forked from Minki/linux
4bd7547756
For some silicons, the pin configuration register can control the output of the pin when the pad including the pin enter low power mode. For example, the pin can be "Drive 1", "Drive 0", "Float" when the pad including the pin enter low power mode. It is very useful when you want to control the power leakeage when the SOC enter low power mode, and can save more power for the low power mode. Signed-off-by: Chao Xie <chao.xie@marvell.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
253 lines
7.9 KiB
Plaintext
253 lines
7.9 KiB
Plaintext
One-register-per-pin type device tree based pinctrl driver
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Required properties:
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- compatible : "pinctrl-single" or "pinconf-single".
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"pinctrl-single" means that pinconf isn't supported.
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"pinconf-single" means that generic pinconf is supported.
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- reg : offset and length of the register set for the mux registers
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- pinctrl-single,register-width : pinmux register access width in bits
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- pinctrl-single,function-mask : mask of allowed pinmux function bits
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in the pinmux register
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Optional properties:
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- pinctrl-single,function-off : function off mode for disabled state if
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available and same for all registers; if not specified, disabling of
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pin functions is ignored
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- pinctrl-single,bit-per-mux : boolean to indicate that one register controls
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more than one pin, for which "pinctrl-single,function-mask" property specifies
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position mask of pin.
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- pinctrl-single,drive-strength : array of value that are used to configure
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drive strength in the pinmux register. They're value of drive strength
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current and drive strength mask.
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/* drive strength current, mask */
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pinctrl-single,power-source = <0x30 0xf0>;
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- pinctrl-single,bias-pullup : array of value that are used to configure the
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input bias pullup in the pinmux register.
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/* input, enabled pullup bits, disabled pullup bits, mask */
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pinctrl-single,bias-pullup = <0 1 0 1>;
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- pinctrl-single,bias-pulldown : array of value that are used to configure the
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input bias pulldown in the pinmux register.
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/* input, enabled pulldown bits, disabled pulldown bits, mask */
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pinctrl-single,bias-pulldown = <2 2 0 2>;
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* Two bits to control input bias pullup and pulldown: User should use
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pinctrl-single,bias-pullup & pinctrl-single,bias-pulldown. One bit means
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pullup, and the other one bit means pulldown.
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* Three bits to control input bias enable, pullup and pulldown. User should
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use pinctrl-single,bias-pullup & pinctrl-single,bias-pulldown. Input bias
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enable bit should be included in pullup or pulldown bits.
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* Although driver could set PIN_CONFIG_BIAS_DISABLE, there's no property as
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pinctrl-single,bias-disable. Because pinctrl single driver could implement
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it by calling pulldown, pullup disabled.
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- pinctrl-single,input-schmitt : array of value that are used to configure
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input schmitt in the pinmux register. In some silicons, there're two input
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schmitt value (rising-edge & falling-edge) in the pinmux register.
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/* input schmitt value, mask */
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pinctrl-single,input-schmitt = <0x30 0x70>;
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- pinctrl-single,input-schmitt-enable : array of value that are used to
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configure input schmitt enable or disable in the pinmux register.
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/* input, enable bits, disable bits, mask */
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pinctrl-single,input-schmitt-enable = <0x30 0x40 0 0x70>;
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- pinctrl-single,low-power-mode : array of value that are used to configure
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low power mode of this pin. For some silicons, the low power mode will
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control the output of the pin when the pad including the pin enter low
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power mode.
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/* low power mode value, mask */
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pinctrl-single,low-power-mode = <0x288 0x388>;
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- pinctrl-single,gpio-range : list of value that are used to configure a GPIO
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range. They're value of subnode phandle, pin base in pinctrl device, pin
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number in this range, GPIO function value of this GPIO range.
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The number of parameters is depend on #pinctrl-single,gpio-range-cells
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property.
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/* pin base, nr pins & gpio function */
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pinctrl-single,gpio-range = <&range 0 3 0 &range 3 9 1>;
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- interrupt-controller : standard interrupt controller binding if using
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interrupts for wake-up events for example. In this case pinctrl-single
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is set up as a chained interrupt controller and the wake-up interrupts
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can be requested by the drivers using request_irq().
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- #interrupt-cells : standard interrupt binding if using interrupts
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This driver assumes that there is only one register for each pin (unless the
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pinctrl-single,bit-per-mux is set), and uses the common pinctrl bindings as
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specified in the pinctrl-bindings.txt document in this directory.
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The pin configuration nodes for pinctrl-single are specified as pinctrl
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register offset and value pairs using pinctrl-single,pins. Only the bits
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specified in pinctrl-single,function-mask are updated. For example, setting
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a pin for a device could be done with:
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pinctrl-single,pins = <0xdc 0x118>;
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Where 0xdc is the offset from the pinctrl register base address for the
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device pinctrl register, and 0x118 contains the desired value of the
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pinctrl register. See the device example and static board pins example
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below for more information.
