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
- gpio-controller: Marks the device node as a GPIO controller.
- gpio-ranges: Specifies the mapping between gpio controller and
               pin-controller pins.
- #gpio-cells: Should be two. The first cell is the gpio pin number
               and the second cell is used for optional parameters.
- interrupt-controller: Marks the device node as an interrupt controller.
- #interrupt-cells: Specifies the number of cells needed to encode an
                    interrupt.  Shall be set to 2.  The first cell
                    defines the interrupt number, the second encodes
                    the trigger flags described in
                    bindings/interrupt-controller/interrupts.txt

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>;
                  gpio-controller;
                  gpio-ranges = <&pinctrl 0 0 146>;
                  #gpio-cells = <2>;
                  interrupt-controller;
                  #interrupt-cells = <2>;

                  uart2-default: uart2-default {
                          pinmux {
                                  groups = "lvds_oep_odn_mfp";
                                  function = "uart2";
                          };
                          pinconf {
                                  groups = "lvds_oep_odn_drv";
                                  drive-strength = <12>;
                          };
                  };
          };