forked from Minki/linux
9e605cb68a
With pinctrl-single,bits it is possible to update just part of the register within the pinctrl-single,function-mask area. This is useful when one register configures mmore than one pin's mux. pinctrl-single,bits takes three parameters: <reg offset, value, sub-mask> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> [Removed a misplaced comment] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
129 lines
3.4 KiB
Plaintext
129 lines
3.4 KiB
Plaintext
One-register-per-pin type device tree based pinctrl driver
|
|
|
|
Required properties:
|
|
- compatible : "pinctrl-single"
|
|
|
|
- reg : offset and length of the register set for the mux registers
|
|
|
|
- pinctrl-single,register-width : pinmux register access width in bits
|
|
|
|
- pinctrl-single,function-mask : mask of allowed pinmux function bits
|
|
in the pinmux register
|
|
|
|
Optional properties:
|
|
- pinctrl-single,function-off : function off mode for disabled state if
|
|
available and same for all registers; if not specified, disabling of
|
|
pin functions is ignored
|
|
- pinctrl-single,bit-per-mux : boolean to indicate that one register controls
|
|
more than one pin
|
|
|
|
This driver assumes that there is only one register for each pin (unless the
|
|
pinctrl-single,bit-per-mux is set), and uses the common pinctrl bindings as
|
|
specified in the pinctrl-bindings.txt document in this directory.
|
|
|
|
The pin configuration nodes for pinctrl-single are specified as pinctrl
|
|
register offset and value pairs using pinctrl-single,pins. Only the bits
|
|
specified in pinctrl-single,function-mask are updated. For example, setting
|
|
a pin for a device could be done with:
|
|
|
|
pinctrl-single,pins = <0xdc 0x118>;
|
|
|
|
Where 0xdc is the offset from the pinctrl register base address for the
|
|
device pinctrl register, and 0x118 contains the desired value of the
|
|
pinctrl register. See the device example and static board pins example
|
|
below for more information.
|
|
|
|
In case when one register changes more than one pin's mux the
|
|
pinctrl-single,bits need to be used which takes three parameters:
|
|
|
|
pinctrl-single,bits = <0xdc 0x18, 0xff>;
|
|
|
|
Where 0xdc is the offset from the pinctrl register base address for the
|
|
device pinctrl register, 0x18 is the desired value, and 0xff is the sub mask to
|
|
be used when applying this change to the register.
|
|
|
|
Example:
|
|
|
|
/* SoC common file */
|
|
|
|
/* first controller instance for pins in core domain */
|
|
pmx_core: pinmux@4a100040 {
|
|
compatible = "pinctrl-single";
|
|
reg = <0x4a100040 0x0196>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
pinctrl-single,register-width = <16>;
|
|
pinctrl-single,function-mask = <0xffff>;
|
|
};
|
|
|
|
/* second controller instance for pins in wkup domain */
|
|
pmx_wkup: pinmux@4a31e040 {
|
|
compatible = "pinctrl-single;
|
|
reg = <0x4a31e040 0x0038>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
pinctrl-single,register-width = <16>;
|
|
pinctrl-single,function-mask = <0xffff>;
|
|
};
|
|
|
|
control_devconf0: pinmux@48002274 {
|
|
compatible = "pinctrl-single";
|
|
reg = <0x48002274 4>; /* Single register */
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
pinctrl-single,bit-per-mux;
|
|
pinctrl-single,register-width = <32>;
|
|
pinctrl-single,function-mask = <0x5F>;
|
|
};
|
|
|
|
/* board specific .dts file */
|
|
|
|
&pmx_core {
|
|
|
|
/*
|
|
* map all board specific static pins enabled by the pinctrl driver
|
|
* itself during the boot (or just set them up in the bootloader)
|
|
*/
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&board_pins>;
|
|
|
|
board_pins: pinmux_board_pins {
|
|
pinctrl-single,pins = <
|
|
0x6c 0xf
|
|
0x6e 0xf
|
|
0x70 0xf
|
|
0x72 0xf
|
|
>;
|
|
};
|
|
|
|
/* map uart2 pins */
|
|
uart2_pins: pinmux_uart2_pins {
|
|
pinctrl-single,pins = <
|
|
0xd8 0x118
|
|
0xda 0
|
|
0xdc 0x118
|
|
0xde 0
|
|
>;
|
|
};
|
|
};
|
|
|
|
&control_devconf0 {
|
|
mcbsp1_pins: pinmux_mcbsp1_pins {
|
|
pinctrl-single,bits = <
|
|
0x00 0x18 0x18 /* FSR/CLKR signal from FSX/CLKX pin */
|
|
>;
|
|
};
|
|
|
|
mcbsp2_clks_pins: pinmux_mcbsp2_clks_pins {
|
|
pinctrl-single,bits = <
|
|
0x00 0x40 0x40 /* McBSP2 CLKS from McBSP_CLKS pin */
|
|
>;
|
|
};
|
|
|
|
};
|
|
|
|
&uart2 {
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&uart2_pins>;
|
|
};
|