linux-kernel - Re: [PATCH v2 4/7] arm64: dts: qcom: Add msm8939 SoC

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Date:   Tue, 10 Jan 2023 13:14:22 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        djakov@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        benl@...areup.com, shawn.guo@...aro.org, fabien.parent@...aro.org,
        leo.yan@...aro.org, dmitry.baryshkov@...aro.org,
        Jun Nie <jun.nie@...aro.org>,
        James Willcox <jwillcox@...areup.com>,
        Joseph Gates <jgates@...areup.com>,
        Max Chen <mchen@...areup.com>, Zac Crosby <zac@...areup.com>,
        Vincent Knecht <vincent.knecht@...loo.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: Re: [PATCH v2 4/7] arm64: dts: qcom: Add msm8939 SoC

On 03/01/2023 09:14, Krzysztof Kozlowski wrote:
> ../arch/arm64/boot/dts/qcom/msm8939.dtsi:1825.23-1842.5: Warning
> (simple_bus_reg): /soc@...mc@...4000: simple-bus unit address format
> error, expected "7824900

For the record the driver consuming this dt entry requires the host regs 
to come first followed by the core

sdhc_1: mmc@...4000 {
         compatible = "qcom,msm8916-sdhci", "qcom,sdhci-msm-v4";
         reg = <0x07824900 0x11c>, <0x07824000 0x800>;
         reg-names = "hc", "core";
}

If I change this and the msm8916 to

sdhc_1: mmc@...4000 {
         compatible = "qcom,msm8916-sdhci", "qcom,sdhci-msm-v4";
         reg = <0x07824000 0x800>, <0x07824900 0x11c>;
         reg-names = "core", "hc";
}

the warning goes away but then this code won't work as intended anymore.

drivers/mmc/host/sdhci-msm.c:		msm_host->core_mem = 
devm_platform_ioremap_resource(pdev, 1);

Weirdly when I change the ordering of the registers in the dts the SD 
seems to work just fine, which is at variance to my reading of the code.

Converting the sdhci driver to use the register name, instead of a 
static ordering of the regs feels like something to be done in a 
separate series.

---
bod