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linux/drivers/pinctrl/Kconfig
Nishanth Menon 003910ebc8 pinctrl: Introduce TI IOdelay configuration driver 
SoC family such as DRA7 family of processors have, in addition
to the regular muxing of pins (as done by pinctrl-single), a separate
hardware module called IODelay which is also expected to be configured.
The "IODelay" module has it's own register space that is independent
of the control module and the padconf register area.

With recent changes to the pinctrl framework, we can now support
this hardware with a reasonably minimal driver by using #pinctrl-cells,
GENERIC_PINCTRL_GROUPS and GENERIC_PINMUX_FUNCTIONS.

It is advocated strongly in TI's official documentation considering
the existing design of the DRA7 family of processors during mux or
IODelay reconfiguration, there is a potential for a significant glitch
which may cause functional impairment to certain hardware. It is
hence recommended to do as little of muxing as absolutely necessary
without I/O isolation (which can only be done in initial stages of
bootloader).

NOTE: with the system wide I/O isolation scheme present in DRA7 SoC
family, it is not reasonable to do stop all I/O operations for every
such pad configuration scheme. So, we will let it glitch when used in
this mode.

Even with the above limitation, certain functionality such as MMC has
mandatory need for IODelay reconfiguration requirements, depending on
speed of transfer. In these cases, with careful examination of usecase
involved, the expected glitch can be controlled such that it does not
impact functionality.

In short, IODelay module support as a padconf driver being introduced
here is not expected to do SoC wide I/O Isolation and is meant for
a limited subset of IODelay configuration requirements that need to
be dynamic and whose glitchy behavior will not cause functionality
failure for that interface.

IMPORTANT NOTE: we take the approach of keeping LOCK_BITs cleared
to 0x0 at all times, even when configuring Manual IO Timing Modes.
This is done by eliminating the LOCK_BIT=1 setting from Step
of the Manual IO timing Mode configuration procedure. This option
leaves the CFG_* registers unprotected from unintended writes to the
CTRL_CORE_PAD_* registers while Manual IO Timing Modes are configured.

This approach is taken to allow for a generic driver to exist in kernel
world that has to be used carefully in required usecases.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[tony@atomide.com: updated to use generic pinctrl functions, added
 binding documentation, updated comments]
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-01-09 19:43:21 +01:00

