linux-kernel - Re: [PATCH v0 2/2] arm64: dts: rockchip: add support for Firefly ROC-RK3399-PC-PLUS

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Date:   Wed, 30 Jun 2021 14:49:40 +0800
From:   Levin <djw@...hip.com.cn>
To:     Heiko Stübner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org
Cc:     Wayne Chou <zxf@...hip.com.cn>, Kongxin Deng <dkx@...hip.com.cn>,
        Chen-Yu Tsai <wens@...e.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Jensen Huang <jensenhuang@...endlyarm.com>,
        Johan Jonker <jbx6244@...il.com>,
        Liang Chen <cl@...k-chips.com>,
        Marty Jones <mj8263788@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v0 2/2] arm64: dts: rockchip: add support for Firefly
 ROC-RK3399-PC-PLUS

Hi Heiko,


Thanks for your reply.


On 2021-06-29 5:32 PM, Heiko Stübner wrote:
> Am Dienstag, 29. Juni 2021, 11:30:10 CEST schrieb Heiko Stübner:
>> Hi Levin,
>>
>> Am Dienstag, 29. Juni 2021, 11:15:59 CEST schrieb Levin:
>>> Hi all, is it possible to turn on some codec mixer switch in the device
>>> tree?
>> I don't think that is appropriate and/or/ possible in the devicetree.
>>
>> Instead I think you want an Alsa UCM profile for it, see:
>> https://github.com/alsa-project/alsa-ucm-conf/tree/master/ucm2/Rockchip
>>

Alsa UCM profile is a complete solution, yet it requires more labor work 
of adding a complex profile with all the controls.


The problem is, music/video player knows nothing of the mixers. And with 
currently codec driver setting, user cannot

hear any sound until he turns on two mixer switch.


I hope to have a "simple-audio-card,switch" property here.


>>>
>>> Currently, to hear to sound, we need to run the following commands from
>>> the user space:
>>>
>>>     # turn on mixer switch
>>>
>>>     amixer -c 1 sset 'Left Mixer' on
>>>     amixer -c 1 sset 'Right Mixer' on
>>>
>>>     # raise volume
>>>
>>>     amixer -c 1 sset 'Output 2' 36
>>>
>>>
>>> If these settings can be embedded into device tree, and set by kernel as
>>> initial ALSA path settings,
>>>
>>> user can hear the sound with zero ALSA config. That'll be great.
>>>
>>>
>>> On 2021-06-28 11:54 AM, djw@...hip.com.cn wrote:
>>>> +
>>>> +	es8388-sound {
>>>> +		compatible = "simple-audio-card";
>>>> +		pinctrl-names = "default";
>>>> +		pinctrl-0 = <&hp_det_pin>;
>>>> +		simple-audio-card,name = "rockchip,es8388-codec";
> and I guess you'd want a more specific name as that config likely is board-specific
> not for all boards using the es8388-codec?
>
>
> Heiko
>

I got what you mean now. It should be renamed to a board-specific card 
name if using Alsa UCM profile, right ?

-- 

Best Regards!

Levin Du