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Date:   Wed, 20 May 2020 17:39:18 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rnayak@...eaurora.org, ilina@...eaurora.org, lsrao@...eaurora.org,
        mka@...omium.org, evgreen@...omium.org, dianders@...omium.org,
        Maulik Shah <mkshah@...eaurora.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc7180: Correct the pdc interrupt ranges

Quoting Maulik Shah (2020-05-18 05:20:02)
> Few PDC interrupts do not map to respective parent GIC interrupt.
> Fix this by correcting the pdc interrupt map.
> 
> Fixes: 22f185ee81d2 ("arm64: dts: qcom: sc7180: Add pdc interrupt controller")
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index f1280e0..f6b4ee8 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -2308,8 +2308,7 @@
>                 pdc: interrupt-controller@...0000 {
>                         compatible = "qcom,sc7180-pdc", "qcom,pdc";
>                         reg = <0 0x0b220000 0 0x30000>;
> -                       qcom,pdc-ranges = <0 480 15>, <17 497 98>,
> -                                         <119 634 4>, <124 639 1>;
> +                       qcom,pdc-ranges = <0 480 94>, <94 609 31>, <125 63 1>;

This is a sign that we shouldn't put this information in DT. It was
wrong once so who knows if it will be wrong again. We don't have an
automated way to check this like we can check other properties. And the
information isn't something that is changed by firmware or the OS
loader. It is static data about the internals of the PDC device and how
it maps PDC pins to GIC SPI lines. We are probably better off just
setting up these ranges in the driver vs. relying on DT authors to get
it right.

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