linux-kernel - Re: [PATCH] drm: bridge: ldb: add support for using channel 1 only

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Date:   Wed, 5 Apr 2023 14:31:31 +0200
From:   Marek Vasut <marex@...x.de>
To:     Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH] drm: bridge: ldb: add support for using channel 1 only

On 4/5/23 09:30, Luca Ceresoli wrote:

[...]

>>> @@ -311,10 +314,23 @@ static int fsl_ldb_probe(struct platform_device *pdev)
>>>    	if (IS_ERR(fsl_ldb->regmap))
>>>    		return PTR_ERR(fsl_ldb->regmap);
>>>    
>>> -	/* Locate the panel DT node. */
>>> -	panel_node = of_graph_get_remote_node(dev->of_node, 1, 0);
>>> -	if (!panel_node)
>>> -		return -ENXIO;
>>> +	/* Locate the remote ports and the panel node */
>>> +	remote1 = of_graph_get_remote_node(dev->of_node, 1, 0);
>>> +	remote2 = of_graph_get_remote_node(dev->of_node, 2, 0);
>>> +	fsl_ldb->ch0_enabled = (remote1 != NULL);
>>> +	fsl_ldb->ch1_enabled = (remote2 != NULL);
>>> +	panel_node = of_node_get(remote1 ? remote1 : remote2);
>>
>> You can even do this without the middle 'remote1' I think:
>>
>> panel_node = of_node_get(remote1 ? : remote2);
> 
> Apparently, but honestly with such short expressions clearly having no
> side effects I think it's not helping readability.

I think even the ternary operator itself isn't helpful much, but that's 
a matter of taste, and I don't have a better suggestion which would 
improve the readability either (I tried to expand it into if()... but 
that looks bad too).

No need to change anything.

[...]

Thanks for the patch.