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DRA821A: Pinmux tool usage to support PU and PD for MMC0 IF

John H. Gardner
Guru 51711 points

Part Number: DRA821A

Our customer is using the pinmux tool for the DRA821.   From an early table associated with the MMC0 IF it shows the possibility of configuring the pullups and pulldowns but the pin mux tool does not support this feature.   How can these pullups and pull downs be activated?

  • 0
    TI__Guru**** 162810 points

    Hi John,

    I checked the sysconfig tool output for MMC1:

    &main_pmx0 {
    mymmcsd1_pins_default: mymmcsd1_pins_default {
    pinctrl-single,pins = <
    J721E_IOPAD(0x254, PIN_INPUT, 0) /* (R29) MMC1_CMD */
    J721E_IOPAD(0x250, PIN_INPUT, 0) /* (P25) MMC1_CLK */
    J721E_IOPAD(0x2ac, PIN_INPUT, 0) /* (P25) MMC1_CLKLB */
    J721E_IOPAD(0x24c, PIN_INPUT, 0) /* (R24) MMC1_DAT0 */
    J721E_IOPAD(0x248, PIN_INPUT, 0) /* (P24) MMC1_DAT1 */
    J721E_IOPAD(0x244, PIN_INPUT, 0) /* (R25) MMC1_DAT2 */
    J721E_IOPAD(0x240, PIN_INPUT, 0) /* (R26) MMC1_DAT3 */
    J721E_IOPAD(0x258, PIN_INPUT, 0) /* (P23) MMC1_SDCD */
    J721E_IOPAD(0x25c, PIN_INPUT, 0) /* (R28) MMC1_SDWP */
    >;
    };

    };

    Bit16-- PULLTYPESEL -> 0h - Pullup / Pulldown enabled
    Bit17-- PULLTYPESEL -- 0h - Pulldown selected & 1h - Pullup selected

    So i both Bits 16/17 are 0s then pull down is selected.

    There is no mention of PULL_UP or PULL_DOWN is that the issue being highlighted by the customer?
    I just want to understand the question better.

    Best Regards,
    Keerthy