linux-kernel - Re: [PATCH 1/3] ASoC: jack: Add a jack detect callback via codec

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Message-ID: <CAEUnVG6FWM5ud8FH7FyhNTSxOYg8GM_eeyUX7ynrSRC6uhOePg@mail.gmail.com>
Date:	Mon, 18 Apr 2016 09:40:50 -0700
From:	Dylan Reid <dgreid@...omium.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Xing Zheng <zhengxing@...k-chips.com>,
	linux-rockchip@...ts.infradead.org,
	Heiko Stübner <heiko@...ech.de>,
	Adam.Thomson@...semi.com, sugar.zhang@...k-chips.com,
	Xu Jianqun <jay.xu@...k-chips.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ASoC: jack: Add a jack detect callback via codec

On Mon, Apr 18, 2016 at 4:46 AM, Mark Brown <broonie@...nel.org> wrote:
> On Mon, Apr 18, 2016 at 06:20:00PM +0800, Xing Zheng wrote:
>> On 2016年04月18日 18:03, Xing Zheng wrote:
>
>> sound {
>>         ......
>>         simple-audio-card,dai-link@0 {
>>             format = "i2s";
>>             cpu {
>>                 sound-dai = <&i2s0>;
>>             };
>>
>>             codec {
>>                 sound-dai = <&codec>;
>>
>>                 simple-audio-card,codec-jack =
>>                     "JACK_HEADSET",
>>                     "JACK_BTN_0",
>>                     "JACK_BTN_1",
>>                     "JACK_BTN_2",
>>                     "JACK_BTN_3";
>>             };
>>         };
>
> This seems like it's only half the job and worryingly close to Linux
> internals.  In particular the fact that the binding is specific to
> simple-card and the fact that it's being placed on the CODEC (rather
> than a separate object that the CODEC references) so that we can't
> combine multiple devices are both a concern.
>
> Dylan Reid did have an earlier go at defining a binding for this:
>
>   http://thread.gmane.org/gmane.linux.alsa.devel/138906
>
> which went through a couple more iterations but the work on that seemed
> to die off a bit.

Thanks for forwarding this.  I did intend to get back to that.  But,
almost a year later, obviously I haven't.

Xing if you want to pick this up it would be great.  Lars had some
good points on that original discussion, which I think we can
integrate into a single solution.