From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philipp Zabel <p.zabel@pengutronix.de>
Subject: Re: [PATCH v15 06/12] dt-bindings: add document for dw_hdmi
Date: Wed, 03 Dec 2014 10:19:58 +0100
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To: Andy Yan <andy.yan@rock-chips.com>
Cc: Mark Rutland <mark.rutland@arm.com>, heiko@sntech.de, airlied@linux.ie, dri-devel@lists.freedesktop.org, ykk@rock-chips.com, devel@driverdev.osuosl.org, Arnd Bergmann <arnd@arndb.de>, linux-rockchip@lists.infradead.org, Grant Likely <grant.likely@linaro.org>, rmk+kernel@arm.linux.org.uk, jay.xu@rock-chips.com, devicetree@vger.kernel.org, Zubair.Kakakhel@imgtec.com, Pawel Moll <pawel.moll@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Inki Dae <inki.dae@samsung.com>, Rob Herring <robh+dt@kernel.org>, Sean Paul <seanpaul@chromium.org>, Dave Airlie <airlied@redhat.com>, mark.yao@rock-chips.com, fabio.estevam@freescale.com, Josh Boyer <jwboyer@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-kernel@vger.kernel.org, djkurtz@google.com, Kumar Gala <galak@codeaurora.org>, Shawn Guo <shawn.guo@linaro.org>, vladimir_zapolskiy@mentor.comLucas Stach <l>
List-Id: devicetree@vger.kernel.org

Hi Andy,

Am Mittwoch, den 03.12.2014, 08:54 +0800 schrieb Andy Yan:
> >> +Required properities:
> >> +- compatible: platform specific such as:
> >> +   * "fsl,imx6q-hdmi"
> >> +   * "fsl,imx6dl-hdmi"
> >> +   * "rockchip,rk3288-dw-hdmi"
> > I think we should add a common compatible value "snps,dw-hdmi-tx" here:
> >
> > 	compatible = "fsl,imx6q-hdmi", "snps,dw-hdmi-tx";
> >
>       How about "snps,dw-hdmi", because the driver is not only about
>    hdmi tx, but also include hdmi phy.

Synopsys call the whole module
"DesignWare HDMI Transmitter (TX) IP Solution":

https://www.synopsys.com/dw/ipdir.php?ds=dwc_hdmi_14_csds_tx
https://www.synopsys.com/dw/ipdir.php?ds=dwc_hdmi_20_csds_tx

That includes the PHY. I'd prefer keeping the -tx in there to
differentiate from a possible future "snps,dw-hdmi-rx":

https://www.synopsys.com/dw/ipdir.php?ds=dwc_hdmi_14_csds_rx
https://www.synopsys.com/dw/ipdir.php?ds=dwc_hdmi_20_csds_rx

>        If we add such compatible value, do we have to implement another
>     platform driver like dw_hdmi-pltfm.c with the 
> compatible="snps,dw-hdmi" ,
>     or just include the compatible value in dw_hdmi-imx.c and 
> dw_hdmi-rockchip.c?

That common compatible doesn't have to be used by any driver. It's just
there to show these are the same/similar IP core.
If a common driver without any SoC specific knowledge could be written,
that one would match against the common compatible.

regards
Philipp