linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: ipq8074: add QFPROM node

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Date:   Mon, 23 Jan 2023 10:46:47 +0100
From:   Robert Marko <robimarko@...il.com>
To:     Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        srinivas.kandagatla@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: ipq8074: add QFPROM node

On Mon, 23 Jan 2023 at 05:44, Kathiravan Thirumoorthy
<quic_kathirav@...cinc.com> wrote:
>
>
> On 1/22/2023 10:39 PM, Robert Marko wrote:
> > On Sun, 22 Jan 2023 at 18:05, Kathiravan Thirumoorthy
> > <quic_kathirav@...cinc.com> wrote:
> >>
> >> On 1/22/2023 10:29 PM, Robert Marko wrote:
> >>> On Sun, 22 Jan 2023 at 17:57, Kathiravan Thirumoorthy
> >>> <quic_kathirav@...cinc.com> wrote:
> >>>> On 1/21/2023 4:53 PM, Robert Marko wrote:
> >>>>> IPQ8074 has efuses like other Qualcomm SoC-s that are required for
> >>>>> determining various HW quirks which will be required later for CPR etc,
> >>>>> so lets add the QFPROM node for start.
> >>>>>
> >>>>> Individidual fuses will be added as they are required.
> >>>>>
> >>>>> Signed-off-by: Robert Marko <robimarko@...il.com>
> >>>>> ---
> >>>>>     arch/arm64/boot/dts/qcom/ipq8074.dtsi | 7 +++++++
> >>>>>     1 file changed, 7 insertions(+)
> >>>>>
> >>>>> diff --git a/arch/arm64/boot/dts/qcom/ipq8074.dtsi b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> >>>>> index 8eba586065a3..f29491f647fe 100644
> >>>>> --- a/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> >>>>> +++ b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> >>>>> @@ -301,6 +301,13 @@ mdio: mdio@...00 {
> >>>>>                         status = "disabled";
> >>>>>                 };
> >>>>>
> >>>>> +             qfprom: efuse@...00 {
> >>>>> +                     compatible = "qcom,ipq8074-qfprom", "qcom,qfprom";
> >>>>> +                     reg = <0x000a4000 0x1000>;
> >>>>    From the HW document, I see the overall size of this region is 0x2000,
> >>>> any reason to stick with 0x1000?
> >>> Like always, I dont have access to docs and 0x1000 is all I could find
> >>> downstream
> >>> being used.
> >>>
> >>> Any chance you can share the regions inside of QFPROM, it would be great to use
> >>> the ECC corrected one if available.
> >> Sorry, What do you refer by "ECC corrected" here?
> > Isnt there a corrected region in the QFPROM meant for reading?
> > As far as I understand it's protected by FEC.
>
>
> Yes, there are two regions for the QFPROM, the region which you used
> here is the one used for reading and there is a error correction logic
> for it and it is size is 8KB not 4KB.

Ok, thanks for the info, I will expand the size to 0x2000 then in v2.

Regards,
Robert
>
> Thanks, Kathiravan T.
>
> >
> > Regards,
> > Robert
> >> Thanks, Kathiravan T.
> >>
> >>
> >>> Regards,
> >>> Robert
> >>>> Thanks, Kathiravan T.
> >>>>
> >>>>
> >>>>> +                     #address-cells = <1>;
> >>>>> +                     #size-cells = <1>;
> >>>>> +             };
> >>>>> +
> >>>>>                 prng: rng@...00 {
> >>>>>                         compatible = "qcom,prng-ee";
> >>>>>                         reg = <0x000e3000 0x1000>;