linux-kernel - Re: [PATCH 0/2] rockchip-i2s: add power setting for I2S controller and fix some critical bugs

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Date:	Sat, 30 Aug 2014 20:55:12 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Jianqun <jay.xu@...k-chips.com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>, perex@...ex.cz,
	tiwai@...e.de, yongjun_wei@...ndmicro.com.cn,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org
Subject: Re: [PATCH 0/2] rockchip-i2s: add power setting for I2S controller and fix some critical bugs

Am Freitag, 29. August 2014, 21:30:43 schrieb Doug Anderson:
> Jianqun,
> 
> On Fri, Aug 29, 2014 at 3:07 PM, Jianqun <jay.xu@...k-chips.com> wrote:
> > Add optional power setting for i2s controller found on rk3066, rk3168 and
> > rk3288 processors from rockchip, should according to hardware design.
> > 
> > Default setting for I2S controller is powered by 3.3V, there needs this
> > patch if it's powered by 1.8V by hardware design.
> > 
> > Jianqun (2):
> >   rockchip-i2s: dt: add grf requested properties to set power of I2S
> >   controller rockchip-i2s: add power setting for I2S controller, also fix
> >   some bugs>  
> >  .../devicetree/bindings/sound/rockchip-i2s.txt     |  6 +-
> >  sound/soc/rockchip/rockchip_i2s.c                  | 93
> >  +++++++++++++--------- sound/soc/rockchip/rockchip_i2s.h                
> >   | 13 +--
> >  3 files changed, 68 insertions(+), 44 deletions(-)
> 
> Did the general solution I posted at
> <https://patchwork.kernel.org/patch/4807821/> not work for you?  ...or
> did you not see that?

Also, I don't think it's a good idea to set the io voltage bit simply from a 
dt setting without looking at the actual regulator voltage ... as a 1.8V 
setting when the regulator supplies 3.3V supposedly is able to damage the 
chip.


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