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In case when one register changes more than one pin's mux the
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pinctrl-single,bits need to be used which takes three parameters:
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pinctrl-single,bits = <0xdc 0x18 0xff>;
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Where 0xdc is the offset from the pinctrl register base address for the
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device pinctrl register, 0x18 is the desired value, and 0xff is the sub mask to
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be used when applying this change to the register.
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Optional sub-node: In case some pins could be configured as GPIO in the pinmux
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register, those pins could be defined as a GPIO range. This sub-node is required
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by pinctrl-single,gpio-range property.
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Required properties in sub-node:
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- #pinctrl-single,gpio-range-cells : the number of parameters after phandle in
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pinctrl-single,gpio-range property.
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range: gpio-range {
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#pinctrl-single,gpio-range-cells = <3>;
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};
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Example:
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/* SoC common file */
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/* first controller instance for pins in core domain */
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pmx_core: pinmux@4a100040 {
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compatible = "pinctrl-single";
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reg = <0x4a100040 0x0196>;
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#address-cells = <1>;
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#size-cells = <0>;
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#interrupt-cells = <1>;
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interrupt-controller;
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pinctrl-single,register-width = <16>;
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pinctrl-single,function-mask = <0xffff>;
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};
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/* second controller instance for pins in wkup domain */
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pmx_wkup: pinmux@4a31e040 {
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compatible = "pinctrl-single";
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reg = <0x4a31e040 0x0038>;
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#address-cells = <1>;
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#size-cells = <0>;
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#interrupt-cells = <1>;
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interrupt-controller;
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pinctrl-single,register-width = <16>;
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pinctrl-single,function-mask = <0xffff>;
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};
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control_devconf0: pinmux@48002274 {
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compatible = "pinctrl-single";
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reg = <0x48002274 4>; /* Single register */
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#address-cells = <1>;
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#size-cells = <0>;
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pinctrl-single,bit-per-mux;
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pinctrl-single,register-width = <32>;
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pinctrl-single,function-mask = <0x5F>;
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};
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/* third controller instance for pins in gpio domain */
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pmx_gpio: pinmux@d401e000 {
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compatible = "pinconf-single";
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reg = <0xd401e000 0x0330>;
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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pinctrl-single,register-width = <32>;
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pinctrl-single,function-mask = <7>;
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/* sparse GPIO range could be supported */
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pinctrl-single,gpio-range = <&range 0 3 0 &range 3 9 1
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&range 12 1 0 &range 13 29 1
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&range 43 1 0 &range 44 49 1
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&range 94 1 1 &range 96 2 1>;
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range: gpio-range {
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#pinctrl-single,gpio-range-cells = <3>;
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};
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};
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/* board specific .dts file */
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&pmx_core {
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/*
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* map all board specific static pins enabled by the pinctrl driver
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* itself during the boot (or just set them up in the bootloader)
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*/
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pinctrl-names = "default";
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pinctrl-0 = <&board_pins>;
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board_pins: pinmux_board_pins {
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pinctrl-single,pins = <
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0x6c 0xf
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0x6e 0xf
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0x70 0xf
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0x72 0xf
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>;
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};
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uart0_pins: pinmux_uart0_pins {
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pinctrl-single,pins = <
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0x208 0 /* UART0_RXD (IOCFG138) */
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0x20c 0 /* UART0_TXD (IOCFG139) */
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>;
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pinctrl-single,bias-pulldown = <0 2 2>;
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pinctrl-single,bias-pullup = <0 1 1>;
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};
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/* map uart2 pins */
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uart2_pins: pinmux_uart2_pins {
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pinctrl-single,pins = <
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0xd8 0x118
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0xda 0
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0xdc 0x118
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0xde 0
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>;
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};
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};
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&control_devconf0 {
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mcbsp1_pins: pinmux_mcbsp1_pins {
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pinctrl-single,bits = <
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0x00 0x18 0x18 /* FSR/CLKR signal from FSX/CLKX pin */
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>;
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};
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mcbsp2_clks_pins: pinmux_mcbsp2_clks_pins {
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pinctrl-single,bits = <
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0x00 0x40 0x40 /* McBSP2 CLKS from McBSP_CLKS pin */
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>;
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};
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};
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&uart1 {
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pinctrl-names = "default";
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pinctrl-0 = <&uart0_pins>;
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};
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&uart2 {
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pinctrl-names = "default";
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pinctrl-0 = <&uart2_pins>;
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};
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