Commit 4d3d0e42 authored by Andrew Jeffery's avatar Andrew Jeffery Committed by Linus Walleij

pinctrl: Add core support for Aspeed SoCs

The Aspeed SoCs typically provide more than 200 pins for GPIO and other
functions. The signal enabled on a pin is determined on a priority
basis, where a given pin can provide a number of different signal types.

In addition to the priority levels, the Aspeed pin controllers describe
the signal active on a pin by compound logical expressions involving
multiple operators, registers and bits. Some difficulty arises as a
pin's function bit masks for each priority level are frequently not the
same (i.e. we cannot just flip a bit to change from a high to low
priority signal), or even in the same register(s). Some configuration
bits affect multiple pins, while in other cases the signals for a bus
must each be enabled individually.

Together, these features give rise to some complexity in the
implementation. A more complete description of the complexities is
provided in the associated header file.

The patch doesn't implement pinctrl/pinmux/pinconf for any particular
Aspeed SoC, rather it adds the framework for defining pinmux
configurations.
Signed-off-by: default avatarAndrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley's avatarJoel Stanley <joel@jms.id.au>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 5f714700
......@@ -254,6 +254,7 @@ config PINCTRL_ZYNQ
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"
......
......@@ -37,6 +37,7 @@ obj-$(CONFIG_PINCTRL_TB10X) += pinctrl-tb10x.o
obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
obj-$(CONFIG_ARCH_ASPEED) += aspeed/
obj-y += bcm/
obj-$(CONFIG_PINCTRL_BERLIN) += berlin/
obj-y += freescale/
......
config PINCTRL_ASPEED
bool
depends on (ARCH_ASPEED || COMPILE_TEST) && OF
depends on MFD_SYSCON
select PINMUX
select PINCONF
select GENERIC_PINCONF
select REGMAP_MMIO
# Aspeed pinctrl support
ccflags-y += -Woverride-init
obj-$(CONFIG_PINCTRL_ASPEED) += pinctrl-aspeed.o
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