Re: [PATCH v7][ 3/5] video: mx3fb: Introduce regulator support.

[Sascha Hauer <s.hauer@pengutronix.de>]

[Added Mark to Cc]

On Fri, Mar 14, 2014 at 10:12:47AM +0100, Denis Carikli wrote:
>  
> +		of_property_read_string(display_np, "regulator-name",
> +					&regulator_name);
> +

[...]

> +	/* In dt mode,
> +	 * using devm_regulator_get would require that the proprety referencing
> +	 * the regulator phandle has to be inside the mx3fb node.
> +	 */
> +	if (np) {
> +		if (regulator_name)
> +			mx3fbi->reg_lcd = regulator_get(NULL, regulator_name);
> +
> +		if (IS_ERR(mx3fbi->reg_lcd))
> +			return PTR_ERR(mx3fbi->reg_lcd);
> +	} else {
> +		/* Permit that driver without a regulator in non-dt mode */
> +		mx3fbi->reg_lcd = regulator_get(dev, "lcd");
> +	}

This patch adds regulator support for the display of a i.MX3 IPU. The
problem Denis has to solve here is that he needs to get the regulator,
but the display devicenode doesn't have a struct device associated with
it, so he cannot provide one to regulator_get(). One way out here could
be a of_regulator_get(struct device_node *). Mark, would this be ok with
you?

(Of course a proper driver for the display would be nicer, but this
would immediately bring us to some Common display framework, something
which is being worked on quite a while now without success)

Sascha

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