i.MX ProcessorsのトピックRe: imx6solo SDIO 3.0 config

imx6solo SDIO 3.0 config

garyyin — Tue, 09 Aug 2016 09:26:36 GMT

env: i.mx6solo, linux 3.10.45

Does imx6solo sdio port support sdio 3.0?

If support, should I only config "1-8-v" in device tree's sdhc node?

of course, SDIO device should support sdio 3.0 spec and use 1.8v power supply.

igorpadykov — Tue, 09 Aug 2016 10:53:33 GMT

Hi Gary

i.MX6S supports sdio 3.0, I believe you are right with second too, just for reference one can look at uSDHC2, Broadcom

Best regards

igor

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garyyin — Wed, 10 Aug 2016 02:50:40 GMT

I am just debuging a broadcom wifi-bt module, ref your link, my usdhc node is:

&usdhc1 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_usdhc1_1>;

bus-width = <4>;

non-removable;

vmmc-supply = <&wlreg_on>;

vqmmc-1-8-v;

keep-power-in-suspend;

status = "okay";

};

when linux bootup, I see:

mmc0: no vqmmc regulator found

when I load the module driver, I see following twice:

sdhci-esdhc-imx 2190000.usdhc: could not set regulator OCR (-22)

igorpadykov — Wed, 10 Aug 2016 05:13:24 GMT

had you connected that broadcom wifi-bt module to sd port ?

garyyin — Wed, 10 Aug 2016 07:19:10 GMT

Of course, it's connected. The driver loaded successfully.

garyyin — Wed, 10 Aug 2016 08:12:05 GMT

now, the main problem is the bootup message:

mmc0: no vqmmc regulator found

the message "sdhci-esdhc-imx 2190000.usdhc: could not set regulator OCR (-22)" disappared after I add attribute:

regulator-min-microvolt = <3300000>;

regulator-max-microvolt = <3300000>;

to the 'wlreg_on' device node.

I am not sure if the module port works in sdio 3.0 mode.