linux-kernel - Re: [PATCH] ASoC: qcom: soundwire: Enable soundwire bus clock for version 1.6

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Message-ID: <f7fbf5e2-2f09-1df5-475a-cfe04f33059a@codeaurora.org>
Date:   Tue, 5 Oct 2021 20:43:11 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        srinivas.kandagatla@...aro.org, rohitkr@...eaurora.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        swboyd@...omium.org, judyhsiao@...omium.org
Cc:     Venkata Prasad Potturu <potturu@...eaurora.org>
Subject: Re: [PATCH] ASoC: qcom: soundwire: Enable soundwire bus clock for
 version 1.6


On 10/5/2021 8:33 PM, Pierre-Louis Bossart wrote:
> Thanks for Your time Bossart!!!
>
>>>> +        ctrl->swrm_hctl_reg = devm_ioremap(&pdev->dev,
>>>> swrm_hctl_reg, 0x4);
>>> if (!ctrl->swrm_hctl_reg)
>>>       return -ENODEV;
>>>
>>> ?
>> I think here error check is not required, as this change is required
>> only for soundwire version 1.6 and above.
> My comment had nothing to do with versions, it's just that ioremap can
> fail and in general it's wise to test for errors...

Okay. My intention is if offset (swrm_hctl_reg) is zero, devm_ioremap 
may return error.

In that case we need to ignore error.

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