dt-bindings: pinctrl: Add bindings for Actions S900 SoC

Add pinctrl bindings for Actions Semi S900 SoC
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/actions,s900-pinctrl.txt

+Actions Semi S900 Pin Controller
+
+This binding describes the pin controller found in the S900 SoC.
+
+Required Properties:
+
+- compatible:   Should be "actions,s900-pinctrl"
+- reg:          Should contain the register base address and size of
+                the pin controller.
+- clocks:       phandle of the clock feeding the pin controller
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices, including the meaning of the
+phrase "pin configuration node".
+
+The pin configuration nodes act as a container for an arbitrary number of
+subnodes. Each of these subnodes represents some desired configuration for a
+pin, a group, or a list of pins or groups. This configuration can include the
+mux function to select on those group(s), and various pin configuration
+parameters, such as pull-up, drive strength, etc.
+
+PIN CONFIGURATION NODES:
+
+The name of each subnode is not important; all subnodes should be enumerated
+and processed purely based on their content.
+
+Each subnode only affects those parameters that are explicitly listed. In
+other words, a subnode that lists a mux function but no pin configuration
+parameters implies no information about any pin configuration parameters.
+Similarly, a pin subnode that describes a pullup parameter implies no
+information about e.g. the mux function.
+
+Pinmux functions are available only for the pin groups while pinconf
+parameters are available for both pin groups and individual pins.
+
+The following generic properties as defined in pinctrl-bindings.txt are valid
+to specify in a pin configuration subnode:
+
+Required Properties:
+
+- pins:           An array of strings, each string containing the name of a pin.
+                  These pins are used for selecting the pull control and schmitt
+                  trigger parameters. The following are the list of pins
+                  available:
+
+                  eth_txd0, eth_txd1, eth_txen, eth_rxer, eth_crs_dv,
+                  eth_rxd1, eth_rxd0, eth_ref_clk, eth_mdc, eth_mdio,
+                  sirq0, sirq1, sirq2, i2s_d0, i2s_bclk0, i2s_lrclk0,
+                  i2s_mclk0, i2s_d1, i2s_bclk1, i2s_lrclk1, i2s_mclk1,
+                  pcm1_in, pcm1_clk, pcm1_sync, pcm1_out, eram_a5,
+                  eram_a6, eram_a7, eram_a8, eram_a9, eram_a10, eram_a11,
+                  lvds_oep, lvds_oen, lvds_odp, lvds_odn, lvds_ocp,
+                  lvds_ocn, lvds_obp, lvds_obn, lvds_oap, lvds_oan,
+                  lvds_eep, lvds_een, lvds_edp, lvds_edn, lvds_ecp,
+                  lvds_ecn, lvds_ebp, lvds_ebn, lvds_eap, lvds_ean,
+                  sd0_d0, sd0_d1, sd0_d2, sd0_d3, sd1_d0, sd1_d1,
+                  sd1_d2, sd1_d3, sd0_cmd, sd0_clk, sd1_cmd, sd1_clk,
+                  spi0_sclk, spi0_ss, spi0_miso, spi0_mosi, uart0_rx,
+                  uart0_tx, uart2_rx, uart2_tx, uart2_rtsb, uart2_ctsb,
+                  uart3_rx, uart3_tx, uart3_rtsb, uart3_ctsb, uart4_rx,
+                  uart4_tx, i2c0_sclk, i2c0_sdata, i2c1_sclk, i2c1_sdata,
+                  i2c2_sclk, i2c2_sdata, csi0_dn0, csi0_dp0, csi0_dn1,
+                  csi0_dp1, csi0_cn, csi0_cp, csi0_dn2, csi0_dp2, csi0_dn3,
+                  csi0_dp3, dsi_dp3, dsi_dn3, dsi_dp1, dsi_dn1, dsi_cp,
+                  dsi_cn, dsi_dp0, dsi_dn0, dsi_dp2, dsi_dn2, sensor0_pclk,
+                  csi1_dn0,csi1_dp0,csi1_dn1, csi1_dp1, csi1_cn, csi1_cp,
+                  sensor0_ckout, nand0_d0, nand0_d1, nand0_d2, nand0_d3,
+                  nand0_d4, nand0_d5, nand0_d6, nand0_d7, nand0_dqs,
+                  nand0_dqsn, nand0_ale, nand0_cle, nand0_ceb0, nand0_ceb1,
+                  nand0_ceb2, nand0_ceb3, nand1_d0, nand1_d1, nand1_d2,
+                  nand1_d3, nand1_d4, nand1_d5, nand1_d6, nand1_d7, nand1_dqs,
+                  nand1_dqsn, nand1_ale, nand1_cle, nand1_ceb0, nand1_ceb1,
+                  nand1_ceb2, nand1_ceb3, sgpio0, sgpio1, sgpio2, sgpio3
+
+- groups:         An array of strings, each string containing the name of a pin
+                  group. These pin groups are used for selecting the pinmux
+                  functions.
