pinctrl-tz1090: add TZ1090 pinctrl driver

ImgTec TZ1090 pin controller

Required properties:

- compatible: "img,tz1090-pinctrl"

- reg: Should contain the register physical address and length of the pad

  configuration registers (CR_PADS_* and CR_IF_CTL0).

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".

TZ1090's pin configuration nodes act as a container for an abitrary 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 pin(s)/group(s), and various pin configuration

parameters, such as pull-up, drive strength, etc.

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. For this reason, even seemingly boolean

values are actually tristates in this binding: unspecified, off, or on.

Unspecified is represented as an absent property, and off/on are represented as

integer values 0 and 1.

Required subnode-properties:

- tz1090,pins : An array of strings. Each string contains the name of a pin or

  group. Valid values for these names are listed below.

Optional subnode-properties:

- tz1090,function: A string containing the name of the function to mux to the

  pin or group. Valid values for function names are listed below, including

  which pingroups can be muxed to them.

- supported generic pinconfig properties (for further details see

  Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt):

  - bias-disable

  - bias-high-impedance

  - bias-bus-hold

  - bias-pull-up

  - bias-pull-down

  - input-schmitt-enable

  - input-schmitt-disable

  - slew-rate: Integer, control slew rate of pins.

      0: slow (half frequency)

      1: fast

  - drive-strength: Integer, control drive strength of pins in mA.

      2: 2mA

      4: 4mA

      8: 8mA

      12: 12mA

Note that many of these properties are only valid for certain specific pins

or groups. See the TZ1090 TRM for complete details regarding which groups

support which functionality. The Linux pinctrl driver may also be a useful

reference.

Valid values for pin and group names are:

  gpio pins:

    These all support bias-high-impediance, bias-pull-up, bias-pull-down, and

    bias-bus-hold (which can also be provided to any of the groups below to set

    it for all pins in that group).

    They also all support the some form of muxing. Any pins which are contained

    in one of the mux groups (see below) can be muxed only to the functions

    supported by the mux group. All other pins can be muxed to the "perip"

    function which which enables them with their intended peripheral.

    Different pins in the same mux group cannot be muxed to different functions,

    however it is possible to mux only a subset of the pins in a mux group to a

    particular function and leave the remaining pins unmuxed. This is useful if

    the board connects certain pins in a group to other devices to be controlled

    by GPIO, and you don't want the usual peripheral to have any control of the

    pin.

    ant_sel0, ant_sel1, gain0, gain1, gain2, gain3, gain4, gain5, gain6, gain7,

    i2s_bclk_out, i2s_din, i2s_dout0, i2s_dout1, i2s_dout2, i2s_lrclk_out,

    i2s_mclk, pa_on, pdm_a, pdm_b, pdm_c, pdm_d, pll_on, rx_hp, rx_on,

    scb0_sclk, scb0_sdat, scb1_sclk, scb1_sdat, scb2_sclk, scb2_sdat, sdh_cd,

    sdh_clk_in, sdh_wp, sdio_clk, sdio_cmd, sdio_d0, sdio_d1, sdio_d2, sdio_d3,

    spi0_cs0, spi0_cs1, spi0_cs2, spi0_din, spi0_dout, spi0_mclk, spi1_cs0,

    spi1_cs1, spi1_cs2, spi1_din, spi1_dout, spi1_mclk, tft_blank_ls, tft_blue0,

    tft_blue1, tft_blue2, tft_blue3, tft_blue4, tft_blue5, tft_blue6, tft_blue7,

    tft_green0, tft_green1, tft_green2, tft_green3, tft_green4, tft_green5,

    tft_green6, tft_green7, tft_hsync_nr, tft_panelclk, tft_pwrsave, tft_red0,

    tft_red1, tft_red2, tft_red3, tft_red4, tft_red5, tft_red6, tft_red7,

    tft_vd12acb, tft_vdden_gd, tft_vsync_ns, tx_on, uart0_cts, uart0_rts,

    uart0_rxd, uart0_txd, uart1_rxd, uart1_txd.

        bias-high-impediance:  supported.

        bias-pull-up:          supported.

        bias-pull-down:        supported.

        bias-bus-hold:         supported.

        function:              perip or those supported by pin's mux group.

  other pins:

    These other pins are part of various pin groups below, but can't be

    controlled as GPIOs. They do however support bias-high-impediance,

    bias-pull-up, bias-pull-down, and bias-bus-hold (which can also be provided

    to any of the groups below to set it for all pins in that group).

    clk_out0, clk_out1, tck, tdi, tdo, tms, trst.

        bias-high-impediance:  supported.

        bias-pull-up:          supported.

        bias-pull-down:        supported.

        bias-bus-hold:         supported.

  mux groups:

    These all support function, and some support drive configs.

    afe

        pins:                  tx_on, rx_on, pll_on, pa_on, rx_hp, ant_sel0,

                               ant_sel1, gain0, gain1, gain2, gain3, gain4,

                               gain5, gain6, gain7.

        function:              afe, ts_out_0.

        input-schmitt-enable:  supported.

