Re: [PATCH v1 18/30] pwm: tegra: Support OPP and core voltage scaling

On Thu, Nov 05, 2020 at 02:44:15AM +0300, Dmitry Osipenko wrote:
[...]

+static void tegra_pwm_deinit_opp_table(void *data)
+{
+	struct device *dev = data;
+	struct opp_table *opp_table;
+
+	opp_table = dev_pm_opp_get_opp_table(dev);
+	dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_regulators(opp_table);
+	dev_pm_opp_put_opp_table(opp_table);
+}
+
+static int devm_tegra_pwm_init_opp_table(struct device *dev)
+{
+	struct opp_table *opp_table;
+	const char *rname = "core";
+	int err;
+
+	/* voltage scaling is optional */
+	if (device_property_present(dev, "core-supply"))
+		opp_table = dev_pm_opp_set_regulators(dev, &rname, 1);
+	else
+		opp_table = dev_pm_opp_get_opp_table(dev);
+
+	if (IS_ERR(opp_table))
+		return dev_err_probe(dev, PTR_ERR(opp_table),
+				     "failed to prepare OPP table\n");
+
+	/*
+	 * OPP table presence is optional and we want the set_rate() of OPP
+	 * API to work similarly to clk_set_rate() if table is missing in a
+	 * device-tree.  The add_table() errors out if OPP is missing in DT.
+	 */
+	if (device_property_present(dev, "operating-points-v2")) {
+		err = dev_pm_opp_of_add_table(dev);
+		if (err) {
+			dev_err(dev, "failed to add OPP table: %d\n", err);
+			goto put_table;
+		}
+	}
+
+	err = devm_add_action(dev, tegra_pwm_deinit_opp_table, dev);
+	if (err)
+		goto remove_table;
+
+	return 0;
+
+remove_table:
+	dev_pm_opp_of_remove_table(dev);
+put_table:
+	dev_pm_opp_put_regulators(opp_table);
+
+	return err;
+}

These two functions seem to be heavily boilerplate across all these
drivers. Have you considered splitting these out into separate helpers?

Thierry