linux-kernel - Re: [PATCH v2 8/8] ASoC: qcom: apq8096: add kcontrols to set PCM rate

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Date:   Mon, 10 Feb 2020 12:13:45 -0500
From:   Adam Serbinski <adam@...binski.com>
To:     Jaroslav Kysela <perex@...ex.cz>
Cc:     Mark Brown <broonie@...nel.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Patrick Lai <plai@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/8] ASoC: qcom: apq8096: add kcontrols to set PCM rate

On 2020-02-10 11:18, Jaroslav Kysela wrote:
> Dne 09. 02. 20 v 16:47 Adam Serbinski napsal(a):
>> This makes it possible for the backend sample rate to be
>> set to 8000 or 16000 Hz, depending on the needs of the HFP
>> call being set up.
> 
> Two points:
> 
> Why enum? It adds just more code than the integer value handlers.

Because enum allows the potential values to be restricted to a set of 
distinct values rather than a range. And while yes, I understand that 
the value can be validated, or the step can in this case be set to 
correspond to the difference between the current 2 values, this approach 
would neither make it clear to the user what the permitted values are, 
nor would it scale well once additional values are required.


> Also, this belongs to the PCM interface, so it should be handled with
> SNDRV_CTL_ELEM_IFACE_PCM not mixer.
> 
> The name should be probably "Rate" and assigned to the corresponding 
> PCM device.
> 
> Add this to Documentation/sound/designs/control-names.rst .

Above 3 lines are noted, I will make these changed.