NVCC_SD1 is driven by a selector which chooses between 3.3V and 1.8. Currently, this is pulled down by a 10k resistor, but occasionally, voltage spikes on this rail cause the regulator to jump between 1.8 and 3.3V.
This patch explicitly sets GPIO_19 to choose the 3.3V rail by forcing this IO pin low to stabilize NVCC_SD1. Signed-off-by: Adam Ford <[email protected]> diff --git a/arch/arm/boot/dts/imx6-logicpd-som.dtsi b/arch/arm/boot/dts/imx6-logicpd-som.dtsi index 547fb141ec0c..233762acbaaf 100644 --- a/arch/arm/boot/dts/imx6-logicpd-som.dtsi +++ b/arch/arm/boot/dts/imx6-logicpd-som.dtsi @@ -15,6 +15,18 @@ reg = <0x10000000 0x80000000>; }; + reg_sdhc1: regulator-sdhc1 { + compatible = "regulator-fixed"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_reg_sdhc1>; + regulator-name = "reg_sdhc1"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + gpio = <&gpio4 5 GPIO_ACTIVE_LOW>; + startup-delay-us = <70000>; + enable-active-high; + }; + reg_wl18xx_vmmc: regulator-wl18xx { compatible = "regulator-fixed"; regulator-name = "vwl1837"; @@ -267,6 +279,12 @@ >; }; + pinctrl_reg_sdhc1: regsdhc1grp { + fsl,pins = < + MX6QDL_PAD_GPIO_19__GPIO4_IO05 0x1b0b0 + >; + }; + pinctrl_tempsense: tempsensegrp { fsl,pins = < MX6QDL_PAD_NANDF_CS2__GPIO6_IO15 0x1b0b0 @@ -343,7 +361,9 @@ non-removable; keep-power-in-suspend; wakeup-source; + no-1-8-v; vmmc-supply = <&sw2_reg>; + vqmmc-supply = <®_sdhc1>; status = "okay"; }; -- 2.17.1
