linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq8074: fix the sleep clock frequency

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Date:   Fri, 25 Feb 2022 17:48:51 +0530
From:   Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     <agross@...nel.org>, <robh+dt@...nel.org>, <varada@...eaurora.org>,
        <mraghava@...eaurora.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>, <quic_srichara@...cinc.com>
Subject: Re: [PATCH] arm64: dts: qcom: ipq8074: fix the sleep clock frequency


On 2/25/2022 1:27 AM, Bjorn Andersson wrote:
> On Fri 11 Feb 06:14 CST 2022, Kathiravan T wrote:
>
>> Sleep clock frequency should be 32768Hz. Lets fix it.
>>
>> Cc: stable@...r.kernel.org
>> Fixes: 41dac73e243d ("arm64: dts: Add ipq8074 SoC and HK01 board support")
>> Link: https://lore.kernel.org/all/e2a447f8-6024-0369-f698-2027b6edcf9e@codeaurora.org/
>> Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
> Can you please confirm this? The documentation for GCC says that the
> incoming sleep clock is 32000Hz.
>
> Regards,
> Bjorn

Bjorn,

I checked the internal documents and it is derived from the PMIC as 
32.7645KHz. I rounded off it to 32768Hz. Looks like GCC documentation is 
not up-to-date.

All these information is available in the link 
https://lore.kernel.org/all/e2a447f8-6024-0369-f698-2027b6edcf9e@codeaurora.org/

Please let me know if you need any further information.

Thanks,

Kathiravan T.

>> ---
>>   arch/arm64/boot/dts/qcom/ipq8074.dtsi | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq8074.dtsi b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
>> index 26ba7ce9222c..b6287355ad08 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq8074.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
>> @@ -13,7 +13,7 @@
>>   	clocks {
>>   		sleep_clk: sleep_clk {
>>   			compatible = "fixed-clock";
>> -			clock-frequency = <32000>;
>> +			clock-frequency = <32768>;
>>   			#clock-cells = <0>;
>>   		};
>>   
>> -- 
>> 2.7.4
>>