Broadcom BCM281xx Pin Controller

This is a pin controller for the Broadcom BCM281xx SoC family, which includes
BCM11130, BCM11140, BCM11351, BCM28145, and BCM28155 SoCs.

=== Pin Controller Node ===

Required Properties:

- compatible:	Must be "brcm,bcm11351-pinctrl"
- reg:		Base address of the PAD Controller register block and the size
		of the block.

For example, the following is the bare minimum node:

	pinctrl@35004800 {
		compatible = "brcm,bcm11351-pinctrl";
		reg = <0x35004800 0x430>;
	};

As a pin controller device, in addition to the required properties, this node
should also contain the pin configuration nodes that client devices reference,
if any.

=== Pin Configuration Node ===

Each pin configuration node is a sub-node of the pin controller node and is a
container of an arbitrary number of subnodes, called pin group nodes in this
document.

Please refer to the pinctrl-bindings.txt in this directory for details of the
common pinctrl bindings used by client devices, including the definition of a
"pin configuration node".

=== Pin Group Node ===

A pin group node specifies the desired pin mux and/or pin configuration for an
arbitrary number of pins.  The name of the pin group node is optional and not
used.

A pin group node only affects the properties specified in the node, and has no
effect on any properties that are omitted.

The pin group node accepts a subset of the generic pin config properties. For
details generic pin config properties, please refer to pinctrl-bindings.txt
and <include/linux/pinctrl/pinconfig-generic.h>.

Each pin controlled by this pin controller belong to one of three types:
Standard, I2C, and HDMI.  Each type accepts a different set of pin config
properties.  A list of pins and their types is provided below.

Required Properties (applicable to all pins):

- pins:		Multiple strings.  Specifies the name(s) of one or more pins to
		be configured by this node.

Optional Properties (for standard pins):

- function:			String. Specifies the pin mux selection. Values
				must be one of: "alt1", "alt2", "alt3", "alt4"
- input-schmitt-enable:		No arguments. Enable schmitt-trigger mode.
- input-schmitt-disable:	No arguments. Disable schmitt-trigger mode.
- bias-pull-up:			No arguments. Pull up on pin.
- bias-pull-down:		No arguments. Pull down on pin.
- bias-disable:			No arguments. Disable pin bias.
- slew-rate:			Integer. Meaning depends on configured pin mux:
				*_SCL or *_SDA:
					0: Standard(100kbps)& Fast(400kbps) mode
					1: Highspeed (3.4Mbps) mode
				IC_DM or IC_DP:
					0: normal slew rate
					1: fast slew rate
				Otherwise:
					0: fast slew rate
					1: normal slew rate
- input-enable:			No arguements. Enable input (does not affect
				output.)
- input-disable:		No arguements. Disable input (does not affect
				output.)
- drive-strength:		Integer. Drive strength in mA.  Valid values are
				2, 4, 6, 8, 10, 12, 14, 16 mA.

Optional Properties (for I2C pins):

- function:			String. Specifies the pin mux selection. Values
				must be one of: "alt1", "alt2", "alt3", "alt4"
- bias-pull-up:			Integer. Pull up strength in Ohm. There are 3
				pull-up resisitors (1.2k, 1.8k, 2.7k) available
				in parallel for I2C pins, so the valid values
				are: 568, 720, 831, 1080, 1200, 1800, 2700 Ohm.
- bias-disable:			No arguments. Disable pin bias.
- slew-rate:			Integer. Meaning depends on configured pin mux:
				*_SCL or *_SDA:
					0: Standard(100kbps)& Fast(400kbps) mode
					1: Highspeed (3.4Mbps) mode
				IC_DM or IC_DP:
					0: normal slew rate
					1: fast slew rate
				Otherwise:
					0: fast slew rate
					1: normal slew rate
- input-enable:			No arguements. Enable input (does not affect
				output.)
- input-disable:		No arguements. Disable input (does not affect
				output.)

Optional Properties (for HDMI pins):

- function:			String. Specifies the pin mux selection. Values
				must be one of: "alt1", "alt2", "alt3", "alt4"
- slew-rate:			Integer. Controls slew rate.
					0: Standard(100kbps)& Fast(400kbps) mode
					1: Highspeed (3.4Mbps) mode
- input-enable:			No arguements. Enable input (does not affect
				output.)
- input-disable:		No arguements. Disable input (does not affect
				output.)

