Allwinner A64: Issue on external rtc clock to wifi chip

Jagan Teki
2018-05-14T07:07:49Z

Hi Maxime and All,

We are trying to bring-up AP6330 Wifi chip for A64 board. We noticed
to have an external rtc clock has driven from wifi chip.

So the devicetree is configured according to this as below.

/ {
wifi_pwrseq: wifi-pwrseq {
compatible = "mmc-pwrseq-simple";
clocks = <&rtc 1>;
clock-names = "ext_clock";
reset-gpios = <&r_pio 0 2 GPIO_ACTIVE_LOW>; /* PL2 */
post-power-on-delay-ms = <400>;
};
};

&rtc {
clock-output-names = "rtc-osc32k", "rtc-osc32k-out";
clocks = <&osc32k>;
#clock-cells = <1>;
};

&mmc1 {
pinctrl-names = "default";
pinctrl-0 = <&mmc1_pins>;
vmmc-supply = <&reg_dcdc1>;
vqmmc-supply = <&reg_eldo1>;
mmc-pwrseq = <&wifi_pwrseq>;
bus-width = <4>;
non-removable;
status = "okay";

brcmf: wifi at 1 {
reg = <1>;
compatible = "brcm,bcm4329-fmac";
interrupt-parent = <&r_pio>;
interrupts = <0 3 IRQ_TYPE_LEVEL_LOW>; /* WL-WAKE-AP: PL3 */
interrupt-names = "host-wake";
};
};

And observed rtc-osc32k-out clock is never enabled[1] and the value of
LOSC_OUT_GATING is 0x0 which eventually not enabling
LOSC_OUT_GATING_EN

Pls. let us know if we miss anything here?

[1] https://paste.ubuntu.com/p/X2By4q8kD2/

Jagan.

--
Jagan Teki
Senior Linux Kernel Engineer | Amarula Solutions
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.