On Tue, 12 Jan 2021 20:39:02 +0100
Andreas Kemnade [off-list ref] wrote:

[...]

quoted

+static int ntxec_pwm_probe(struct platform_device *pdev)
+{
+	struct ntxec *ec = dev_get_drvdata(pdev->dev.parent);
+	struct ntxec_pwm *priv;
+	struct pwm_chip *chip;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->ec = ec;
+	priv->dev = &pdev->dev;
+
+	platform_set_drvdata(pdev, priv);
+
+	chip = &priv->chip;
+	chip->dev = &pdev->dev;  

Hmm, I needed
chip->dev = &pdev->dev.parent to use the backlight example
in patch 2/7.
Not sure what the correct solution is. Maybe the pwm deserves its own
devicetree node.

probably just assigning the node from the parent.

   pdev->dev.of_node = pdev->dev.parent->of_node;

Regards,
Andreas