Example:
// pin controller node
pinctrl@35004800 {
	compatible = "brcmbcm11351-pinctrl";
	reg = <0x35004800 0x430>;

	// pin configuration node
	dev_a_default: dev_a_active {
		//group node defining 1 standard pin
		grp_1 {
			pins		= "std_pin1";
			function	= "alt1";
			input-schmitt-enable;
			bias-disable;
			slew-rate	= <1>;
			drive-strength	= <4>;
		};

		// group node defining 2 I2C pins
		grp_2 {
			pins		= "i2c_pin1", "i2c_pin2";
			function	= "alt2";
			bias-pull-up	= <720>;
			input-enable;
		};

		// group node defining 2 HDMI pins
		grp_3 {
			pins		= "hdmi_pin1", "hdmi_pin2";
			function	= "alt3";
			slew-rate	= <1>;
		};

		// other pin group nodes
		...
	};

	// other pin configuration nodes
	...
};

In the example above, "dev_a_active" is a pin configuration node with a number
of sub-nodes.  In the pin group node "grp_1", one pin, "std_pin1", is defined in
the "pins" property.  Thus, the remaining properties in the "grp_1" node applies
only to this pin, including the following settings:
 - setting pinmux to "alt1"
 - enabling schmitt-trigger (hystersis) mode
 - disabling pin bias
 - setting the slew-rate to 1
 - setting the drive strength to 4 mA
Note that neither "input-enable" nor "input-disable" was specified - the pinctrl
subsystem will therefore leave this property unchanged from whatever state it
was in before applying these changes.

The "pins" property in the pin group node "grp_2" specifies two pins -
"i2c_pin1" and "i2c_pin2"; the remaining properties in this pin group node,
therefore, applies to both of these pins.  The properties include:
 - setting pinmux to "alt2"
 - setting pull-up resistance to 720 Ohm (ie. enabling 1.2k and 1.8k resistors
   in parallel)
 - enabling both pins' input
"slew-rate" is not specified in this pin group node, so the slew-rate for these
pins are left as-is.

Finally, "grp_3" defines two HDMI pins.  The following properties are applied to
both pins:
 - setting pinmux to "alt3"
 - setting slew-rate to 1; for HDMI pins, this corresponds to the 3.4 Mbps
   Highspeed mode
The input is neither enabled or disabled, and is left untouched.

=== Pin Names and Type ===

The following are valid pin names and their pin types:

	"adcsync",		Standard
	"bat_rm",		Standard
	"bsc1_scl",		I2C
	"bsc1_sda",		I2C
	"bsc2_scl",		I2C
	"bsc2_sda",		I2C
	"classgpwr",		Standard
	"clk_cx8",		Standard
	"clkout_0",		Standard
	"clkout_1",		Standard
	"clkout_2",		Standard
	"clkout_3",		Standard
	"clkreq_in_0",		Standard
	"clkreq_in_1",		Standard
	"cws_sys_req1",		Standard
	"cws_sys_req2",		Standard
	"cws_sys_req3",		Standard
	"digmic1_clk",		Standard
	"digmic1_dq",		Standard
	"digmic2_clk",		Standard
	"digmic2_dq",		Standard
	"gpen13",		Standard
	"gpen14",		Standard
	"gpen15",		Standard
	"gpio00",		Standard
	"gpio01",		Standard
	"gpio02",		Standard
	"gpio03",		Standard
	"gpio04",		Standard
	"gpio05",		Standard
	"gpio06",		Standard
	"gpio07",		Standard
	"gpio08",		Standard
	"gpio09",		Standard
	"gpio10",		Standard
	"gpio11",		Standard
	"gpio12",		Standard
	"gpio13",		Standard
	"gpio14",		Standard
	"gps_pablank",		Standard
	"gps_tmark",		Standard
	"hdmi_scl",		HDMI
	"hdmi_sda",		HDMI
	"ic_dm",		Standard
	"ic_dp",		Standard
	"kp_col_ip_0",		Standard
	"kp_col_ip_1",		Standard
	"kp_col_ip_2",		Standard
	"kp_col_ip_3",		Standard
	"kp_row_op_0",		Standard
	"kp_row_op_1",		Standard
	"kp_row_op_2",		Standard
	"kp_row_op_3",		Standard
	"lcd_b_0",		Standard
	"lcd_b_1",		Standard
	"lcd_b_2",		Standard
	"lcd_b_3",		Standard
	"lcd_b_4",		Standard
	"lcd_b_5",		Standard
	"lcd_b_6",		Standard
	"lcd_b_7",		Standard
	"lcd_g_0",		Standard
	"lcd_g_1",		Standard
	"lcd_g_2",		Standard
	"lcd_g_3",		Standard
	"lcd_g_4",		Standard
	"lcd_g_5",		Standard
	"lcd_g_6",		Standard
	"lcd_g_7",		Standard
	"lcd_hsync",		Standard
	"lcd_oe",		Standard
	"lcd_pclk",		Standard
	"lcd_r_0",		Standard
	"lcd_r_1",		Standard
	"lcd_r_2",		Standard
	"lcd_r_3",		Standard
	"lcd_r_4",		Standard
	"lcd_r_5",		Standard
	"lcd_r_6",		Standard
	"lcd_r_7",		Standard
	"lcd_vsync",		Standard
	"mdmgpio0",		Standard
	"mdmgpio1",		Standard
	"mdmgpio2",		Standard
	"mdmgpio3",		Standard
	"mdmgpio4",		Standard
	"mdmgpio5",		Standard
	"mdmgpio6",		Standard
	"mdmgpio7",		Standard
	"mdmgpio8",		Standard
	"mphi_data_0",		Standard
	"mphi_data_1",		Standard
	"mphi_data_2",		Standard
	"mphi_data_3",		Standard
	"mphi_data_4",		Standard
	"mphi_data_5",		Standard
	"mphi_data_6",		Standard
	"mphi_data_7",		Standard
	"mphi_data_8",		Standard
	"mphi_data_9",		Standard
	"mphi_data_10",		Standard
	"mphi_data_11",		Standard
	"mphi_data_12",		Standard
	"mphi_data_13",		Standard
	"mphi_data_14",		Standard
	"mphi_data_15",		Standard
	"mphi_ha0",		Standard
	"mphi_hat0",		Standard
	"mphi_hat1",		Standard
	"mphi_hce0_n",		Standard
	"mphi_hce1_n",		Standard
	"mphi_hrd_n",		Standard
	"mphi_hwr_n",		Standard
	"mphi_run0",		Standard
	"mphi_run1",		Standard
	"mtx_scan_clk",		Standard
	"mtx_scan_data",	Standard
	"nand_ad_0",		Standard
	"nand_ad_1",		Standard
	"nand_ad_2",		Standard
	"nand_ad_3",		Standard
	"nand_ad_4",		Standard
	"nand_ad_5",		Standard
	"nand_ad_6",		Standard
	"nand_ad_7",		Standard
	"nand_ale",		Standard
	"nand_cen_0",		Standard
	"nand_cen_1",		Standard
	"nand_cle",		Standard
	"nand_oen",		Standard
	"nand_rdy_0",		Standard
	"nand_rdy_1",		Standard
	"nand_wen",		Standard
	"nand_wp",		Standard
	"pc1",			Standard
	"pc2",			Standard
	"pmu_int",		Standard
	"pmu_scl",		I2C