+
+                  lvds_oxx_uart4_mfp, rmii_mdc_mfp, rmii_mdio_mfp, sirq0_mfp,
+                  sirq1_mfp, rmii_txd0_mfp, rmii_txd1_mfp, rmii_txen_mfp,
+                  rmii_rxer_mfp, rmii_crs_dv_mfp, rmii_rxd1_mfp, rmii_rxd0_mfp,
+                  rmii_ref_clk_mfp, i2s_d0_mfp, i2s_d1_mfp, i2s_lr_m_clk0_mfp,
+                  i2s_bclk0_mfp, i2s_bclk1_mclk1_mfp, pcm1_in_out_mfp,
+                  pcm1_clk_mfp, pcm1_sync_mfp, eram_a5_mfp, eram_a6_mfp,
+                  eram_a7_mfp, eram_a8_mfp, eram_a9_mfp, eram_a10_mfp,
+                  eram_a11_mfp, lvds_oep_odn_mfp, lvds_ocp_obn_mfp,
+                  lvds_oap_oan_mfp, lvds_e_mfp, spi0_sclk_mosi_mfp, spi0_ss_mfp,
+                  spi0_miso_mfp, uart2_rtsb_mfp, uart2_ctsb_mfp, uart3_rtsb_mfp,
+                  uart3_ctsb_mfp, sd0_d0_mfp, sd0_d1_mfp, sd0_d2_d3_mfp,
+                  sd1_d0_d3_mfp, sd0_cmd_mfp, sd0_clk_mfp, sd1_cmd_clk_mfp,
+                  uart0_rx_mfp, nand0_d0_ceb3_mfp, uart0_tx_mfp, i2c0_mfp,
+                  csi0_cn_cp_mfp, csi0_dn0_dp3_mfp, csi1_dn0_cp_mfp,
+                  dsi_dp3_dn1_mfp, dsi_cp_dn0_mfp, dsi_dp2_dn2_mfp,
+                  nand1_d0_ceb1_mfp, nand1_ceb3_mfp, nand1_ceb0_mfp,
+                  csi1_dn0_dp0_mfp, uart4_rx_tx_mfp
+
+
+                  These pin groups are used for selecting the drive strength
+                  parameters.
+
+                  sgpio3_drv, sgpio2_drv, sgpio1_drv, sgpio0_drv,
+                  rmii_tx_d0_d1_drv, rmii_txen_rxer_drv, rmii_crs_dv_drv,
+                  rmii_rx_d1_d0_drv, rmii_ref_clk_drv, rmii_mdc_mdio_drv,
+                  sirq_0_1_drv, sirq2_drv, i2s_d0_d1_drv, i2s_lr_m_clk0_drv,
+                  i2s_blk1_mclk1_drv, pcm1_in_out_drv, lvds_oap_oan_drv,
+                  lvds_oep_odn_drv, lvds_ocp_obn_drv, lvds_e_drv, sd0_d3_d0_drv,
+                  sd1_d3_d0_drv, sd0_sd1_cmd_clk_drv, spi0_sclk_mosi_drv,
+                  spi0_ss_miso_drv, uart0_rx_tx_drv, uart4_rx_tx_drv, uart2_drv,
+                  uart3_drv, i2c0_drv, i2c1_drv, i2c2_drv, sensor0_drv
+
+                  These pin groups are used for selecting the slew rate
+                  parameters.
+
+                  sgpio3_sr, sgpio2_sr, sgpio1_sr, sgpio0_sr, rmii_tx_d0_d1_sr,
+                  rmii_txen_rxer_sr, rmii_crs_dv_sr, rmii_rx_d1_d0_sr,
+                  rmii_ref_clk_sr, rmii_mdc_mdio_sr, sirq_0_1_sr, sirq2_sr,
+                  i2s_do_d1_sr, i2s_lr_m_clk0_sr, i2s_bclk0_mclk1_sr,
+                  pcm1_in_out_sr, sd1_d3_d0_sr, sd0_sd1_clk_cmd_sr,
+                  spi0_sclk_mosi_sr, spi0_ss_miso_sr, uart0_rx_tx_sr,
+                  uart4_rx_tx_sr, uart2_sr, uart3_sr, i2c0_sr, i2c1_sr, i2c2_sr,
+                  sensor0_sr
+
+- function:       An array of strings, each string containing the name of the
+                  pinmux functions. These functions can only be selected by
+                  the corresponding pin groups. The following are the list of
+                  pinmux functions available:
+
+                  eram, eth_rmii, eth_smii, spi0, spi1, spi2, spi3, sens0,
+                  uart0, uart1, uart2, uart3, uart4, uart5, uart6, i2s0, i2s1,
+                  pcm0, pcm1, jtag, pwm0, pwm1, pwm2, pwm3, pwm4, pwm5, sd0,
+                  sd1, sd2, sd3, i2c0, i2c1, i2c2, i2c3, i2c4, i2c5, lvds,
+                  usb30, usb20, gpu, mipi_csi0, mipi_csi1, mipi_dsi, nand0,
+                  nand1, spdif, sirq0, sirq1, sirq2
+
+Optional Properties:
+
+- bias-bus-hold:  No arguments. The specified pins should retain the previous
+                  state value.
+- bias-high-impedance: No arguments. The specified pins should be configured
+                  as high impedance.
+- bias-pull-down: No arguments. The specified pins should be configured as
+                  pull down.
+- bias-pull-up:   No arguments. The specified pins should be configured as
+                  pull up.
+- input-schmitt-enable: No arguments: Enable schmitt trigger for the specified
+                  pins
+- input-schmitt-disable: No arguments: Disable schmitt trigger for the specified
+                  pins
+- slew-rate:      Integer. Sets slew rate for the specified pins.
+                  Valid values are:
+                  <0>  - Slow
+                  <1>  - Fast
+- drive-strength: Integer. Selects the drive strength for the specified
+                  pins in mA.
+                  Valid values are:
+                  <2>
+                  <4>
+                  <8>
+                  <12>
+
+Example:
+
+          pinctrl: pinctrl@e01b0000 {
+                  compatible = "actions,s900-pinctrl";
+                  reg = <0x0 0xe01b0000 0x0 0x1000>;
+                  clocks = <&cmu CLK_GPIO>;
+
+                  uart2-default: uart2-default {
+                          pinmux {
+                                  groups = "lvds_oep_odn_mfp";
+                                  function = "uart2";
+                          };
+                          pinconf {
+                                  groups = "lvds_oep_odn_drv";
+                                  drive-strength = <12>;
+                          };
+                  };
+          };