On Thu, Sep 24, 2015 at 5:36 AM, Jean-Francois Moine <moinejf@xxxxxxx> wrote: > On Mon, 21 Sep 2015 10:19:18 -0500 > Rob Herring <robh@xxxxxxxxxx> wrote: > >> On 09/18/2015 06:06 AM, Jyri Sarha wrote: >> > From: Jean-Francois Moine <moinejf@xxxxxxx> >> > >> > Two kinds of ports may be declared in a DT graph of ports: video and audio. >> > This patch accepts the port value from a video port as an alternative >> > to the video-ports property. >> > It also accepts audio ports in the case the transmitter is not used as >> > a slave encoder. >> > The new file include/sound/tda998x.h prepares to the definition of >> > a tda998x CODEC. >> > >> > Signed-off-by: Jean-Francois Moine <moinejf@xxxxxxx> >> > Signed-off-by: Jyri Sarha <jsarha@xxxxxx> >> > --- > [snip] >> > diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt >> > index e9e4bce..35f6a80 100644 >> > --- a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt >> > +++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt >> > @@ -16,6 +16,35 @@ Optional properties: >> > >> > - video-ports: 24 bits value which defines how the video controller >> > output is wired to the TDA998x input - default: <0x230145> >> > + This property is not used when ports are defined. >> > + >> > +Optional nodes: >> > + >> > + - port: up to three ports. >> > + The ports are defined according to [1]. >> > + >> > + Video port. >> > + There may be only one video port. >> > + This one must contain the following property: >> > + >> > + - port-type: must be "rgb" >> >> Why do you need this if there is no other choice? The port number should >> define which one is video. > > There is no specific port number. > One of the ports is video and two other ones are audio. I saying you should define the port numbering in the binding. Port 0 is video, Port 1 is i2s, etc. > >> > + >> > + and may contain the optional property: >> > + >> > + - reg: 24 bits value which defines how the video controller >> > + output is wired to the TDA998x input (video pins) >> > + When absent, the default value is <0x230145>. >> >> I'm failing to decode how this value works. In any case, I would keep >> this as a vendor specific property rather than abusing reg. > > This has been explained in > https://lkml.org/lkml/2014/1/20/86 Okay, so that explains how it works, but still it should not be in reg. > >> > + >> > + Audio ports. >> > + There may be one or two audio ports. >> > + These ones must contain the following properties: >> > + >> > + - port-type: must be "i2s" or "spdif" >> > + >> > + - reg: 8 bits value which defines how the audio controller >> > + output is wired to the TDA998x input (audio pins) >> >> reg is 32-bits. > > This port has only 8 significant bits as explained in > https://lkml.org/lkml/2015/1/7/362 Maybe only 8-bits are used, but the size of the data in the DTB is 32-bits unless you add 8-bit annotation. Again, reg is not appropriate to use here. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
