How to enable SDMMC3 in u-boot on TX2-NX

[yi-chia.lan]

Hi All,

We has customize carrier board with SD slot, and we would like to enable SD function in u-boot.

add settings into dts as fellow:

sdhci@3440000 {
		compatible = "nvidia,tegra186-sdhci";
		reg = <0x0 0x03440000 0x0 0x200>;
		resets = <&bpmp TEGRA186_RESET_SDMMC3>;
		reset-names = "sdhci";
		clocks = <&bpmp TEGRA186_CLK_SDMMC3>;
		interrupts = <GIC_SPI 62 0x04>;

		cd-inverted;
		cd-gpios = <&gpio_main TEGRA_MAIN_GPIO(X, 4) GPIO_ACTIVE_LOW>;
		bus-width = <4>;
		disable-wp;
		status = "okay";
	};

I think pmic setting is needed, but didn’t know how to enable sdmmc3 power.
Any idea???

[WayneWWW]

Hi,

Here is one example from another user who tries to enable this on nano 2gb.

Please make similar change to your TX2-NX.

3433665_fb302d6542_diff (1).txt (9.9 KB)

[yi-chia.lan]

Hi WayneeWWW,

without patch, we enable SDMMC3 function in u-boot on nano-4g works fine,
only need to add sdhci@700b0400 in devicetree and turn on pmic power in pin_mux_mmc function
val = 0xF2;
ret = dm_i2c_write(dev, MAX77620_CNFG1_L6_REG, &val, 1);
if (ret) {
printf(“i2c_write 0 0x3c 0x2f failed: %d\n”, ret);
}

With TX2-NX , we also add sdhci into devicetree ,
but I don’t think SDMMC3 use the same LDO6 as nano does.
To measure SDMMC3 bus , there is no voltage on sdio (all at low voltage status).
Do anything missing on porting sdmmc3 on TX2-NX u-boot?

[kayccc]

Sorry for the late response, have you managed to get issue resolved or still need the support? Thanks

[yi-chia.lan]

Hi kayccc,
issue still not resolved. uboot boot sequence can not boot from SD card.

[yi-chia.lan]

Hi kayccc,

Do nvidia has any update ??

[WayneWWW]

Which gpio are you using on your custom board for sdmmc3 3v3?

[yi-chia.lan]

Hi WayneWWW,

sdmmc3 3v3 is system power, didn’t controlled by GPIO.

[kayccc]

Sorry for the late response, is this still an issue to support? Thanks

[yi-chia.lan]

Hi kayccc,
yes, still an issue, need nvidia support.

[WayneWWW]

Hi,

For TX2NX, it is LDO7.