NVIDIA Tegra114 pinmux controller

The Tegra114 pinctrl binding is very similar to the Tegra20 and Tegra30
pinctrl binding, as described in nvidia,tegra20-pinmux.txt and
nvidia,tegra30-pinmux.txt. In fact, this document assumes that binding as
a baseline, and only documents the differences between the two bindings.

Required properties:
- compatible: "nvidia,tegra114-pinmux"
- reg: Should contain the register physical address and length for each of
  the pad control and mux registers. The first bank of address must be the
  driver strength pad control register address and second bank address must
  be pinmux register address.

Tegra114 adds the following optional properties for pin configuration subnodes:
- nvidia,enable-input: Integer. Enable the pin's input path. 0: no, 1: yes.
- nvidia,open-drain: Integer. Enable open drain mode. 0: no, 1: yes.
- nvidia,lock: Integer. Lock the pin configuration against further changes
    until reset. 0: no, 1: yes.
- nvidia,io-reset: Integer. Reset the IO path. 0: no, 1: yes.
- nvidia,rcv-sel: Integer. Select VIL/VIH receivers. 0: normal, 1: high.
- nvidia,drive-type: Integer. Valid range 0...3.

As with Tegra20 and Terga30, see the Tegra TRM for complete details regarding
which groups support which functionality.

Valid values for pin and group names are:

  per-pin mux groups:

    These all support nvidia,function, nvidia,tristate, nvidia,pull,
    nvidia,enable-input, nvidia,lock. Some support nvidia,open-drain,
    nvidia,io-reset and nvidia,rcv-sel.

    ulpi_data0_po1, ulpi_data1_po2, ulpi_data2_po3, ulpi_data3_po4,
    ulpi_data4_po5, ulpi_data5_po6, ulpi_data6_po7, ulpi_data7_po0,
    ulpi_clk_py0, ulpi_dir_py1, ulpi_nxt_py2, ulpi_stp_py3, dap3_fs_pp0,
    dap3_din_pp1, dap3_dout_pp2, dap3_sclk_pp3, pv0, pv1, sdmmc1_clk_pz0,
    sdmmc1_cmd_pz1, sdmmc1_dat3_py4, sdmmc1_dat2_py5, sdmmc1_dat1_py6,
    sdmmc1_dat0_py7, clk2_out_pw5, clk2_req_pcc5, hdmi_int_pn7, ddc_scl_pv4,
    ddc_sda_pv5, uart2_rxd_pc3, uart2_txd_pc2, uart2_rts_n_pj6,
    uart2_cts_n_pj5, uart3_txd_pw6, uart3_rxd_pw7, uart3_cts_n_pa1,
    uart3_rts_n_pc0, pu0, pu1, pu2, pu3, pu4, pu5, pu6, gen1_i2c_sda_pc5,
    gen1_i2c_scl_pc4, dap4_fs_pp4, dap4_din_pp5, dap4_dout_pp6, dap4_sclk_pp7,
    clk3_out_pee0, clk3_req_pee1, gmi_wp_n_pc7, gmi_iordy_pi5, gmi_wait_pi7,
    gmi_adv_n_pk0, gmi_clk_pk1, gmi_cs0_n_pj0, gmi_cs1_n_pj2, gmi_cs2_n_pk3,
    gmi_cs3_n_pk4, gmi_cs4_n_pk2, gmi_cs6_n_pi3, gmi_cs7_n_pi6, gmi_ad0_pg0,
    gmi_ad1_pg1, gmi_ad2_pg2, gmi_ad3_pg3, gmi_ad4_pg4, gmi_ad5_pg5,
    gmi_ad6_pg6, gmi_ad7_pg7, gmi_ad8_ph0, gmi_ad9_ph1, gmi_ad10_ph2,
    gmi_ad11_ph3, gmi_ad12_ph4, gmi_ad13_ph5, gmi_ad14_ph6, gmi_ad15_ph7,
    gmi_a16_pj7, gmi_a17_pb0, gmi_a18_pb1, gmi_a19_pk7, gmi_wr_n_pi0,
    gmi_oe_n_pi1, gmi_dqs_p_pj3, gmi_rst_n_pi4, gen2_i2c_scl_pt5,
    gen2_i2c_sda_pt6, sdmmc4_clk_pcc4, sdmmc4_cmd_pt7, sdmmc4_dat0_paa0,
    sdmmc4_dat1_paa1, sdmmc4_dat2_paa2, sdmmc4_dat3_paa3, sdmmc4_dat4_paa4,
    sdmmc4_dat5_paa5, sdmmc4_dat6_paa6, sdmmc4_dat7_paa7, cam_mclk_pcc0,
    pcc1, pbb0, cam_i2c_scl_pbb1, cam_i2c_sda_pbb2, pbb3, pbb4, pbb5, pbb6,
    pbb7, pcc2, pwr_i2c_scl_pz6, pwr_i2c_sda_pz7, kb_row0_pr0, kb_row1_pr1,
    kb_row2_pr2, kb_row3_pr3, kb_row4_pr4, kb_row5_pr5, kb_row6_pr6,
    kb_row7_pr7, kb_row8_ps0, kb_row9_ps1, kb_row10_ps2, kb_col0_pq0,
    kb_col1_pq1, kb_col2_pq2, kb_col3_pq3, kb_col4_pq4, kb_col5_pq5,
    kb_col6_pq6, kb_col7_pq7, clk_32k_out_pa0, sys_clk_req_pz5, core_pwr_req,
    cpu_pwr_req, pwr_int_n, owr, dap1_fs_pn0, dap1_din_pn1, dap1_dout_pn2,
    dap1_sclk_pn3, clk1_req_pee2, clk1_out_pw4, spdif_in_pk6, spdif_out_pk5,
    dap2_fs_pa2, dap2_din_pa4, dap2_dout_pa5, dap2_sclk_pa3, dvfs_pwm_px0,
    gpio_x1_aud_px1, gpio_x3_aud_px3, dvfs_clk_px2, gpio_x4_aud_px4,
    gpio_x5_aud_px5, gpio_x6_aud_px6, gpio_x7_aud_px7, sdmmc3_clk_pa6,
    sdmmc3_cmd_pa7, sdmmc3_dat0_pb7, sdmmc3_dat1_pb6, sdmmc3_dat2_pb5,
    sdmmc3_dat3_pb4, hdmi_cec_pee3, sdmmc1_wp_n_pv3, sdmmc3_cd_n_pv2,
    gpio_w2_aud_pw2, gpio_w3_aud_pw3, usb_vbus_en0_pn4, usb_vbus_en1_pn5,
    sdmmc3_clk_lb_in_pee5, sdmmc3_clk_lb_out_pee4, reset_out_n.

