[PATCH v4 3/5] gpio: qcom_pmic: fix support for upstream DT

[Caleb Connolly]

Linux devicetrees use the "gpio-ranges" property, add support for
parsing it instead of "gpio-count" so that upstream DTs can be used with
U-Boot.

Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 arch/arm/dts/dragonboard410c.dts |  3 +--
 arch/arm/dts/dragonboard820c.dts |  3 +--
 arch/arm/dts/qcs404-evb.dts      |  2 +-
 arch/arm/dts/sdm845.dtsi         |  3 +--
 drivers/gpio/qcom_pmic_gpio.c    | 38 ++++++++++++++++++++++++++++++--------
 5 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/arch/arm/dts/dragonboard410c.dts b/arch/arm/dts/dragonboard410c.dts
index c41fee977813..6a4e3ccf17b1 100644
--- a/arch/arm/dts/dragonboard410c.dts
+++ b/arch/arm/dts/dragonboard410c.dts
@@ -170,9 +170,8 @@
 					compatible = "qcom,pm8916-gpio";
 					reg = <0xc000 0x400>;
 					gpio-controller;
-					gpio-count = <4>;
+					gpio-ranges = <&pm8916_gpios 0 0 4>;
 					#gpio-cells = <2>;
-					gpio-bank-name="pmic";
 				};
 			};
 
diff --git a/arch/arm/dts/dragonboard820c.dts b/arch/arm/dts/dragonboard820c.dts
index 0d9c9f7a4922..146a0af8aafe 100644
--- a/arch/arm/dts/dragonboard820c.dts
+++ b/arch/arm/dts/dragonboard820c.dts
@@ -132,9 +132,8 @@
 					compatible = "qcom,pm8994-gpio";
 					reg = <0xc000 0x400>;
 					gpio-controller;
-					gpio-count = <24>;
+					gpio-ranges = <&pm8994_gpios 0 0 22>;
 					#gpio-cells = <2>;
-					gpio-bank-name="pm8994.";
 				};
 			};
 
diff --git a/arch/arm/dts/qcs404-evb.dts b/arch/arm/dts/qcs404-evb.dts
index 84224a8a3d39..3bb580ba4e17 100644
--- a/arch/arm/dts/qcs404-evb.dts
+++ b/arch/arm/dts/qcs404-evb.dts
@@ -378,7 +378,7 @@
 					compatible = "qcom,pms405-gpio";
 					reg = <0xc000 0x400>;
 					gpio-controller;
-					gpio-count = <12>;
+					gpio-ranges = <&pms405_gpios 0 0 12>;
 					#gpio-cells = <2>;
 					gpio-bank-name="pmic";
 				};
diff --git a/arch/arm/dts/sdm845.dtsi b/arch/arm/dts/sdm845.dtsi
index cd5d890e9a45..a26e9f411ee0 100644
--- a/arch/arm/dts/sdm845.dtsi
+++ b/arch/arm/dts/sdm845.dtsi
@@ -103,9 +103,8 @@
 					compatible = "qcom,pm8998-gpio";
 					reg = <0xc000 0x1a00>;
 					gpio-controller;
-					gpio-count = <21>;
+					gpio-ranges = <&pm8998_gpios 0 0 26>;
 					#gpio-cells = <2>;
-					gpio-bank-name = "pm8998.";
 				};
 			};
 
diff --git a/drivers/gpio/qcom_pmic_gpio.c b/drivers/gpio/qcom_pmic_gpio.c
index 7b83c67fa464..1adc6566a36d 100644
--- a/drivers/gpio/qcom_pmic_gpio.c
+++ b/drivers/gpio/qcom_pmic_gpio.c
@@ -245,23 +245,45 @@ static int qcom_gpio_probe(struct udevice *dev)
 	return 0;
 }
 
+/*
+ * Parse basic GPIO count specified via the gpio-ranges property
+ * as specified in Linux devicetrees
+ * Returns < 0 on error, otherwise gpio count
+ */
+static int qcom_gpio_of_parse_ranges(struct udevice *dev)
+{
+	int ret;
+	struct ofnode_phandle_args args;
+
+	ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "gpio-ranges",
+					     NULL, 3, 0, &args);
+	if (ret)
+		return log_msg_ret("gpio-ranges", ret);
+
+	return args.args[2];
+}
+
 static int qcom_gpio_of_to_plat(struct udevice *dev)
 {
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	int ret;
 
-	uc_priv->gpio_count = dev_read_u32_default(dev, "gpio-count", 0);
-	uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
-	if (uc_priv->bank_name == NULL)
-		uc_priv->bank_name = "qcom_pmic";
+	ret = qcom_gpio_of_parse_ranges(dev);
+	if (ret > 0)
+		uc_priv->gpio_count = ret;
+	else
+		return ret;
+
+	uc_priv->bank_name = "pmic";
 
 	return 0;
 }
 
 static const struct udevice_id qcom_gpio_ids[] = {
-	{ .compatible = "qcom,pm8916-gpio" },
-	{ .compatible = "qcom,pm8994-gpio" },	/* 22 GPIO's */
-	{ .compatible = "qcom,pm8998-gpio" },
-	{ .compatible = "qcom,pms405-gpio" },
+	{ .compatible = "qcom,pm8916-gpio", },
+	{ .compatible = "qcom,pm8994-gpio", },
+	{ .compatible = "qcom,pm8998-gpio", },
+	{ .compatible = "qcom,pms405-gpio", },
 	{ }
 };
 

-- 
2.42.1