linux-kernel - Re: [Patch v7 1/4] memory: tegra: Add memory controller channels support

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Message-ID: <aa8ff319-d80a-6810-ecd1-dcc9b64143db@nvidia.com>
Date:   Thu, 14 Apr 2022 11:05:16 +0530
From:   Ashish Mhetre <amhetre@...dia.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>, digetx@...il.com,
        krzysztof.kozlowski@...aro.org, thierry.reding@...il.com,
        jonathanh@...dia.com, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     vdumpa@...dia.com, Snikam@...dia.com
Subject: Re: [Patch v7 1/4] memory: tegra: Add memory controller channels
 support



On 4/14/2022 2:47 AM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
> 
> 
> On 4/13/22 12:40, Ashish Mhetre wrote:
>> +static int tegra186_mc_map_regs(struct tegra_mc *mc)
>> +{
>> +     struct platform_device *pdev = to_platform_device(mc->dev);
>> +     int i;
>> +
>> +     mc->bcast_ch_regs = devm_platform_ioremap_resource_byname(pdev, "broadcast");
>> +     if (IS_ERR(mc->bcast_ch_regs)) {
>> +             if (PTR_ERR(mc->bcast_ch_regs) == -EINVAL) {
>> +                     dev_warn(&pdev->dev, "Broadcast channel is missing, please update your device-tree\n");
> 
> Set mc->bcast_ch_regs=NULL on error.

It's not really necessary. If mc->bcast_ch_regs == -EINVAL, then
interrupts won't occur at all. I have added explanation in patch 2.