xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/pinctrl/fsl,imx7ulp-pinctrl.txt (revision 8c2ecf20)

* Freescale i.MX7ULP IOMUX Controller

i.MX 7ULP has three IOMUXC instances: IOMUXC0 for M4 ports, IOMUXC1 for A7
ports and IOMUXC DDR for DDR interface.

Note:
This binding doc is only for the IOMUXC1 support in A7 Domain and it only
supports generic pin config.

Please refer to fsl,imx-pinctrl.txt in this directory for common binding
part and usage.

Required properties:
- compatible:	"fsl,imx7ulp-iomuxc1".
- fsl,pins:	Each entry consists of 5 integers which represents the mux
		and config setting for one pin. The first 4 integers
		<mux_conf_reg input_reg mux_mode input_val> are specified
		using a PIN_FUNC_ID macro, which can be found in
		imx7ulp-pinfunc.h in the device tree source folder.
		The last integer CONFIG is the pad setting value like
		pull-up on this pin.

		Please refer to i.MX7ULP Reference Manual for detailed
		CONFIG settings.

CONFIG bits definition:
PAD_CTL_OBE		(1 << 17)
PAD_CTL_IBE		(1 << 16)
PAD_CTL_LK		(1 << 16)
PAD_CTL_DSE_HI		(1 << 6)
PAD_CTL_DSE_STD		(0 << 6)
PAD_CTL_ODE		(1 << 5)
PAD_CTL_PUSH_PULL	(0 << 5)
PAD_CTL_SRE_SLOW	(1 << 2)
PAD_CTL_SRE_STD		(0 << 2)
PAD_CTL_PE		(1 << 0)

Examples:
#include "imx7ulp-pinfunc.h"

/* Pin Controller Node */
iomuxc1: pinctrl@40ac0000 {
	compatible = "fsl,imx7ulp-iomuxc1";
	reg = <0x40ac0000 0x1000>;

	/* Pin Configuration Node */
	pinctrl_lpuart4: lpuart4grp {
		fsl,pins = <
			IMX7ULP_PAD_PTC3__LPUART4_RX	0x1
			IMX7ULP_PAD_PTC2__LPUART4_TX	0x1
		>;
	};
};