Hi Russell,
Am Donnerstag, den 06.03.2014, 13:03 +0000 schrieb Russell King - ARM
Linux:
> On Wed, Mar 05, 2014 at 10:20:57AM +0100, Philipp Zabel wrote:
> > This patch fixes the TV Encoder DDC I2C bus property to use the common
> > 'ddc-i2c-bus' property name instead of 'ddc'.
>
> Looking at both hdmi and tve, the ddc part is very similar. The difference
> is how the probe is handled:
>
> imx-hdmi:
> ddc_node = of_parse_phandle(np, "ddc", 0);
> if (ddc_node) {
> hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node);
> if (!hdmi->ddc)
> dev_dbg(hdmi->dev, "failed to read ddc node\n");
>
> of_node_put(ddc_node);
> } else {
> dev_dbg(hdmi->dev, "no ddc property found\n");
> }
>
> imx-tve:
> ddc_node = of_parse_phandle(np, "ddc", 0);
> if (ddc_node) {
> tve->ddc = of_find_i2c_adapter_by_node(ddc_node);
> of_node_put(ddc_node);
> }
panel-simple.c
ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
if (ddc) {
panel->ddc = of_find_i2c_adapter_by_node(ddc);
of_node_put(ddc);
if (!panel->ddc) {
err = -EPROBE_DEFER;
goto free_backlight;
}
}
>It appears to differ only by debug prints - is there any reason we
> couldn't unify the DDC backend part? I've tinkered with this idea,
> and already have a patch, though it needs a little rework.
>
> Any thoughts?
there should be a generic helper for obtaining the DDC I2C adapter from
the device tree. I'd prefer not to stall the imx-drm-dt series on this,
though.
regards
Philipp
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