[PATCHv5][ 5/8] staging: imx-drm: parallel display: add regulator support.

[Thierry Reding]

On Thu, Dec 05, 2013 at 07:28:09PM +0100, Denis Carikli wrote:
[...]
> diff --git a/drivers/staging/imx-drm/parallel-display.c b/drivers/staging/imx-drm/parallel-display.c
[...]
> @@ -260,6 +275,13 @@ static int imx_pd_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> +	imxpd->disp_reg = devm_regulator_get(&pdev->dev, "display");
> +	if (PTR_ERR(imxpd->disp_reg) == -EPROBE_DEFER)
> +		return -EPROBE_DEFER;
> +
> +	if (IS_ERR(imxpd->disp_reg))
> +		dev_dbg(&pdev->dev, "Operating without display regulator.\n");

I don't think this is necessary. There is code in the regulator core
nowadays that supplies a dummy regulator if one hasn't been hooked up in
devicetree explicitly. So any error that you get at this point is likely
a valid one rather than just a missing regulator.

The advantage is that you no longer have to check at every step of the
way that the regulator is valid before calling the regulator API.

Thierry
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