forked from Minki/linux
a7b3bf55e7
As the binding for slew-rate is under discussion and seems to need more tought it will get removed for now, so it doesn't get an offical release. Therefore remove it again from the only current user, tz1090. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
128 lines
4.0 KiB
Plaintext
128 lines
4.0 KiB
Plaintext
ImgTec TZ1090 PDC pin controller
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Required properties:
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- compatible: "img,tz1090-pdc-pinctrl"
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- reg: Should contain the register physical address and length of the
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SOC_GPIO_CONTROL registers in the PDC register region.
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Please refer to pinctrl-bindings.txt in this directory for details of the
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common pinctrl bindings used by client devices, including the meaning of the
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phrase "pin configuration node".
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TZ1090-PDC's pin configuration nodes act as a container for an abitrary number
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of subnodes. Each of these subnodes represents some desired configuration for a
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pin, a group, or a list of pins or groups. This configuration can include the
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mux function to select on those pin(s)/group(s), and various pin configuration
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parameters, such as pull-up, drive strength, etc.
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The name of each subnode is not important; all subnodes should be enumerated
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and processed purely based on their content.
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Each subnode only affects those parameters that are explicitly listed. In
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other words, a subnode that lists a mux function but no pin configuration
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parameters implies no information about any pin configuration parameters.
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Similarly, a pin subnode that describes a pullup parameter implies no
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information about e.g. the mux function. For this reason, even seemingly boolean
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values are actually tristates in this binding: unspecified, off, or on.
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Unspecified is represented as an absent property, and off/on are represented as
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integer values 0 and 1.
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Required subnode-properties:
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- tz1090,pins : An array of strings. Each string contains the name of a pin or
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group. Valid values for these names are listed below.
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Optional subnode-properties:
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- tz1090,function: A string containing the name of the function to mux to the
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pin or group. Valid values for function names are listed below, including
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which pingroups can be muxed to them.
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- supported generic pinconfig properties (for further details see
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Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt):
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- bias-disable
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- bias-high-impedance
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- bias-bus-hold
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- bias-pull-up
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- bias-pull-down
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- input-schmitt-enable
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- input-schmitt-disable
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- drive-strength: Integer, control drive strength of pins in mA.
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2: 2mA
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4: 4mA
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8: 8mA
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12: 12mA
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- low-power-enable: Flag, power-on-start weak pull-down for invalid power.
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- low-power-disable: Flag, power-on-start weak pull-down disabled.
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Note that many of these properties are only valid for certain specific pins
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or groups. See the TZ1090 TRM for complete details regarding which groups
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support which functionality. The Linux pinctrl driver may also be a useful
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reference.
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Valid values for pin and group names are:
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pins:
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These all support bias-high-impediance, bias-pull-up, bias-pull-down, and
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bias-bus-hold (which can also be provided to any of the groups below to set
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it for all gpio pins in that group).
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gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data, ext_power.
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mux groups:
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These all support function.
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gpio0
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pins: gpio0.
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function: ir_mod_stable_out.
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gpio1
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pins: gpio1.
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function: ir_mod_power_out.
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drive groups:
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These support input-schmitt-enable, input-schmitt-disable,
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drive-strength, low-power-enable, and low-power-disable.
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pdc
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pins: gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data,
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ext_power.
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Example:
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pinctrl_pdc: pinctrl@02006500 {
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#gpio-range-cells = <3>;
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compatible = "img,tz1090-pdc-pinctrl";
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reg = <0x02006500 0x100>;
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};
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Example board file extracts:
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&pinctrl_pdc {
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pinctrl-names = "default";
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pinctrl-0 = <&syswake_default>;
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syswake_default: syswakes {
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syswake_cfg {
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tz1090,pins = "sys_wake0",
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"sys_wake1",
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"sys_wake2";
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pull-up;
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};
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};
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irmod_default: irmod {
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gpio0_cfg {
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tz1090,pins = "gpio0";
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tz1090,function = "ir_mod_stable_out";
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};
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gpio1_cfg {
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tz1090,pins = "gpio1";
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tz1090,function = "ir_mod_power_out";
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};
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};
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};
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ir: ir@02006200 {
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pinctrl-names = "default";
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pinctrl-0 = <&irmod_default>;
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};
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