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127 lines
4 KiB
Text
127 lines
4 KiB
Text
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 arbitrary 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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