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#
# PINCTRL infrastructure and drivers
#
config PINCTRL
bool
menu "Pin controllers"
depends on PINCTRL
config GENERIC_PINCTRL_GROUPS
bool
config PINMUX
bool "Support pin multiplexing controllers" if COMPILE_TEST
config GENERIC_PINMUX_FUNCTIONS
bool
select PINMUX
config PINCONF
bool "Support pin configuration controllers" if COMPILE_TEST
config GENERIC_PINCONF
bool
select PINCONF
config DEBUG_PINCTRL
bool "Debug PINCTRL calls"
depends on DEBUG_KERNEL
help
Say Y here to add some extra checks and diagnostics to PINCTRL calls.
config PINCTRL_ADI2
bool "ADI pin controller driver"
depends on BLACKFIN
select PINMUX
select IRQ_DOMAIN
help
This is the pin controller and gpio driver for ADI BF54x, BF60x and
future processors. This option is selected automatically when specific
machine and arch are selected to build.
config PINCTRL_AS3722
tristate "Pinctrl and GPIO driver for ams AS3722 PMIC"
depends on MFD_AS3722 && GPIOLIB
select PINMUX
select GENERIC_PINCONF
help
AS3722 device supports the configuration of GPIO pins for different
functionality. This driver supports the pinmux, push-pull and
open drain configuration for the GPIO pins of AS3722 devices. It also
supports the GPIO functionality through gpiolib.
config PINCTRL_BF54x
def_bool y if BF54x
select PINCTRL_ADI2
config PINCTRL_BF60x
def_bool y if BF60x
select PINCTRL_ADI2
config PINCTRL_AT91
bool "AT91 pinctrl driver"
depends on OF
depends on ARCH_AT91
select PINMUX
select PINCONF
select GPIOLIB
select OF_GPIO
select GPIOLIB_IRQCHIP
help
Say Y here to enable the at91 pinctrl driver
config PINCTRL_AT91PIO4
bool "AT91 PIO4 pinctrl driver"
depends on OF
depends on ARCH_AT91
select PINMUX
select GENERIC_PINCONF
select GPIOLIB
select GPIOLIB_IRQCHIP
select OF_GPIO
help
Say Y here to enable the at91 pinctrl/gpio driver for Atmel PIO4
controller available on sama5d2 SoC.
config PINCTRL_AMD
tristate "AMD GPIO pin control"
depends on GPIOLIB
select GPIOLIB_IRQCHIP
select PINCONF
select GENERIC_PINCONF
help
driver for memory mapped GPIO functionality on AMD platforms
(x86 or arm).Most pins are usually muxed to some other
functionality by firmware,so only a small amount is available
for gpio use.
Requires ACPI/FDT device enumeration code to set up a platform
device.
config PINCTRL_DA850_PUPD
tristate "TI DA850/OMAP-L138/AM18XX pullup/pulldown groups"
depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)
select PINCONF
select GENERIC_PINCONF
help
Driver for TI DA850/OMAP-L138/AM18XX pinconf. Used to control
pullup/pulldown pin groups.
config PINCTRL_DIGICOLOR
bool
depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST)
select PINMUX
select GENERIC_PINCONF
config PINCTRL_LANTIQ
bool
depends on LANTIQ
select PINMUX
select PINCONF
config PINCTRL_LPC18XX
bool "NXP LPC18XX/43XX SCU pinctrl driver"
depends on OF && (ARCH_LPC18XX || COMPILE_TEST)
default ARCH_LPC18XX
select PINMUX
select GENERIC_PINCONF
help
Pinctrl driver for NXP LPC18xx/43xx System Control Unit (SCU).
config PINCTRL_FALCON
bool
depends on SOC_FALCON
depends on PINCTRL_LANTIQ
config PINCTRL_MESON
bool
depends on OF
select PINMUX
select PINCONF
select GENERIC_PINCONF
select GPIOLIB
select OF_GPIO
select REGMAP_MMIO
config PINCTRL_OXNAS
bool
depends on OF
select PINMUX
select PINCONF
select GENERIC_PINCONF
select GPIOLIB
select OF_GPIO
select GPIOLIB_IRQCHIP
select MFD_SYSCON
config PINCTRL_ROCKCHIP
bool
select PINMUX
select GENERIC_PINCONF
select GENERIC_IRQ_CHIP
select MFD_SYSCON
config PINCTRL_SINGLE
tristate "One-register-per-pin type device tree based pinctrl driver"
depends on OF
select GENERIC_PINCTRL_GROUPS
select GENERIC_PINMUX_FUNCTIONS
select GENERIC_PINCONF
help
This selects the device tree based generic pinctrl driver.
