linux-kernel - Re: [PATCH 2/2] irqchip: irq-qcom-mpm: Support passing a slice of SRAM as reg space

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Message-ID: <2fbb605a-8ec4-3cd0-3200-5997149bf478@linaro.org>
Date:   Thu, 30 Mar 2023 13:17:28 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Shawn Guo <shawn.guo@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] irqchip: irq-qcom-mpm: Support passing a slice of
 SRAM as reg space



On 30.03.2023 03:50, Shawn Guo wrote:
> On Wed, Mar 29, 2023 at 03:30:12PM +0200, Konrad Dybcio wrote:
>>> Otherwise, I do not understand why devm_ioremap_resource() cannot be
>>> used.
>> drivers/rpmsg/qcom_glink_rpm.c calls devm_ioremap on the entire
>> RPM MSG RAM.
> 
> qcom_glink_rpm driver remaps the entire RPM MSG RAM, but it doesn't seem
> to request any region.  So MPM can still call devm_ioremap_resource() on
> its slice, no?
FWIW, I did get a 'can't request resource error'.

Konrad
> 
> Shawn