NVIDIA Tegra124 pinmux controller

The Tegra124 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,tegra124-pinmux"
- reg: Should contain a list of base address and size pairs for:
    -- first entry - the drive strength and pad control registers.
    -- second entry - the pinmux registers

Tegra124 adds the following optional properties for pin configuration subnodes.
The macros for options are defined in the
	include/dt-binding/pinctrl/pinctrl-tegra.h.
- nvidia,enable-input: Integer. Enable the pin's input path.
		enable :TEGRA_PIN_ENABLE0 and
		disable or output only: TEGRA_PIN_DISABLE.
- nvidia,open-drain: Integer.
		enable: TEGRA_PIN_ENABLE.
		disable: TEGRA_PIN_DISABLE.
- nvidia,lock: Integer. Lock the pin configuration against further changes
    until reset.
		enable: TEGRA_PIN_ENABLE.
		disable: TEGRA_PIN_DISABLE.
- nvidia,io-reset: Integer. Reset the IO path.
		enable: TEGRA_PIN_ENABLE.
		disable: TEGRA_PIN_DISABLE.
- nvidia,rcv-sel: Integer. Select VIL/VIH receivers.
		normal: TEGRA_PIN_DISABLE
		high: TEGRA_PIN_ENABLE

Please refer 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. Some support nvidia,lock 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_scl_pc4,
	gen1_i2c_sda_pc5, dap4_fs_pp4, dap4_din_pp5, dap4_dout_pp6,
	dap4_sclk_pp7, clk3_out_pee0, clk3_req_pee1, pc7, pi5, pi7, pk0, pk1,
	pj0, pj2, pk3, pk4, pk2, pi3, pi6, pg0, pg1, pg2, pg3, pg4, pg5, pg6,
	pg7, ph0, ph1, ph2, ph3, ph4, ph5, ph6, ph7, pj7, pb0, pb1, pk7, pi0,
	pi1, pi2, 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, jtag_rtck,
	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_row11_ps3, kb_row12_ps4,
	kb_row13_ps5, kb_row14_ps6, kb_row15_ps7, 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, core_pwr_req, cpu_pwr_req, pwr_int_n,
	clk_32k_in, owr, dap1_fs_pn0, dap1_din_pn1, dap1_dout_pn2,
	dap1_sclk_pn3, dap_mclk1_req_pee2, dap_mclk1_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, pex_l0_rst_n_pdd1,
	pex_l0_clkreq_n_pdd2, pex_wake_n_pdd3, pex_l1_rst_n_pdd5,
	pex_l1_clkreq_n_pdd6, 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_out_pee4, sdmmc3_clk_lb_in_pee5,
	gmi_clk_lb, reset_out_n, kb_row16_pt0, kb_row17_pt1, usb_vbus_en2_pff1,
	pff2, dp_hpd_pff0,

  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, gpv, dev3, cec, usb_vbus_en, ao3, ao0, hv0, sdio4, ao4.

Valid values for nvidia,functions are:

  blink, cec, cldvfs, clk12, cpu, dap, dap1, dap2, dev3, displaya,
  displaya_alt, displayb, dtv, extperiph1, extperiph2, extperiph3,
  gmi, gmi_alt, hda, hsi, i2c1, i2c2, i2c3, i2c4, i2cpwr, i2s0,
  i2s1, i2s2, i2s3, i2s4, irda, kbc, 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, trace, uarta,
  uartb, uartc, uartd, ulpi, usb, vgp1, vgp2, vgp3, vgp4, vgp5, vgp6,
  vi, vi_alt1, vi_alt3, vimclk2, vimclk2_alt, sata, ccla, pe0, pe, pe1,
  dp, rtck, sys, clk tmds.

Example:

	pinmux: pinmux {
		compatible = "nvidia,tegra124-pinmux";
		reg = <0x70000868 0x164		/* Pad control registers */
		       0x70003000 0x434>;	/* PinMux registers */
	};

Example pinmux entries:

	pinctrl {
		sdmmc4_default: pinmux {
			sdmmc4_clk_pcc4 {
				nvidia,pins = "sdmmc4_clk_pcc4",
				nvidia,function = "sdmmc4";
				nvidia,pull = <TEGRA_PIN_PULL_NONE>;
				nvidia,tristate = <TEGRA_PIN_DISABLE>;
			};

			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 = <TEGRA_PIN_PULL_UP>;
				nvidia,tristate = <TEGRA_PIN_DISABLE>;
			};
		};
	};

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