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Date: Wed, 08 Aug 2012 12:47:32 -0600
From: Stephen Warren <swarren@wwwdotorg.org>
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To: Tony Prisk <linux@prisktech.co.nz>
CC: vt8500-wm8505-linux-kernel@googlegroups.com, linux-fbdev@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-doc@vger.kernel.org,
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        Eric Andersson <eric.andersson@unixphere.com>,
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        devicetree-discuss@lists.ozlabs.org,
        Rob Herring <rob.herring@calxeda.com>,
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        Mark Brown <broonie@opensource.wolfsonmicro.com>,
        linux-kernel@vger.kernel.org, Felipe Balbi <balbi@ti.com>
Subject: Re: [PATCH 5/8] video: vt8500: Add devicetree support for vt8500-fb
 and wm8505-fb
References: <1344389967-8465-1-git-send-email-linux@prisktech.co.nz> <1344389967-8465-6-git-send-email-linux@prisktech.co.nz>
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On 08/07/2012 07:39 PM, Tony Prisk wrote:
> Update vt8500-fb, wm8505-fb and wmt-ge-rops to support device
> tree bindings.

> Small change in wm8505-fb.c to support WM8650 framebuffer color
> format.

That might warrant a separate patch?

> diff --git a/drivers/video/vt8500lcdfb.c b/drivers/video/vt8500lcdfb.c

> +	np = of_find_node_by_name(NULL, "display");
> +	if (!np) {
> +		pr_err("%s: No display description in Device Tree\n", __func__);
> +		ret = -EINVAL;
> +		goto failed_free_res;
> +	}

I believe that using hard-coded node names is frowned upon. Better would
be to put a phandle into the display controller's node that points at
the node representing the display, e.g.:

    fb@d800e400 {
        compatible = "via,vt8500-fb";
        reg = <0xd800e400 0x400>;
        interrupts = <12>;
        via,display = <&display>;
    };
    display: display {
        ...
    };