1 NVIDIA Tegra20 pinmux controller
4 - compatible: "nvidia,tegra20-pinmux"
5 - reg: Should contain the register physical address and length for each of
6 the tri-state, mux, pull-up/down, and pad control register sets.
8 Please refer to pinctrl-bindings.txt in this directory for details of the
9 common pinctrl bindings used by client devices, including the meaning of the
10 phrase "pin configuration node".
12 Tegra's pin configuration nodes act as a container for an arbitrary number of
13 subnodes. Each of these subnodes represents some desired configuration for a
14 pin, a group, or a list of pins or groups. This configuration can include the
15 mux function to select on those pin(s)/group(s), and various pin configuration
16 parameters, such as pull-up, tristate, drive strength, etc.
18 The name of each subnode is not important; all subnodes should be enumerated
19 and processed purely based on their content.
21 Each subnode only affects those parameters that are explicitly listed. In
22 other words, a subnode that lists a mux function but no pin configuration
23 parameters implies no information about any pin configuration parameters.
24 Similarly, a pin subnode that describes a pullup parameter implies no
25 information about e.g. the mux function or tristate parameter. For this
26 reason, even seemingly boolean values are actually tristates in this binding:
27 unspecified, off, or on. Unspecified is represented as an absent property,
28 and off/on are represented as integer values 0 and 1.
30 Required subnode-properties:
31 - nvidia,pins : An array of strings. Each string contains the name of a pin or
32 group. Valid values for these names are listed below.
34 Optional subnode-properties:
35 - nvidia,function: A string containing the name of the function to mux to the
36 pin or group. Valid values for function names are listed below. See the Tegra
37 TRM to determine which are valid for each pin or group.
38 - nvidia,pull: Integer, representing the pull-down/up to apply to the pin.
39 0: none, 1: down, 2: up.
40 - nvidia,tristate: Integer.
41 0: drive, 1: tristate.
42 - nvidia,high-speed-mode: Integer. Enable high speed mode the pins.
44 - nvidia,schmitt: Integer. Enables Schmitt Trigger on the input.
46 - nvidia,low-power-mode: Integer. Valid values 0-3. 0 is least power, 3 is
47 most power. Controls the drive power or current. See "Low Power Mode"
48 or "LPMD1" and "LPMD0" in the Tegra TRM.
49 - nvidia,pull-down-strength: Integer. Controls drive strength. 0 is weakest.
50 The range of valid values depends on the pingroup. See "CAL_DRVDN" in the
52 - nvidia,pull-up-strength: Integer. Controls drive strength. 0 is weakest.
53 The range of valid values depends on the pingroup. See "CAL_DRVUP" in the
55 - nvidia,slew-rate-rising: Integer. Controls rising signal slew rate. 0 is
56 fastest. The range of valid values depends on the pingroup. See
57 "DRVDN_SLWR" in the Tegra TRM.
58 - nvidia,slew-rate-falling: Integer. Controls falling signal slew rate. 0 is
59 fastest. The range of valid values depends on the pingroup. See
60 "DRVUP_SLWF" in the Tegra TRM.
62 Note that many of these properties are only valid for certain specific pins
63 or groups. See the Tegra TRM and various pinmux spreadsheets for complete
64 details regarding which groups support which functionality. The Linux pinctrl
65 driver may also be a useful reference, since it consolidates, disambiguates,
66 and corrects data from all those sources.
68 Valid values for pin and group names are:
72 These all support nvidia,function, nvidia,tristate, and many support
75 ata, atb, atc, atd, ate, cdev1, cdev2, crtp, csus, dap1, dap2, dap3, dap4,
76 ddc, dta, dtb, dtc, dtd, dte, dtf, gma, gmb, gmc, gmd, gme, gpu, gpu7,
77 gpv, hdint, i2cp, irrx, irtx, kbca, kbcb, kbcc, kbcd, kbce, kbcf, lcsn,
78 ld0, ld1, ld2, ld3, ld4, ld5, ld6, ld7, ld8, ld9, ld10, ld11, ld12, ld13,
79 ld14, ld15, ld16, ld17, ldc, ldi, lhp0, lhp1, lhp2, lhs, lm0, lm1, lpp,
80 lpw0, lpw1, lpw2, lsc0, lsc1, lsck, lsda, lsdi, lspi, lvp0, lvp1, lvs,
81 owc, pmc, pta, rm, sdb, sdc, sdd, sdio1, slxa, slxc, slxd, slxk, spdi,
82 spdo, spia, spib, spic, spid, spie, spif, spig, spih, uaa, uab, uac, uad,
87 These only support nvidia,pull.
89 ck32, ddrc, pmca, pmcb, pmcc, pmcd, pmce, xm2c, xm2d, ls, lc, ld17_0,
90 ld19_18, ld21_20, ld23_22.
94 With some exceptions, these support nvidia,high-speed-mode,
95 nvidia,schmitt, nvidia,low-power-mode, nvidia,pull-down-strength,
96 nvidia,pull-up-strength, nvidia,slew-rate-rising, nvidia,slew-rate-falling.
98 drive_ao1, drive_ao2, drive_at1, drive_at2, drive_cdev1, drive_cdev2,
99 drive_csus, drive_dap1, drive_dap2, drive_dap3, drive_dap4, drive_dbg,
100 drive_lcd1, drive_lcd2, drive_sdmmc2, drive_sdmmc3, drive_spi, drive_uaa,
101 drive_uab, drive_uart2, drive_uart3, drive_vi1, drive_vi2, drive_xm2a,
102 drive_xm2c, drive_xm2d, drive_xm2clk, drive_sdio1, drive_crt, drive_ddc,
103 drive_gma, drive_gmb, drive_gmc, drive_gmd, drive_gme, drive_owr,
106 Valid values for nvidia,functions are:
108 ahb_clk, apb_clk, audio_sync, crt, dap1, dap2, dap3, dap4, dap5,
109 displaya, displayb, emc_test0_dll, emc_test1_dll, gmi, gmi_int,
110 hdmi, i2cp, i2c1, i2c2, i2c3, ide, irda, kbc, mio, mipi_hs, nand,
111 osc, owr, pcie, plla_out, pllc_out1, pllm_out1, pllp_out2, pllp_out3,
112 pllp_out4, pwm, pwr_intr, pwr_on, rsvd1, rsvd2, rsvd3, rsvd4, rtck,
113 sdio1, sdio2, sdio3, sdio4, sflash, spdif, spi1, spi2, spi2_alt,
114 spi3, spi4, trace, twc, uarta, uartb, uartc, uartd, uarte, ulpi,
115 vi, vi_sensor_clk, xio
120 compatible = "nvidia,tegra20-pinmux";
121 reg = < 0x70000014 0x10 /* Tri-state registers */
122 0x70000080 0x20 /* Mux registers */
123 0x700000a0 0x14 /* Pull-up/down registers */
124 0x70000868 0xa8 >; /* Pad control registers */
127 Example board file extract:
130 sdio4_default: sdio4_default {
132 nvidia,pins = "atb", "gma", "gme";
133 nvidia,function = "sdio4";
135 nvidia,tristate = <0>;
141 pinctrl-names = "default";
142 pinctrl-0 = <&sdio4_default>;