Documentation/devicetree/bindings/amlogic/smartcard-sc2.txt

Device-Tree bindings for smartcard driver

Required properties:
- compatible: Must be "amlogic,smartcard-sc2".
- 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";
		dev_name = "smartcard";
		status = "okay";

		reg = <0x0 0xfe000000 0x0 0x480000>;
		irq_trigger_type = "GPIO_IRQ_LOW";

		reset_pin-gpios = <&gpio GPIOC_3 GPIO_ACTIVE_HIGH>;
		detect_pin-gpios = <&gpio GPIOC_2 GPIO_ACTIVE_HIGH>;
		enable_5v3v_pin-gpios = <&gpio GPIOC_4 GPIO_ACTIVE_HIGH>;
		enable_pin-gpios = <&gpio GPIOC_1 GPIO_ACTIVE_HIGH>;

		interrupts = <0 37 1>;
		interrupt-names = "smc0_irq";
		/*
		 *Smc clock source, if change this,
		 *you must adjust clk and divider in smartcard.c
		 */
		smc0_clock_source = <0>;
		smc0_irq = <37>;		//smc irq
		/*0: high voltage on detect pin indicates card in.*/
		smc0_det_invert = <0>;
		smc0_5v3v_level = <0>;
		/*Ordinarily,smartcard controller needs a enable pin.*/
		smc_need_enable_pin = "yes";
		reset_level = <0>;
		smc0_enable_level = <0>;

		pinctrl-names = "default";
		pinctrl-0 = <&sd_iso7816_pins>;
		clocks = <&clkc CLKID_SC_CLK_GATE>;
		clock-names = "smartcard";
	};