xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/pinctrl/ti,iodelay.txt

* Pin configuration for TI IODELAY controller

TI dra7 based SoCs such as am57xx have a controller for setting the IO delay
for each pin. For most part the IO delay values are programmed by the bootloader,
but some pins need to be configured dynamically by the kernel such as the
MMC pins.

Required Properties:

  - compatible: Must be "ti,dra7-iodelay"
  - reg: Base address and length of the memory resource used
  - #address-cells: Number of address cells
  - #size-cells: Size of cells
  - #pinctrl-cells: Number of pinctrl cells, must be 2. See also
    Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

Example
-------

In the SoC specific dtsi file:

	dra7_iodelay_core: padconf@4844a000 {
		compatible = "ti,dra7-iodelay";
		reg = <0x4844a000 0x0d1c>;
		#address-cells = <1>;
		#size-cells = <0>;
		#pinctrl-cells = <2>;
	};

In board-specific file:

&dra7_iodelay_core {
	mmc2_iodelay_3v3_conf: mmc2_iodelay_3v3_conf {
		pinctrl-pin-array = <
		0x18c A_DELAY_PS(0) G_DELAY_PS(120)	/* CFG_GPMC_A19_IN */
		0x1a4 A_DELAY_PS(265) G_DELAY_PS(360)	/* CFG_GPMC_A20_IN */
		0x1b0 A_DELAY_PS(0) G_DELAY_PS(120)	/* CFG_GPMC_A21_IN */
		0x1bc A_DELAY_PS(0) G_DELAY_PS(120)	/* CFG_GPMC_A22_IN */
		0x1c8 A_DELAY_PS(287) G_DELAY_PS(420)	/* CFG_GPMC_A23_IN */
		0x1d4 A_DELAY_PS(144) G_DELAY_PS(240)	/* CFG_GPMC_A24_IN */
		0x1e0 A_DELAY_PS(0) G_DELAY_PS(0)	/* CFG_GPMC_A25_IN */
		0x1ec A_DELAY_PS(120) G_DELAY_PS(0)	/* CFG_GPMC_A26_IN */
		0x1f8 A_DELAY_PS(120) G_DELAY_PS(180)	/* CFG_GPMC_A27_IN */
		0x360 A_DELAY_PS(0) G_DELAY_PS(0)	/* CFG_GPMC_CS1_IN */
		>;
	};
};