pinctrl: Broadcom Northstar2 pinctrl device tree bindings

Device tree binding documentation for Broadcom NS2 IOMUX

Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,ns2-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,ns2-pinmux.txt
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index 0000000..e295dda
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+++ b/Documentation/devicetree/bindings/pinctrl/brcm,ns2-pinmux.txt
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+Broadcom Northstar2 IOMUX Controller
+
+The Northstar2 IOMUX controller supports group based mux configuration. There
+are some individual pins that support modifying the pinconf parameters.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,ns2-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the
+    Northstar2 IOMUX and pin configuration registers.
+
+Properties in sub nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+- pins:
+    List of pin names to change configuration
+
+The generic properties bias-disable, bias-pull-down, bias-pull-up,
+drive-strength, slew-rate, input-enable, input-disable are supported
+for some individual pins listed at the end.
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+       pinctrl: pinctrl@6501d130 {
+               compatible = "brcm,ns2-pinmux";
+               reg = <0x6501d130 0x08>,
+                     <0x660a0028 0x04>,
+                     <0x660009b0 0x40>;
+
+               pinctrl-names = "default";
+               pinctrl-0 = <&nand_sel &uart3_rx &sdio0_d4>;
+
+               /* Select nand function */
+               nand_sel: nand_sel {
+                       function = "nand";
+                       groups = "nand_grp";
+               };
+
+               /* Pull up the uart3 rx pin */
+               uart3_rx: uart3_rx {
+                       pins = "uart3_sin";
+                       bias-pull-up;
+               };
+
+               /* Set the drive strength of sdio d4 pin */
+               sdio0_d4: sdio0_d4 {
+                       pins = "sdio0_data4";
+                       drive-strength = <8>;
+               };
+       };
+
+List of supported functions and groups in Northstar2:
+
+"nand": "nand_grp"
+
+"nor": "nor_data_grp", "nor_adv_grp", "nor_addr_0_3_grp", "nor_addr_4_5_grp",
+       "nor_addr_6_7_grp", "nor_addr_8_9_grp", "nor_addr_10_11_grp",
+       "nor_addr_12_15_grp"
+
+"gpio": "gpio_0_1_grp", "gpio_2_5_grp", "gpio_6_7_grp", "gpio_8_9_grp",
+       "gpio_10_11_grp", "gpio_12_13_grp", "gpio_14_17_grp", "gpio_18_19_grp",
+       "gpio_20_21_grp", "gpio_22_23_grp", "gpio_24_25_grp", "gpio_26_27_grp",
+       "gpio_28_29_grp", "gpio_30_31_grp"
+
+"pcie": "pcie_ab1_clk_wak_grp", "pcie_a3_clk_wak_grp", "pcie_b3_clk_wak_grp",
+       "pcie_b2_clk_wak_grp", "pcie_a2_clk_wak_grp"
+
+"uart0": "uart0_modem_grp", "uart0_rts_cts_grp", "uart0_in_out_grp"
+
+"uart1": "uart1_ext_clk_grp", "uart1_dcd_dsr_grp", "uart1_ri_dtr_grp",
+       "uart1_rts_cts_grp", "uart1_in_out_grp"
+
+"uart2": "uart2_rts_cts_grp"
+
+"pwm": "pwm_0_grp", "pwm_1_grp", "pwm_2_grp", "pwm_3_grp"
+
+
+List of pins that support pinconf parameters:
+
+"qspi_wp", "qspi_hold", "qspi_cs", "qspi_sck", "uart3_sin", "uart3_sout",
+"qspi_mosi", "qspi_miso", "spi0_fss", "spi0_rxd", "spi0_txd", "spi0_sck",
+"spi1_fss", "spi1_rxd", "spi1_txd", "spi1_sck", "sdio0_data7",
+"sdio0_emmc_rst", "sdio0_led_on", "sdio0_wp", "sdio0_data3", "sdio0_data4",
+"sdio0_data5", "sdio0_data6", "sdio0_cmd", "sdio0_data0", "sdio0_data1",
+"sdio0_data2", "sdio1_led_on", "sdio1_wp", "sdio0_cd_l", "sdio0_clk",
+"sdio1_data5", "sdio1_data6", "sdio1_data7", "sdio1_emmc_rst", "sdio1_data1",
+"sdio1_data2", "sdio1_data3", "sdio1_data4", "sdio1_cd_l", "sdio1_clk",
+"sdio1_cmd", "sdio1_data0", "ext_mdio_0", "ext_mdc_0", "usb3_p1_vbus_ppc",
+"usb3_p1_overcurrent", "usb3_p0_vbus_ppc", "usb3_p0_overcurrent",
+"usb2_presence_indication", "usb2_vbus_present", "usb2_vbus_ppc",
+"usb2_overcurrent", "sata_led1", "sata_led0"