linux-kernel - Re: Allwinner A64: Issue on external rtc clock to wifi chip

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Date:   Mon, 14 May 2018 09:57:27 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: Allwinner A64: Issue on external rtc clock to wifi chip

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@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?

Thanks!
Maxime

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

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