config PINCTRL_SIRF
bool "CSR SiRFprimaII pin controller driver"
depends on ARCH_SIRF
select PINMUX
select PINCONF
select GENERIC_PINCONF
select GPIOLIB_IRQCHIP
config PINCTRL_SX150X
bool "Semtech SX150x I2C GPIO expander pinctrl driver"
depends on GPIOLIB && I2C=y
select PINMUX
select PINCONF
select GENERIC_PINCONF
select GPIOLIB_IRQCHIP
select REGMAP
help
Say yes here to provide support for Semtech SX150x-series I2C
GPIO expanders as pinctrl module.
Compatible models include:
- 8 bits: sx1508q, sx1502q
- 16 bits: sx1509q, sx1506q
config PINCTRL_PISTACHIO
def_bool y if MACH_PISTACHIO
depends on GPIOLIB
select PINMUX
select GENERIC_PINCONF
select GPIOLIB_IRQCHIP
select OF_GPIO
config PINCTRL_ST
bool
depends on OF
select PINMUX
select PINCONF
select GPIOLIB_IRQCHIP
config PINCTRL_TZ1090
bool "Toumaz Xenif TZ1090 pin control driver"
depends on SOC_TZ1090
select PINMUX
select GENERIC_PINCONF
config PINCTRL_TZ1090_PDC
bool "Toumaz Xenif TZ1090 PDC pin control driver"
depends on SOC_TZ1090
select PINMUX
select PINCONF
config PINCTRL_U300
bool "U300 pin controller driver"
depends on ARCH_U300
select PINMUX
select GENERIC_PINCONF
config PINCTRL_COH901
bool "ST-Ericsson U300 COH 901 335/571 GPIO"
depends on GPIOLIB && ARCH_U300 && PINCTRL_U300
select GPIOLIB_IRQCHIP
help
Say yes here to support GPIO interface on ST-Ericsson U300.
The names of the two IP block variants supported are
COH 901 335 and COH 901 571/3. They contain 3, 5 or 7
ports of 8 GPIO pins each.
config PINCTRL_MAX77620
tristate "MAX77620/MAX20024 Pincontrol support"
depends on MFD_MAX77620 && OF
select PINMUX
select GENERIC_PINCONF
help
Say Yes here to enable Pin control support for Maxim PMIC MAX77620.
This PMIC has 8 GPIO pins that work as GPIO as well as special
function in alternate mode. This driver also configure push-pull,
open drain, FPS slots etc.
config PINCTRL_PALMAS
tristate "Pinctrl driver for the PALMAS Series MFD devices"
depends on OF && MFD_PALMAS
select PINMUX
select GENERIC_PINCONF
help
Palmas device supports the configuration of pins for different
functionality. This driver supports the pinmux, push-pull and
open drain configuration for the Palmas series devices like
TPS65913, TPS80036 etc.
config PINCTRL_PIC32
bool "Microchip PIC32 pin controller driver"
depends on OF
depends on MACH_PIC32
select PINMUX
select GENERIC_PINCONF
select GPIOLIB_IRQCHIP
select OF_GPIO
help
This is the pin controller and gpio driver for Microchip PIC32
microcontrollers. This option is selected automatically when specific
machine and arch are selected to build.
config PINCTRL_PIC32MZDA
def_bool y if PIC32MZDA
select PINCTRL_PIC32
config PINCTRL_ZYNQ
bool "Pinctrl driver for Xilinx Zynq"
depends on ARCH_ZYNQ
select PINMUX
select GENERIC_PINCONF
help
This selects the pinctrl driver for Xilinx Zynq.
source "drivers/pinctrl/aspeed/Kconfig"
source "drivers/pinctrl/bcm/Kconfig"
source "drivers/pinctrl/berlin/Kconfig"
source "drivers/pinctrl/freescale/Kconfig"
source "drivers/pinctrl/intel/Kconfig"
source "drivers/pinctrl/mvebu/Kconfig"
source "drivers/pinctrl/nomadik/Kconfig"
source "drivers/pinctrl/pxa/Kconfig"
source "drivers/pinctrl/qcom/Kconfig"
source "drivers/pinctrl/samsung/Kconfig"
source "drivers/pinctrl/sh-pfc/Kconfig"
source "drivers/pinctrl/spear/Kconfig"
source "drivers/pinctrl/stm32/Kconfig"
source "drivers/pinctrl/sunxi/Kconfig"
source "drivers/pinctrl/tegra/Kconfig"
source "drivers/pinctrl/ti/Kconfig"
source "drivers/pinctrl/uniphier/Kconfig"
source "drivers/pinctrl/vt8500/Kconfig"
source "drivers/pinctrl/mediatek/Kconfig"
config PINCTRL_XWAY
bool
depends on SOC_TYPE_XWAY
depends on PINCTRL_LANTIQ
config PINCTRL_TB10X
bool
depends on OF && ARC_PLAT_TB10X
select GPIOLIB
endmenu
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