linux-kernel - Re: [PATCH v2 1/5] video: omapdss: Add opa362 driver

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Message-ID: <54731AE5.7080607@ti.com>
Date:	Mon, 24 Nov 2014 13:47:49 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
CC:	Marek Belisko <marek@...delico.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>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	<grant.likely@...aro.org>, <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	<linux-fbdev@...r.kernel.org>, <gta04-owner@...delico.com>
Subject: Re: [PATCH v2 1/5] video: omapdss: Add opa362 driver

On 19/11/14 17:10, Dr. H. Nikolaus Schaller wrote:

>> You don't need to ask. The connector calls invert_vid_out_polarity
>> before enabling the output.
> 
> Unfortunately it doesn’t. At least not always.
> 
> It does only for pdata systems but not for DT based systems:
> 
> 	if (!ddata->dev->of_node) {
> 		in->ops.atv->set_type(in, ddata->connector_type);
> 		in->ops.atv->invert_vid_out_polarity(in,
> 			ddata->invert_polarity);
> 	}
> 
> Not calling is in our case different from calling with ddata->invert_polarity == 0.

Ah, sorry, my mistake. I should've read the code more carefully =).

So, with DT only approach, those calls above are not supported. If you
make the OPA driver DT only, you can remove those functions.

You only need to set the invert-polarity property in the venc DT node.

 Tomi



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