* WiFi card through sdio interface in kernel 3.10.17
@ 2014-07-01 13:27 jags gediya
0 siblings, 0 replies; only message in thread
From: jags gediya @ 2014-07-01 13:27 UTC (permalink / raw)
To: linux-mmc; +Cc: linux-kernel
Hi all,
I am using linux kernel 3.10.17. I have interfaced wifi module from
TI to sdio interface.
I am getting following error in kernel logs
mmc0: Switching to 3.3V signaling voltage failed
i have done following configuration in device tree.
reg_3p3v: 3p3v {
compatible = "regulator-fixed";
regulator-name = "3P3V";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
};
wilink_wl_en: tiwi_wlan {
compatible = "regulator-fixed";
regulator-name = "wilink_wl_en";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
gpio = <&gpio1 12 0>;
startup-delay-us = <70000>;
enable-active-high;
};
and for usdhc1,
&usdhc1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usdhc1_1>;
bus-width = <4>;
non-removable;
vmmc-supply = <®_3p3v>;
vqmmc-supply = <&wilink_wl_en>;
ocr-limit = <0x80>;
power-off-card;
keep-power-in-suspend;
status = "okay";
};
What can be the reason of error
mmc0: Switching to 3.3V signaling voltage failed?
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2014-07-01 13:27 WiFi card through sdio interface in kernel 3.10.17 jags gediya
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