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SubjectRe: [PATCH V1 2/6] regulator: da9062: DA9062 regulator driver
On Fri, Apr 17, 2015 at 03:23:32PM +0100, S Twiss wrote:

> +/* Regulator interrupt handlers */
> +static irqreturn_t da9062_ldo_lim_event(int irq, void *data)
> +{
> + struct da9062_regulators *regulators = data;
> + struct da9062 *hw = regulators->regulator[0].hw;
> + struct da9062_regulator *regl;
> + int bits, i, ret;
> +
> + ret = regmap_read(hw->regmap, DA9062AA_STATUS_D, &bits);
> + if (ret < 0)
> + return IRQ_NONE;

Please log an error for this, if we're having trouble talking to the
device that seems like a serious issue.

> + for (i = regulators->n_regulators - 1; i >= 0; i--) {
> + regl = &regulators->regulator[i];
> + if (regl->info->oc_event.reg != DA9062AA_STATUS_D)
> + continue;
> +
> + if (BIT(regl->info->oc_event.lsb) & bits)
> + regulator_notifier_call_chain(regl->rdev,
> + REGULATOR_EVENT_OVER_CURRENT, NULL);
> + }
> +
> + return IRQ_HANDLED;

This will return IRQ_HANDLED even if none of the regulators were
flagginng an event.

> +static irqreturn_t da9062_vdd_warn_event(int irq, void *data)
> +{
> + return IRQ_HANDLED;
> +}

Ignoring an interrupt is not usefully handling it - at the *least* this
should be generating a log message.

> +static struct da9062_regulators_pdata *da9062_parse_regulators_dt(
> + struct platform_device *pdev,
> + struct of_regulator_match **reg_matches)
> +{
> + struct da9062_regulators_pdata *pdata;
> + struct da9062_regulator_data *rdata;
> + struct device_node *node;
> + int i, n, num;
> +
> + node = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
> + if (!node) {
> + dev_err(&pdev->dev, "Regulators device node not found\n");
> + return ERR_PTR(-ENODEV);
> + }
> +
> + num = of_regulator_match(&pdev->dev, node, da9062_matches,
> + ARRAY_SIZE(da9062_matches));

Don't open code this, describe the DT names in the regualtor_desc and
let the core register.

> + if (IS_ERR(pdata) || pdata->n_regulators == 0) {
> + dev_err(&pdev->dev,
> + "No regulators defined for the platform\n");
> + return PTR_ERR(pdata);
> + }
> +
> + n_regulators = ARRAY_SIZE(local_regulator_info),

This is broken, the set of regulators in the silicon is not a property
of the platform. The driver should just register all the regualtors
that are present in the silicon. I'm fairly sure I've been through this
before...

> + ret = request_threaded_irq(irq,
> + NULL, da9062_vdd_warn_event,
> + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> + "VDD_WARN", regulators);

devm_request_threaded_irq().
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