staging: regulator: hi6421v600-regulator: cleanup DT settings

Currently, an array is used to store both vsel and enable
settings, mixing registers, masks and bit settings.

Change it in order to have one separate property for each.

This makes easier to understand the contents of the DT
file, and to describe it at the Documentation/.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/fd72215b0a7da55dd727c2d7bd01c047a46cdd2e.1597647359.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421v600-regulator.c

@@ -45,8 +45,7 @@
 struct hi6421v600_regulator {
 	struct regulator_desc rdesc;
 	struct hi6421_spmi_pmic *pmic;
-	u8 eco_mode_mask;
+	u32 eco_mode_mask, eco_uA;
-	u32 eco_uA;
 };
 
 static DEFINE_MUTEX(enable_mutex);
@@ -226,36 +225,49 @@ static int hi6421_spmi_dt_parse(struct platform_device *pdev,
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
-	unsigned int register_info[3] = {0};
 	unsigned int *v_table;
 	int ret;
 
-	/* parse .register_info.enable_reg */
+	ret = of_property_read_u32(np, "reg", &rdesc->enable_reg);
-	ret = of_property_read_u32_array(np, "hi6421-ctrl",
-					 register_info, 3);
 	if (ret) {
-		dev_err(dev, "no hi6421-ctrl property set\n");
+		dev_err(dev, "missing reg property\nn");
 		return ret;
 	}
-	rdesc->enable_reg = register_info[0];
-	rdesc->enable_mask = register_info[1];
-	sreg->eco_mode_mask = register_info[2];
 
-	/* parse .register_info.vsel_reg */
+	ret = of_property_read_u32(np, "vsel-reg", &rdesc->vsel_reg);
-	ret = of_property_read_u32_array(np, "hi6421-vsel",
-					 register_info, 2);
 	if (ret) {
-		dev_err(dev, "no hi6421-vsel property set\n");
+		dev_err(dev, "missing vsel-reg property\n");
 		return ret;
 	}
-	rdesc->vsel_reg = register_info[0];
+
-	rdesc->vsel_mask = register_info[1];
+	ret = of_property_read_u32(np, "enable-mask", &rdesc->enable_mask);
+	if (ret) {
+		dev_err(dev, "missing enable-mask property\n");
+		return ret;
+	}
+
+	/*
+	 * Not all regulators work on idle mode
+	 */
+	ret = of_property_read_u32(np, "idle-mode-mask", &sreg->eco_mode_mask);
+	if (ret) {
+		dev_dbg(dev, "LDO doesn't support economy mode.\n");
+		sreg->eco_mode_mask = 0;
+		sreg->eco_uA = 0;
+	} else {
+		ret = of_property_read_u32(np, "eco-microamp",
+					&sreg->eco_uA);
+		if (ret) {
+			dev_err(dev, "missing eco-microamp property\n");
+			return ret;
+		}
+	}
 
 	/* parse .off-on-delay */
 	ret = of_property_read_u32(np, "off-on-delay-us",
 				   &rdesc->off_on_delay);
 	if (ret) {
-		dev_err(dev, "no off-on-delay-us property set\n");
+		dev_err(dev, "missing off-on-delay-us property\n");
 		return ret;
 	}
 
@@ -263,21 +275,13 @@ static int hi6421_spmi_dt_parse(struct platform_device *pdev,
 	ret = of_property_read_u32(np, "startup-delay-us",
 				   &rdesc->enable_time);
 	if (ret) {
-		dev_err(dev, "no startup-delay-us property set\n");
+		dev_err(dev, "missing startup-delay-us property\n");
 		return ret;
 	}
 
 	/* FIXME: are there a better value for this? */
 	rdesc->ramp_delay = rdesc->enable_time;
 
-	/* parse .eco_uA */
-	ret = of_property_read_u32(np, "eco-microamp",
-				   &sreg->eco_uA);
-	if (ret) {
-		sreg->eco_uA = 0;
-		ret = 0;
-	}
-
 	/* parse volt_table */
 
 	rdesc->n_voltages = of_property_count_u32_elems(np, "voltage-table");
@@ -291,10 +295,21 @@ static int hi6421_spmi_dt_parse(struct platform_device *pdev,
 	ret = of_property_read_u32_array(np, "voltage-table",
 					 v_table, rdesc->n_voltages);
 	if (ret) {
-		dev_err(dev, "no voltage-table property set\n");
+		dev_err(dev, "missing voltage-table property\n");
 		return ret;
 	}
 
+	/*
+	 * Instead of explicitly requiring a mask for the voltage selector,
+	 * as they all start from bit zero (at least on the known LDOs),
+	 * just use the number of voltages at the voltage table, getting the
+	 * minimal mask that would pick everything.
+	 */
+	rdesc->vsel_mask = (1 << (fls(rdesc->n_voltages) - 1)) - 1;
+
+	dev_dbg(dev, "voltage selector settings: reg: 0x%x, mask: 0x%x",
+		rdesc->vsel_reg, rdesc->vsel_mask);
+
 	return 0;
 }