linux-kernel - Re: [PATCH 5/6] arm64: dts: Add ipq6018 SoC and CP01 board support

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Date:   Mon, 10 Jun 2019 15:39:56 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Christian Lamparter <chunkeey@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>, agross@...nel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-clk@...r.kernel.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Павел <be.dissent@...il.com>
Subject: Re: [PATCH 5/6] arm64: dts: Add ipq6018 SoC and CP01 board support

Hi Christian,

On 6/6/2019 2:11 AM, Christian Lamparter wrote:
> On Wed, Jun 5, 2019 at 7:16 PM Sricharan R <sricharan@...eaurora.org> wrote:
>>
>> Add initial device tree support for the Qualcomm IPQ6018 SoC and
>> CP01 evaluation board.
>>
>> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
>> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>>
>> +       clocks {
>> +               sleep_clk: sleep_clk {
>> +                       compatible = "fixed-clock";
>> +                       clock-frequency = <32000>;
>> +                       #clock-cells = <0>;
>> +               };
>> +
> Recently-ish, we ran into an issue with the clock-frequency of the sleep_clk
> on older IPQ40XX (and IPQ806x) on the OpenWrt Github and ML.
> From what I know, the external "32KHz" crystals have 32768 Hz, but the QSDK
> declares them at 32000 Hz. Since you probably have access to the BOM and
> datasheets. Can you please confirm what's the real clock frequency for
> the IPQ6018.
> (And maybe also for the sleep_clk of the IPQ4018 as well?).
> 

What exactly is the issue that you faced ?
Looking in to the docs, it is <32000> only on ipq6018 and ipq40xx as well.

Regards,
 Sricharan

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