AM5728: SPI hangs in reset in U-boot

I want to communicate with SPI devices in uboot, but SPI is dead-loop in spi_reset of the omap3_spi.c.
The MCSPI_SYSSTATUS register of SPI is always 0, indicating Internal module reset is ongoing.

My changes are as follows:

(1)dra7.dtsi:

    aliases {

                spi0 = &qspi;

++spi1 = &mcspi1;

++spi2 = &mcspi2;

++spi3 = &mcspi3;

++spi4 = &mcspi4;

    }

(2)am57xx-beagle-x15-common.dtsi add:

    &mcspi2 {

     status = "okay";

     ti,pindir-d0-out-d1-in;

     sn65hvs882: sn65hvs882@0 {

     compatible = "pisosr-gpio";

     gpio-controller;

     #gpio-cells = <2>;

     reg = <0>;

     spi-max-frequency = <1000000>;

     spi-cpol;

     };

    };

(3) u-boot-2018.01/board/ti/am57xx/mux_data.h

    const struct pad_conf_entry core_padconf_array_essential_x15[] = {

        {SPI2_SCLK, (M0 | PIN_INPUT_PULLDOWN)},

{SPI2_D1, (M0 | PIN_INPUT_PULLDOWN)},

{SPI2_D0, (M0 | PIN_INPUT_PULLDOWN)},

{SPI2_CS0, (M0 | PIN_OUTPUT_PULLUP)},

    }

After compiling, put the u-boot.img amd MLO into emmc and start it.

Execute the sspi 2:0 8 command under uboot.Will loop endlessly in spi_reset in omap3_spi.c.

The spi_reset function will reset the spi and query the state, but the state is always 0. In the manual, a state of 0 means that the reset is ongoing.

static void spi_reset(struct mcspi *regs)

{

unsigned int tmp;

writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &regs->sysconfig);

do {

tmp = readl(&regs->sysstatus);

} while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));

writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |

       OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |

       OMAP3_MCSPI_SYSCONFIG_SMARTIDLE, &regs->sysconfig);

writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &regs->wakeupenable);

}

I'd like to ask where the question might appear.