nommu
Kconfig.debug Updates to for omap debug_ll code to use generic DEBUG_UART_8250 code. 2017-08-16 22:36:10 +02:00
Makefile ARM: Prepare Actions Semi S500 2017-06-21 18:08:41 +02:00