	"pmu_sda",		I2C
	"rfst2g_mtsloten3g",	Standard
	"rgmii_0_rx_ctl",	Standard
	"rgmii_0_rxc",		Standard
	"rgmii_0_rxd_0",	Standard
	"rgmii_0_rxd_1",	Standard
	"rgmii_0_rxd_2",	Standard
	"rgmii_0_rxd_3",	Standard
	"rgmii_0_tx_ctl",	Standard
	"rgmii_0_txc",		Standard
	"rgmii_0_txd_0",	Standard
	"rgmii_0_txd_1",	Standard
	"rgmii_0_txd_2",	Standard
	"rgmii_0_txd_3",	Standard
	"rgmii_1_rx_ctl",	Standard
	"rgmii_1_rxc",		Standard
	"rgmii_1_rxd_0",	Standard
	"rgmii_1_rxd_1",	Standard
	"rgmii_1_rxd_2",	Standard
	"rgmii_1_rxd_3",	Standard
	"rgmii_1_tx_ctl",	Standard
	"rgmii_1_txc",		Standard
	"rgmii_1_txd_0",	Standard
	"rgmii_1_txd_1",	Standard
	"rgmii_1_txd_2",	Standard
	"rgmii_1_txd_3",	Standard
	"rgmii_gpio_0",		Standard
	"rgmii_gpio_1",		Standard
	"rgmii_gpio_2",		Standard
	"rgmii_gpio_3",		Standard
	"rtxdata2g_txdata3g1",	Standard
	"rtxen2g_txdata3g2",	Standard
	"rxdata3g0",		Standard
	"rxdata3g1",		Standard
	"rxdata3g2",		Standard
	"sdio1_clk",		Standard
	"sdio1_cmd",		Standard
	"sdio1_data_0",		Standard
	"sdio1_data_1",		Standard
	"sdio1_data_2",		Standard
	"sdio1_data_3",		Standard
	"sdio4_clk",		Standard
	"sdio4_cmd",		Standard
	"sdio4_data_0",		Standard
	"sdio4_data_1",		Standard
	"sdio4_data_2",		Standard
	"sdio4_data_3",		Standard
	"sim_clk",		Standard
	"sim_data",		Standard
	"sim_det",		Standard
	"sim_resetn",		Standard
	"sim2_clk",		Standard
	"sim2_data",		Standard
	"sim2_det",		Standard
	"sim2_resetn",		Standard
	"sri_c",		Standard
	"sri_d",		Standard
	"sri_e",		Standard
	"ssp_extclk",		Standard
	"ssp0_clk",		Standard
	"ssp0_fs",		Standard
	"ssp0_rxd",		Standard
	"ssp0_txd",		Standard
	"ssp2_clk",		Standard
	"ssp2_fs_0",		Standard
	"ssp2_fs_1",		Standard
	"ssp2_fs_2",		Standard
	"ssp2_fs_3",		Standard
	"ssp2_rxd_0",		Standard
	"ssp2_rxd_1",		Standard
	"ssp2_txd_0",		Standard
	"ssp2_txd_1",		Standard
	"ssp3_clk",		Standard
	"ssp3_fs",		Standard
	"ssp3_rxd",		Standard
	"ssp3_txd",		Standard
	"ssp4_clk",		Standard
	"ssp4_fs",		Standard
	"ssp4_rxd",		Standard
	"ssp4_txd",		Standard
	"ssp5_clk",		Standard
	"ssp5_fs",		Standard
	"ssp5_rxd",		Standard
	"ssp5_txd",		Standard
	"ssp6_clk",		Standard
	"ssp6_fs",		Standard
	"ssp6_rxd",		Standard
	"ssp6_txd",		Standard
	"stat_1",		Standard
	"stat_2",		Standard
	"sysclken",		Standard
	"traceclk",		Standard
	"tracedt00",		Standard
	"tracedt01",		Standard
	"tracedt02",		Standard
	"tracedt03",		Standard
	"tracedt04",		Standard
	"tracedt05",		Standard
	"tracedt06",		Standard
	"tracedt07",		Standard
	"tracedt08",		Standard
	"tracedt09",		Standard
	"tracedt10",		Standard
	"tracedt11",		Standard
	"tracedt12",		Standard
	"tracedt13",		Standard
	"tracedt14",		Standard
	"tracedt15",		Standard
	"txdata3g0",		Standard
	"txpwrind",		Standard
	"uartb1_ucts",		Standard
	"uartb1_urts",		Standard
	"uartb1_urxd",		Standard
	"uartb1_utxd",		Standard
	"uartb2_urxd",		Standard
	"uartb2_utxd",		Standard
	"uartb3_ucts",		Standard
	"uartb3_urts",		Standard
	"uartb3_urxd",		Standard
	"uartb3_utxd",		Standard
	"uartb4_ucts",		Standard
	"uartb4_urts",		Standard
	"uartb4_urxd",		Standard
	"uartb4_utxd",		Standard
	"vc_cam1_scl",		I2C
	"vc_cam1_sda",		I2C
	"vc_cam2_scl",		I2C
	"vc_cam2_sda",		I2C
	"vc_cam3_scl",		I2C
	"vc_cam3_sda",		I2C