  drive groups:

    These all support nvidia,pull-down-strength, nvidia,pull-up-strength,
    nvidia,slew-rate-rising, nvidia,slew-rate-falling. Most but not all
    support nvidia,high-speed-mode, nvidia,schmitt, nvidia,low-power-mode
    and nvidia,drive-type.

    ao1, ao2, at1, at2, at3, at4, at5, cdev1, cdev2, dap1, dap2, dap3, dap4,
    dbg, sdio3, spi, uaa, uab, uart2, uart3, sdio1, ddc, gma, gme, gmf, gmg,
    gmh, owr, uda.

Valid values for nvidia,functions are:

  blink, cec, cldvfs, clk12, cpu, dap, dap1, dap2, dev3, displaya,
  displaya_alt, displayb, dtv, emc_dll, extperiph1, extperiph2,
  extperiph3, gmi, gmi_alt, hda, hsi, i2c1, i2c2, i2c3, i2c4, i2cpwr,
  i2s0, i2s1, i2s2, i2s3, i2s4, irda, kbc, nand, nand_alt, owr, pmi,
  pwm0, pwm1, pwm2, pwm3, pwron, reset_out_n, rsvd1, rsvd2, rsvd3,
  rsvd4, sdmmc1, sdmmc2, sdmmc3, sdmmc4, soc, spdif, spi1, spi2, spi3,
  spi4, spi5, spi6, sysclk, trace, uarta, uartb, uartc, uartd, ulpi,
  usb, vgp1, vgp2, vgp3, vgp4, vgp5, vgp6, vi, vi_alt1, vi_alt3

Example:

	pinmux: pinmux {
		compatible = "nvidia,tegra114-pinmux";
		reg = <0x70000868 0x148		/* Pad control registers */
		       0x70003000 0x40c>;	/* PinMux registers */
	};

Example board file extract:

	pinctrl {
		sdmmc4_default: pinmux {
			sdmmc4_clk_pcc4 {
				nvidia,pins = "sdmmc4_clk_pcc4",
				nvidia,function = "sdmmc4";
				nvidia,pull = <0>;
				nvidia,tristate = <0>;
			};
			sdmmc4_dat0_paa0 {
				nvidia,pins = "sdmmc4_dat0_paa0",
						"sdmmc4_dat1_paa1",
						"sdmmc4_dat2_paa2",
						"sdmmc4_dat3_paa3",
						"sdmmc4_dat4_paa4",
						"sdmmc4_dat5_paa5",
						"sdmmc4_dat6_paa6",
						"sdmmc4_dat7_paa7";
				nvidia,function = "sdmmc4";
				nvidia,pull = <2>;
				nvidia,tristate = <0>;
			};
		};
	};

	sdhci@78000400 {
		pinctrl-names = "default";
		pinctrl-0 = <&sdmmc4_default>;
	};