Overview

The aim of this document is to explain how to setup pins of SP7350 in device-tree source. SP7350 has 106 general purpose IO (GPIO) pins which are multiplexed with other special functions, like eMMC device, SPI-NOR flash, SPI-NAND flash, Ethernet PHY (RGMII or RMII interface), UART, I2C pins, and etc.

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SP7350 has 106 GPIO pins. ID is from 0 to 105. Name is in form of GPIO(id), like GPIO0, GPIO1, GPIO2, GPIO99, GPIO105, and etc. There are two kinds of GPIO pins. One is 1.8V GPIO pins, and the other is 1.8V/3.0V Dual Voltage IO (DVIO) pins. Beside configure 1.8V or 3.0V power to power supply of a DVIO group in your circuit boards (hardware), you need to setup Voltage Mode Select (MS control) in device-tree source. Refer to groups of GPIO and DVIO in appendix GPIO Table below in details.

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Here lists some examples of pin configuration on sp7350-ev.dts:

1. SD card with typical drive source current 17.7mA (Min: 6.5mA, Max: 34.6mA) for DVIO.

See Appendix/drive_strength_table below.

sdcard_pins: pinmux_sdcard-pins {
    function = "SD_CARD";
    groups = "SD_CARD";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_17700_IOL_21800UA>;
};

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2. SDIO with typical drive source current 17.7mA (Min: 6.5mA, Max: 34.6mA) for DVIO.

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2. .

sdio_pins: pinmux_sdio-pins {
    function = "SDIO";
    groups = "SDIO";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_17700_IOL_21800UA>;
};

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• TXD0(GPIO7), TXD1(GPIO8), TXC(GPIO10), TXEN(GPIO11), TXD2(GPIO15), TXD3(GPIO16) with typical drive source current 16.4mA (Min: 11.3mA, Max: 21.6mA) for GPIO.

• RXC(GPIO3), RXDV(GPIO4), RXD0(GPIO5), RXD1(GPIO6), RXD2(GPIO13), RXD3(GPIO14) with typical drive source current 8.2mA (Min: 5.7mA, Max: 10.8mA) for GPIO.

• MDC(GPIO9), MDIO(GPIO12) with typical drive source current 8.2mA (Min: 5.7mA, Max: 10.8mA) for GPIO.

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• .

gmac_pins: pinmux_gmac-pins {
  	pinmux{
        function = "GMAC";
      	groups = "GMAC_RGMII";
    };
  
    pinconf0 {
        pins = "GPIO7","GPIO8","GPIO10","GPIO11","GPIO15","GPIO16";
        drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_16400_IOL_16500UA>;
    };
    
    pinconf1 {
      	pins = "GPIO3","GPIO4","GPIO5","GPIO6","GPIO13","GPIO14";
        drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_8200_IOL_8300UA>;
    };
  
    pinconf3 {
      	pins = "GPIO9","GPIO12";
        drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_8200_IOL_8300UA>;
    };
};

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4. eMMC with typical drive source current 17.7mA (Min: 6.5mA, Max: 34.6mA) for DVIO.

See Appendix/drive_strength_table below.

emmc_pins: pinmux_emmc-pins {
    function = "EMMC";
    groups = "EMMC";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_17700_IOL_21800UA>;
};

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5. I2C0 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

See Appendix/drive_strength_table below.

i2c_combo0_pins: pinmux_i2c_combo0-pins {
    function = "I2C_COMBO0";
    groups = "I2C_COMBO0_X1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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6. I2C1 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

See Appendix/drive_strength_table below.

i2c_combo1_pins: pinmux_i2c_combo1-pins {
    function = "I2C_COMBO1";
    groups = "I2C_COMBO1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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7. I2C2 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

See Appendix/drive_strength_table below.

i2c_combo2_pins: pinmux_i2c_combo2-pins {
    function = "I2C_COMBO2";
    groups = "I2C_COMBO2_X1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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8. I2C3 with typical drive source current 9.9mA (Min: 6.8mA, Max: 13.0mA) for GPIO.

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8. .

i2c_combo3_pins: pinmux_i2c_combo3-pins {
    function = "I2C_COMBO3";
    groups = "I2C_COMBO3";
    drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_9900_IOL_9900UA>;
};

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9. I2C6 with typical drive source current 16.4mA (Min: 11.3mA, Max: 21.6mA)for GPIO.

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9. .

i2c_combo6_pins: pinmux_i2c_combo6-pins {
    function = "I2C_COMBO6";
    groups = "I2C_COMBO6_X1";
    drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_16400_IOL_16500UA>;
};

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10. I2C7 with typical drive source current 9.9mA (Min: 6.8mA, Max: 13.0mA) for GPIO.

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10. .

i2c_combo7_pins: pinmux_i2c_combo7-pins {
    function = "I2C_COMBO7";
    groups = "I2C_COMBO7_X1";
    drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_9900_IOL_9900UA>;
};

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11. UART0 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

See Appendix/drive_strength_table below.

uart0_pins: pinmux_uart0-pins {
    function = "UART0";
    groups = "UART0_X1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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12. UART1 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

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12. .

uart1_pins: pinmux_uart1-pins {
    function = "UART1";
    groups = "UART1_X1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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13. UART2 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

See Appendix/drive_strength_table below.

uart2_pins: pinmux_uart2-pins {
    function = "UART2";
    groups = "UART2_X1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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14. UART3 with typical drive source current 15.2mA (Min: 5.6mA, Max: 29.7mA) for DVIO.

See Appendix/drive_strength_table below.

uart3_pins: pinmux_uart3-pins {
    function = "UART3";
    groups = "UART3_X1";
    drive-strength-microamp = <SPPCTRL_DVIO_DRV_IOH_15200_IOL_18700UA>;
};

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15. UADBG with typical drive source current 6.6mA (Min: 4.5mA, Max: 8.6mA) for GPIO.

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15. .

uadbg_pins: pinmux_uadbg-pins {
    function = "UADBG";
    groups = "UADBG";
    drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_6600_IOL_6600UA>;
};

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16. UART6 with typical drive source current 6.6mA (Min: 4.5mA, Max: 8.6mA) for GPIO.

See Appendix/drive_strength_table below.

uart6_pins: pinmux_uart6-pins {
    function = "UART6";
    groups = "UART6_X1";
    drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_6600_IOL_6600UA>;
};

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17. UART7 with typical drive source current 6.6mA (Min: 4.5mA, Max: 8.6mA) for GPIO.

See Appendix/drive_strength_table below.

uart7_pins: pinmux_uart7-pins {
    function = "UART7";
    groups = "UART7";
    drive-strength-microamp = <SPPCTRL_GPIO_DRV_IOH_6600_IOL_6600UA>;
};

Refer to Driving-strength Table of GPIO and Driving-strength Table of DVIO in Appendix.

Appendix

List of support properties

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