[PATCH v1 1/2] pinctrl: single: Parse gpio details from dt

[Bharat Kumar Reddy Gooty]

From: Bharat Gooty <bharat.gooty at broadcom.com>

Parse different gpio properties from dt as part of probe
function. This detail is required to enable pinctrl pad
later when gpio lines are requested.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur at broadcom.com>
Signed-off-by: Bharat Gooty <bharat.gooty at broadcom.com>
---
 drivers/pinctrl/pinctrl-single.c | 52 ++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index cf9ad3670f..0f96cd5870 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <dm/device_compat.h>
 #include <dm/devres.h>
+#include <dm/of_access.h>
 #include <dm/pinctrl.h>
 #include <linux/libfdt.h>
 #include <linux/list.h>
@@ -44,11 +45,27 @@ struct single_func {
 	unsigned int *pins;
 };
 
+/**
+ * struct single_gpiofunc_range - pin ranges with same mux value of gpio fun
+ * @offset: offset base of pins
+ * @npins: number pins with the same mux value of gpio function
+ * @gpiofunc: mux value of gpio function
+ * @node: list node
+ */
+struct single_gpiofunc_range {
+	u32 offset;
+	u32 npins;
+	u32 gpiofunc;
+	struct list_head node;
+};
+
 /**
  * struct single_priv - private data
  * @bits_per_pin: number of bits per pin
  * @npins: number of selectable pins
  * @pin_name: temporary buffer to store the pin name
+ * @functions: list pin functions
+ * @gpiofuncs: list gpio functions
  */
 struct single_priv {
 #if (IS_ENABLED(CONFIG_SANDBOX))
@@ -58,6 +75,7 @@ struct single_priv {
 	unsigned int npins;
 	char pin_name[PINNAME_SIZE];
 	struct list_head functions;
+	struct list_head gpiofuncs;
 };
 
 /**
@@ -454,6 +472,36 @@ static int single_get_pins_count(struct udevice *dev)
 	return priv->npins;
 }
 
+static int single_add_gpio_func(struct udevice *dev)
+{
+	struct single_priv *priv = dev_get_priv(dev);
+	const char *propname = "pinctrl-single,gpio-range";
+	const char *cellname = "#pinctrl-single,gpio-range-cells";
+	struct single_gpiofunc_range *range;
+	struct ofnode_phandle_args gpiospec;
+	int ret, i;
+
+	for (i = 0; ; i++) {
+		ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), propname,
+						     cellname, 0, i, &gpiospec);
+		/* Do not treat it as error. Only treat it as end condition. */
+		if (ret) {
+			ret = 0;
+			break;
+		}
+		range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
+		if (!range) {
+			ret = -ENOMEM;
+			break;
+		}
+		range->offset = gpiospec.args[0];
+		range->npins = gpiospec.args[1];
+		range->gpiofunc = gpiospec.args[2];
+		list_add_tail(&range->node, &priv->gpiofuncs);
+	}
+	return ret;
+}
+
 static int single_probe(struct udevice *dev)
 {
 	struct single_pdata *pdata = dev_get_plat(dev);
@@ -461,6 +509,7 @@ static int single_probe(struct udevice *dev)
 	u32 size;
 
 	INIT_LIST_HEAD(&priv->functions);
+	INIT_LIST_HEAD(&priv->gpiofuncs);
 
 	size = pdata->offset + pdata->width / BITS_PER_BYTE;
 	#if (CONFIG_IS_ENABLED(SANDBOX))
@@ -483,6 +532,9 @@ static int single_probe(struct udevice *dev)
 		priv->npins *= (pdata->width / priv->bits_per_pin);
 	}
 
+	if (single_add_gpio_func(dev))
+		dev_dbg(dev, "gpio functions are not added\n");
+
 	dev_dbg(dev, "%d pins\n", priv->npins);
 	return 0;
 }
-- 
2.17.1


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