Part Number: AM3358
We have a AM3358 board up and running in our custom board which has a SiLabs WFM200 WiFi module connected via SDIO. I am having trouble getting the module detected as an hsmmc device on MMC2. The device tree I'm using is as follows:
&am33xx_pinmux {
wifi_pins: wifi_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x88c, PIN_INPUT_PULLUP | MUX_MODE3) /* (V12) gpmc_clk.mmc2_clk */
AM33XX_IOPAD(0x888, PIN_INPUT_PULLUP | MUX_MODE3) /* (T13) gpmc_csn3.mmc2_cmd */
AM33XX_IOPAD(0x844, PIN_INPUT_PULLUP | MUX_MODE3) /* (V14) gpmc_a1.mmc2_dat0 */
AM33XX_IOPAD(0x848, PIN_INPUT_PULLUP | MUX_MODE3) /* (U14) gpmc_a2.mmc2_dat1 */
AM33XX_IOPAD(0x84c, PIN_INPUT_PULLUP | MUX_MODE3) /* (T14) gpmc_a3.mmc2_dat2 */
AM33XX_IOPAD(0x878, PIN_INPUT_PULLUP | MUX_MODE3) /* (U18) gpmc_be1n.mmc2_dat3 */
>;
};
};
&mmc3 {
/* these are on the crossbar and are outlined in the
xbar-event-map element */
dmas = <&edma_xbar 12 0 1
&edma_xbar 13 0 2>;
dma-names = "tx", "rx";
status = "okay";
vmmc-supply = <&vmmcsd_fixed>;
bus-width = <1>;
pinctrl-names = "default";
pinctrl-0 = <&wifi_pins>;
non-removable;
cap-power-off-card;
keep-power-in-suspend;
};
I get
omap_hsmmc 47810000.mmc: no support for card's volts
omap_hsmmc 47810000.mmc: no support for card's volts
mmc1: error -22 whilst initialising MMC card
on the dmesg log if i try to unbind and bind the device using
echo 47810000.mmc > /sys/bus/platform/drivers/omap_hsmmc/unbind
and
echo 47810000.mmc > /sys/bus/platform/drivers/omap_hsmmc/bind
Just for comparison I tried with the Rapsberry Pi3 with SiLabs Raspbian OS image and the module got detected out of the box. However I put a scope on the CMD line (at the instant I issue the bind command above) on the Pi3 and the AM335x on our board and found that the waveforms are different.
Any pointers in this regard would be greatly appreciated!
Thanks in advance
Aka
