On czw, 2014-10-30 at 12:50 +0100, Javier Martinez Canillas wrote:
> Hello Krzysztof,
>
> On 10/30/2014 12:20 PM, Krzysztof Kozlowski wrote:
> > static int max77802_pmic_probe(struct platform_device *pdev)
> > {
> > struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> > - struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
> > struct max77802_regulator_prv *max77802;
> > - int i, ret = 0, val;
> > + int i, val;
> > struct regulator_config config = { };
> >
> > - /* This is allocated by the MFD driver */
> > - if (!pdata) {
> > - dev_err(&pdev->dev, "no platform data found for regulator\n");
> > - return -ENODEV;
> > - }
> > -
> > max77802 = devm_kzalloc(&pdev->dev,
> > sizeof(struct max77802_regulator_prv),
> > GFP_KERNEL);
> > if (!max77802)
> > return -ENOMEM;
> >
> > - if (iodev->dev->of_node) {
> > - ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
> > - if (ret)
> > - return ret;
> > + if (!pdev->dev.of_node) {
> > + /*
> > + * Backward DTS compatiblity where regulator driver had not
> > + * a compatible property for itself.
> > + */
> > + if (!iodev->dev->of_node) {
> > + dev_err(&pdev->dev, "No OF node for driver and its parent\n");
> > + return -EINVAL;
> > + }
> > + pdev->dev.of_node = of_get_child_by_name(iodev->dev->of_node,
> > + "regulators");
> > + max77802->missing_of_node = true;
> > }
>
> I may be missing something but I don't understand why a compatible string
> for the regulators sub-node is needed. Isn't enough to just fill the
> .regulators_node field in the struct regulator_desc? e.g:
>
> .regulators_node = of_match_ptr("regulators") for max77802
> .regulators_node = of_match_ptr("voltage-regulators") for max77686
>
> AFAIU this should be enough for the core to extract the init_data and will
> make your change much more simpler and you can drop patches 1-3 and 13-14.
>
> Or maybe I misread the regulator_of_get_init_data() function?
The regulator_of_get_init_data() searches from dev->of_node or its child
node.
But dev->of_node is NULL.
That's why of_compatible is needed.
Best regards,
Krzysztof
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