[PATCH 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>
---
 drivers/gpio/qcom_pmic_gpio.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpio/qcom_pmic_gpio.c b/drivers/gpio/qcom_pmic_gpio.c
index 3dbc02d83198..e6405881c637 100644
--- a/drivers/gpio/qcom_pmic_gpio.c
+++ b/drivers/gpio/qcom_pmic_gpio.c
@@ -247,11 +247,37 @@ 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);
+	if (!uc_priv->gpio_count) {
+		ret = qcom_gpio_of_parse_ranges(dev);
+		if (ret > 0)
+			uc_priv->gpio_count = ret;
+		else
+			printf("gpio-ranges error: %d\n", ret);
+	}
 	uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
 	if (uc_priv->bank_name == NULL)
 		uc_priv->bank_name = "qcom_pmic";

-- 
2.42.0