ti,iodelay.txt

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    1 * Pin configuration for TI IODELAY controller
    2 
    3 TI dra7 based SoCs such as am57xx have a controller for setting the IO delay
    4 for each pin. For most part the IO delay values are programmed by the bootloader,
    5 but some pins need to be configured dynamically by the kernel such as the
    6 MMC pins.
    7 
    8 Required Properties:
    9 
   10   - compatible: Must be "ti,dra7-iodelay"
   11   - reg: Base address and length of the memory resource used
   12   - #address-cells: Number of address cells
   13   - #size-cells: Size of cells
   14   - #pinctrl-cells: Number of pinctrl cells, must be 2. See also
   15     Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
   16 
   17 Example
   18 -------
   19 
   20 In the SoC specific dtsi file:
   21 
   22         dra7_iodelay_core: padconf@4844a000 {
   23                 compatible = "ti,dra7-iodelay";
   24                 reg = <0x4844a000 0x0d1c>;
   25                 #address-cells = <1>;
   26                 #size-cells = <0>;
   27                 #pinctrl-cells = <2>;
   28         };
   29 
   30 In board-specific file:
   31 
   32 &dra7_iodelay_core {
   33         mmc2_iodelay_3v3_conf: mmc2_iodelay_3v3_conf {
   34                 pinctrl-pin-array = <
   35                 0x18c A_DELAY_PS(0) G_DELAY_PS(120)     /* CFG_GPMC_A19_IN */
   36                 0x1a4 A_DELAY_PS(265) G_DELAY_PS(360)   /* CFG_GPMC_A20_IN */
   37                 0x1b0 A_DELAY_PS(0) G_DELAY_PS(120)     /* CFG_GPMC_A21_IN */
   38                 0x1bc A_DELAY_PS(0) G_DELAY_PS(120)     /* CFG_GPMC_A22_IN */
   39                 0x1c8 A_DELAY_PS(287) G_DELAY_PS(420)   /* CFG_GPMC_A23_IN */
   40                 0x1d4 A_DELAY_PS(144) G_DELAY_PS(240)   /* CFG_GPMC_A24_IN */
   41                 0x1e0 A_DELAY_PS(0) G_DELAY_PS(0)       /* CFG_GPMC_A25_IN */
   42                 0x1ec A_DELAY_PS(120) G_DELAY_PS(0)     /* CFG_GPMC_A26_IN */
   43                 0x1f8 A_DELAY_PS(120) G_DELAY_PS(180)   /* CFG_GPMC_A27_IN */
   44                 0x360 A_DELAY_PS(0) G_DELAY_PS(0)       /* CFG_GPMC_CS1_IN */
   45                 >;
   46         };
   47 };

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sys/contrib/device-tree/Bindings/pinctrl/ti,iodelay.txt