        input-schmitt-disable: supported.

        slew-rate:             supported.

        drive-strength:        supported.

    pdm_d

        pins:                  pdm_d.

        function:              pdm_dac, usb_vbus.

    sdh

        pins:                  sdh_cd, sdh_wp, sdh_clk_in.

        function:              sdh, sdio.

    sdio

        pins:                  sdio_clk, sdio_cmd, sdio_d0, sdio_d1, sdio_d2,

                               sdio_d3.

        function:              sdio, sdh.

    spi1_cs2

        pins:                  spi1_cs2.

        function:              spi1_cs2, usb_vbus.

    tft

        pins:                  tft_red0, tft_red1, tft_red2, tft_red3,

                               tft_red4, tft_red5, tft_red6, tft_red7,

                               tft_green0, tft_green1, tft_green2, tft_green3,

                               tft_green4, tft_green5, tft_green6, tft_green7,

                               tft_blue0, tft_blue1, tft_blue2, tft_blue3,

                               tft_blue4, tft_blue5, tft_blue6, tft_blue7,

                               tft_vdden_gd, tft_panelclk, tft_blank_ls,

                               tft_vsync_ns, tft_hsync_nr, tft_vd12acb,

                               tft_pwrsave.

        function:              tft, ext_dac, not_iqadc_stb, iqdac_stb, ts_out_1,

                               lcd_trace, phy_ringosc.

        input-schmitt-enable:  supported.

        input-schmitt-disable: supported.

        slew-rate:             supported.

        drive-strength:        supported.

  drive groups:

    These all support input-schmitt-enable, input-schmitt-disable, slew-rate,

    and drive-strength.

    jtag

        pins:   tck, trst, tdi, tdo, tms.

    scb1

        pins:   scb1_sdat, scb1_sclk.

    scb2

        pins:   scb2_sdat, scb2_sclk.

    spi0

        pins:   spi0_mclk, spi0_cs0, spi0_cs1, spi0_cs2, spi0_dout, spi0_din.

    spi1

        pins:   spi1_mclk, spi1_cs0, spi1_cs1, spi1_cs2, spi1_dout, spi1_din.

    uart

        pins:   uart0_txd, uart0_rxd, uart0_rts, uart0_cts,

                uart1_txd, uart1_rxd.

    drive_i2s

        pins:   clk_out1, i2s_din, i2s_dout0, i2s_dout1, i2s_dout2,

                i2s_lrclk_out, i2s_bclk_out, i2s_mclk.

    drive_pdm

        pins:   clk_out0, pdm_b, pdm_a.

    drive_scb0

        pins:   scb0_sclk, scb0_sdat, pdm_d, pdm_c.

    drive_sdio

        pins:   sdio_clk, sdio_cmd, sdio_d0, sdio_d1, sdio_d2, sdio_d3,

                sdh_wp, sdh_cd, sdh_clk_in.

  convenience groups:

    These are just convenient groupings of pins and don't support any drive

    configs.

    uart0

        pins:   uart0_cts, uart0_rts, uart0_rxd, uart0_txd.

    uart1

        pins:   uart1_rxd, uart1_txd.

    scb0

        pins:   scb0_sclk, scb0_sdat.

    i2s

        pins:   i2s_bclk_out, i2s_din, i2s_dout0, i2s_dout1, i2s_dout2,

                i2s_lrclk_out, i2s_mclk.

Example:

	pinctrl: pinctrl@02005800 {

		#gpio-range-cells = <3>;

		compatible = "img,tz1090-pinctrl";

		reg = <0x02005800 0xe4>;

	};

Example board file extract:

	&pinctrl {

		uart0_default: uart0 {

			uart0_cfg {

				tz1090,pins =	"uart0_rxd",

						"uart0_txd";

				tz1090,function = "perip";

			};

		};

		tft_default: tft {

			tft_cfg {

				tz1090,pins =	"tft";

				tz1090,function = "tft";

			};

		};

	};

	uart@02004b00 {

		pinctrl-names = "default";

		pinctrl-0 = <&uart0_default>;

	};

	bool

	select PINCTRL_TEGRA

config PINCTRL_TZ1090

	bool "Toumaz Xenif TZ1090 pin control driver"

	depends on SOC_TZ1090

	select PINMUX

	select GENERIC_PINCONF

config PINCTRL_U300

	bool "U300 pin controller driver"

	depends on ARCH_U300

obj-$(CONFIG_PINCTRL_TEGRA20)	+= pinctrl-tegra20.o

obj-$(CONFIG_PINCTRL_TEGRA30)	+= pinctrl-tegra30.o

obj-$(CONFIG_PINCTRL_TEGRA114)	+= pinctrl-tegra114.o

obj-$(CONFIG_PINCTRL_TZ1090)	+= pinctrl-tz1090.o

obj-$(CONFIG_PINCTRL_U300)	+= pinctrl-u300.o

obj-$(CONFIG_PINCTRL_COH901)	+= pinctrl-coh901.o

obj-$(CONFIG_PINCTRL_SAMSUNG)	+= pinctrl-samsung.o