Allwinner A64: Issue on external rtc clock to wifi chip

Maxime Ripard
2018-05-14T08:27:45Z

On Mon, May 14, 2018 at 01:34:56PM +0530, Jagan Teki wrote:
> On Mon, May 14, 2018 at 1:27 PM, Maxime Ripard
> <maxime.ripard@bootlin.com> wrote:
> > Hi,
> >
> > On Mon, May 14, 2018 at 12:37:49PM +0530, Jagan Teki wrote:
> >> 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/
> >
> > Could you paste your config and the logs from a boot to?
>
> .config
> https://paste.ubuntu.com/p/w9w2KB7RFc/
>
> dmesg
> https://paste.ubuntu.com/p/mrZGk5bWRR/

This is kind of weird. Have you tested with a 4.17 kernel? We have
runtime_pm changes lined up in next, so that might be a regression
there, even though we tested it with Quentin at some point.

Maxime

--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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