wifi sdio imx6ul problem

vladimirchernin — Mon, 07 May 2018 14:47:38 GMT

Hi!

We have our custom board with QCA9377 wifi chipset based on imx6ull evk

the chip connected via SDIO on board

below its device tree

&usdhc2 {
label = "MMC1";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usdhc2 &pinctrl_wifi>;
cd-gpios = <&gpio1 19 GPIO_ACTIVE_LOW>;
no-1-8-v;
vmmc-supply = <&reg_sd2_vmmc>;
bus-width = <4>;
non-removable;
status = "okay";

};

pinctrl_usdhc2: usdhc2grp {
fsl,pins = <
MX6UL_PAD_LCD_DATA18__USDHC2_CMD 0x17059
MX6UL_PAD_LCD_DATA19__USDHC2_CLK 0x17059
MX6UL_PAD_LCD_DATA20__USDHC2_DATA0 0x17059
MX6UL_PAD_LCD_DATA21__USDHC2_DATA1 0x17059
MX6UL_PAD_LCD_DATA22__USDHC2_DATA2 0x17059
MX6UL_PAD_LCD_DATA23__USDHC2_DATA3 0x17059
//MX6UL_PAD_UART1_RTS_B__USDHC2_CD_B 0x17059
>;
};

And problem chip is not power up during Linux boot

on the board there is pin MX6UL_PAD_UAuRT1_RTS_B__GPIO1_IO19

its SD card select and there is pull up resistor on the pin.

if we remove pull up resistor udev recognizes the chip driver load the firmware and everything

works

the pin MX6UL_PAD_UART1_RTS_B__GPIO1_IO19 is not used by software

Please help us to understand the problem?

Regards

Vladimir Chernin

Re: wifi sdio imx6ul problem

fabio_estevam — Mon, 07 May 2018 20:53:10 GMT

You should remove the "cd-gpios" property from your device tree.

cd-gpios is for card detection on SD cards. eMMC does not use card detection and you already pass "non-removable;".

Re: wifi sdio imx6ul problem

igorpadykov — Tue, 08 May 2018 02:45:36 GMT

Hi Vladimir

card detection properties are described in attached Linux Manual

sect.32.2.3 Devicetree Binding

Best regards
igor

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wifi sdio imx6ul problem

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Re: wifi sdio imx6ul problem