ARM: tegra: define valid function names in DT document

List valid values for the property "nvidia,function" in
DT binding document of Tegra pincontrol.

Signed-off-by: Laxman Dewangan <[e-mail]>
[swarren, whitespace fixes, grammar consistency fixes, section
ordering fixes]
Signed-off-by: Stephen Warren <[e-mail]>

Documentation/devicetree/bindings/pinctrl/nvidia,tegra114-pinmux.txt

···
     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 {

Documentation/devicetree/bindings/pinctrl/nvidia,tegra20-pinmux.txt

···
     drive_gma, drive_gmb, drive_gmc, drive_gmd, drive_gme, drive_owr,
     drive_uda.
 
+Valid values for nvidia,functions are:
+
+  ahb_clk, apb_clk, audio_sync, crt, dap1, dap2, dap3, dap4, dap5,
+  displaya, displayb, emc_test0_dll, emc_test1_dll, gmi, gmi_int,
+  hdmi, i2cp, i2c1, i2c2, i2c3, ide, irda, kbc, mio, mipi_hs, nand,
+  osc, owr, pcie, plla_out, pllc_out1, pllm_out1, pllp_out2, pllp_out3,
+  pllp_out4, pwm, pwr_intr, pwr_on, rsvd1, rsvd2, rsvd3, rsvd4, rtck,
+  sdio1, sdio2, sdio3, sdio4, sflash, spdif, spi1, spi2, spi2_alt,
+  spi3, spi4, trace, twc, uarta, uartb, uartc, uartd, uarte, ulpi,
+  vi, vi_sensor_clk, xio
+
 Example:
 
 	pinctrl@70000000 {

Documentation/devicetree/bindings/pinctrl/nvidia,tegra30-pinmux.txt

···
     gmh, gpv, lcd1, lcd2, owr, sdio1, sdio2, sdio3, spi, uaa, uab, uart2,
     uart3, uda, vi1.
 
+Valid values for nvidia,functions are:
+
+  blink, cec, clk_12m_out, clk_32k_in, core_pwr_req, cpu_pwr_req, crt,
+  dap, ddr, dev3, displaya, displayb, dtv, extperiph1, extperiph2,
+  extperiph3, gmi, gmi_alt, hda, hdcp, hdmi, hsi, i2c1, i2c2, i2c3,
+  i2c4, i2cpwr, i2s0, i2s1, i2s2, i2s3, i2s4, invalid, kbc, mio, nand,
+  nand_alt, owr, pcie, pwm0, pwm1, pwm2, pwm3, pwr_int_n, rsvd1, rsvd2,
+  rsvd3, rsvd4, rtck, sata, sdmmc1, sdmmc2, sdmmc3, sdmmc4, spdif, spi1,
+  spi2, spi2_alt, spi3, spi4, spi5, spi6, sysclk, test, trace, uarta,
+  uartb, uartc, uartd, uarte, ulpi, vgp1, vgp2, vgp3, vgp4, vgp5, vgp6,
+  vi, vi_alt1, vi_alt2, vi_alt3
+
 Example:
 
 	pinctrl@70000000 {