Commit b58f0273 authored by James Hogan's avatar James Hogan Committed by Linus Walleij

pinctrl-tz1090-pdc: add TZ1090 PDC pinctrl driver

Add a pin control driver for the TZ1090's low power pins via the
powerdown controller SOC_GPIO_CONTROL registers.

These pins have individually controlled pull-up, and group controlled
schmitt, slew-rate, drive-strength, and power-on-start (pos).

The pdc_gpio0 and pdc_gpio1 pins can also be muxed onto the
ir_mod_stable_out and ir_mod_power_out functions respectively. If no
function is set they remain in GPIO mode. These muxes can be overridden
by requesting them as GPIOs.
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-doc@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: Linus Walleij's avatarLinus Walleij <linus.walleij@linaro.org>
parent d5025f9f
ImgTec TZ1090 PDC pin controller
Required properties:
- compatible: "img,tz1090-pdc-pinctrl"
- reg: Should contain the register physical address and length of the
SOC_GPIO_CONTROL registers in the PDC register region.
Please refer to pinctrl-bindings.txt in this directory for details of the
common pinctrl bindings used by client devices, including the meaning of the
phrase "pin configuration node".
TZ1090-PDC's pin configuration nodes act as a container for an abitrary number
of subnodes. Each of these subnodes represents some desired configuration for a
pin, a group, or a list of pins or groups. This configuration can include the
mux function to select on those pin(s)/group(s), and various pin configuration
parameters, such as pull-up, drive strength, etc.
The name of each subnode is not important; all subnodes should be enumerated
and processed purely based on their content.
Each subnode only affects those parameters that are explicitly listed. In
other words, a subnode that lists a mux function but no pin configuration
parameters implies no information about any pin configuration parameters.
Similarly, a pin subnode that describes a pullup parameter implies no
information about e.g. the mux function. For this reason, even seemingly boolean
values are actually tristates in this binding: unspecified, off, or on.
Unspecified is represented as an absent property, and off/on are represented as
integer values 0 and 1.
Required subnode-properties:
- tz1090,pins : An array of strings. Each string contains the name of a pin or
group. Valid values for these names are listed below.
Optional subnode-properties:
- tz1090,function: A string containing the name of the function to mux to the
pin or group. Valid values for function names are listed below, including
which pingroups can be muxed to them.
- supported generic pinconfig properties (for further details see
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt):
- bias-disable
- bias-high-impedance
- bias-bus-hold
- bias-pull-up
- bias-pull-down
- input-schmitt-enable
- input-schmitt-disable
- slew-rate: Integer, control slew rate of pins.
0: slow (half frequency)
1: fast
- drive-strength: Integer, control drive strength of pins in mA.
2: 2mA
4: 4mA
8: 8mA
12: 12mA
- low-power-enable: Flag, power-on-start weak pull-down for invalid power.
- low-power-disable: Flag, power-on-start weak pull-down disabled.
Note that many of these properties are only valid for certain specific pins
or groups. See the TZ1090 TRM for complete details regarding which groups
support which functionality. The Linux pinctrl driver may also be a useful
reference.
Valid values for pin and group names are:
pins:
These all support bias-high-impediance, bias-pull-up, bias-pull-down, and
bias-bus-hold (which can also be provided to any of the groups below to set
it for all gpio pins in that group).
gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data, ext_power.
mux groups:
These all support function.
gpio0
pins: gpio0.
function: ir_mod_stable_out.
gpio1
pins: gpio1.
function: ir_mod_power_out.
drive groups:
These support input-schmitt-enable, input-schmitt-disable, slew-rate,
drive-strength, low-power-enable, and low-power-disable.
pdc
pins: gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data,
ext_power.
Example:
pinctrl_pdc: pinctrl@02006500 {
#gpio-range-cells = <3>;
compatible = "img,tz1090-pdc-pinctrl";
reg = <0x02006500 0x100>;
};
Example board file extracts:
&pinctrl_pdc {
pinctrl-names = "default";
pinctrl-0 = <&syswake_default>;
syswake_default: syswakes {
syswake_cfg {
tz1090,pins = "sys_wake0",
"sys_wake1",
"sys_wake2";
pull-up;
};
};
irmod_default: irmod {
gpio0_cfg {
tz1090,pins = "gpio0";
tz1090,function = "ir_mod_stable_out";
};
gpio1_cfg {
tz1090,pins = "gpio1";
tz1090,function = "ir_mod_power_out";
};
};
};
ir: ir@02006200 {
pinctrl-names = "default";
pinctrl-0 = <&irmod_default>;
};
......@@ -218,6 +218,12 @@ config PINCTRL_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
......
......@@ -41,6 +41,7 @@ obj-$(CONFIG_PINCTRL_TEGRA20) += pinctrl-tegra20.o
obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o
obj-$(CONFIG_PINCTRL_TZ1090) += pinctrl-tz1090.o
obj-$(CONFIG_PINCTRL_TZ1090_PDC) += pinctrl-tz1090-pdc.o
obj-$(CONFIG_PINCTRL_U300) += pinctrl-u300.o
obj-$(CONFIG_PINCTRL_COH901) += pinctrl-coh901.o
obj-$(CONFIG_PINCTRL_SAMSUNG) += pinctrl-samsung.o
......
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