linux-kernel - Re: [PATCH] ASoC: tda998x: Fix lack of required reg in DT documentation

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Message-ID: <20140320145221.09252bf6@armhf>
Date:	Thu, 20 Mar 2014 14:52:21 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: tda998x: Fix lack of required reg in DT
 documentation

On Thu, 20 Mar 2014 14:32:18 +0100
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> wrote:

> Ok, I had another round of google'ing and found this:
> http://hipstercircuits.com/wp-content/uploads/2013/05/TDA19988.pdf
> 
> There, the datasheet specifically for TDA19988 only states 0x70 and
> 0x34 as the two i2c addresses. Therefore, TDA19988 has fixed i2c
> addresses while TDA9983b has configurable (main) i2c address.
> 
> Not as easy as we thought ;)
> 
> I suggest reword the reg property to:
> "- reg: shall be set to the I2C address"
> 
> and optionally list all known addresses for each TDA[1]998x in the
> binding.

Thanks for the link.

OK, then, as the linux tda998x driver handles only the tda 19988 and
19989 chips, the HDMI I2C address is always 0x70.

So, question: Russell and Sebastian, do you still want an other patch?

Other question: the CEC address is hard-coded to 0x34 in the driver.
Should it be configurable in the DT?

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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