linux-kernel - Re: [PATCH v4 1/3] Runtime Interpreted Power Sequences

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Date:	Thu, 16 Aug 2012 15:14:19 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Leela Krishna Amudala <leelakrishna.a@...il.com>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH v4 1/3] Runtime Interpreted Power Sequences

On Thu, Aug 16, 2012 at 03:08:55PM +0900, Alexandre Courbot wrote:

> +		power-off-sequence {
> +			step0 {
> +				gpio = "enable";
> +				disable;

I'd change the name to "reset" or something in the example - avoids any
confusion with the action.

> +#ifdef CONFIG_REGULATOR
> +	case POWER_SEQ_REGULATOR:
> +		if (pdata->regulator.enable)
> +			err = regulator_enable(step->resource->regulator);
> +		else
> +			err = regulator_disable(step->resource->regulator);
> +		break;

The regulator and GPIO APIs should stub themselves out adequately to not
need the ifdefs at least for regulator I'd use the stubs since...

> +	/*
> +	 * should never happen unless the sequence includes a step which
> +	 * type does not have support compiled in
> +	 */
> +	default:
> +		return -EINVAL;

...this probably isn't what's meant.  It might also be nice to have
support for bulk_enable() but that's definitely something that could be
added later.

> +		err = power_seq_step_run(&seq->steps[cpt]);
> +		if (err) {
> +			dev_err(dev, "error %d while running power sequence!\n",
> +				err);
> +			return err;

I'd also log at least the step number, it'll make diagnostics easier.
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