Documentation/devicetree/bindings/amlogic/amlogic-smartcard.txt

Device-Tree bindings for smartcard driver

Required properties:
- compatible: Must be "amlogic, smartcard".
- interrupts: Smartcard IRQ.
- smc0_clock_source: Smartcard module's clock source selection.
- reset_level: Reset level.
- smc0_det_invert: Invert the DET level.
- pinctrl: Pinmux setting of the smartcard.
- resets: Clock domain of the smartcard.

If you want to use GPIO to replace the DET and RESET pins, the following properties should be set:
- reset_pin: RESET GPIO.
- detect_pin: DETECT GPIO.

If you want to switch 5v/3v by a GPIO, the following properties should be set:
- enable_5v3v_pin: 5v/3v switch GPIO.
- smc0_5v3v_level: 5v/3v GPIO output.

If you want to disable the CLK output when no card inserted, the following properties should be set:
- smc0_clk_pinmux_reg: CLK pinmux register address.
- smc0_clk_pinmux_bit: CLK pinmux bit.
- smc0_clk_oen_reg: CLK GPIO OEN register.
- smc0_clk_out_reg: CLK GPIO output register.
- smc0_clk_bit: CLK GPIO bit.
- smc0_clk_oebit: CLK GPIO OEN bit.;
- smc0_clk_oubit: BLK GPIO output bit.

Example:
smartcard {
	compatible = "amlogic,smartcard";
	irq_trigger_type = "GPIO_IRQ_LOW";

	reset_pin = <&gpio GPIOX_11 GPIO_ACTIVE_HIGH >;		//Reset pin
	detect_pin = <&gpio GPIOX_20 GPIO_ACTIVE_HIGH >;	//Detect pin
	enable_5v3v_pin = <&gpio GPIOX_10 GPIO_ACTIVE_HIGH >;	//5V3V pin, can be ignored

	interrupts = <0 69 4>;		//smc irq

	smc0_clock_source = <0>;	//Smc clock source, if change this, you must adjust clk and divider in smartcard.c
	smc0_irq = <69 >;		//smc irq
	smc0_det_invert = <0>;		//0: high voltage on detect pin indicates card in.
	smc0_5v3v_level = <0>;
	smc_need_enable_pin = "no";	//Ordinarily, smartcard controller needs a enable pin.
	reset_level = <0>;		//0: low to reset the smartcard

	smc0_clk_pinmux_reg = <0x30>;
	smc0_clk_pinmux_bit = <0x80>;
	smc0_clk_oen_reg = <0x200f>;
	smc0_clk_out_reg = <0x2010>;
	smc0_clk_bit = <0x2000>;
	smc0_clk_oebit = <0x2000000>;
	smc0_clk_oubit = <0x1000000>;

	pinctrl-names = "default";
	pinctrl-0 = <&smc_pins>;
	resets = <&clock GCLK_IDX_SMART_CARD_MPEG_DOMAIN>;
	reset-names = "smartcard";

	status = "okay";
};

&pinmux {
	smc_pins:smc_pins {	//Set gpio to 7816-clk 7816-data mode.
		amlogic,setmask = <4 0x000000c0>;       //Please refer to core-pin mux document
		amlogic,clrmask = <3 0x60000280>;
		amlogic,pins = "GPIOX_8","GPIOX_9";
	};
}