Thread (18 messages) 18 messages, 4 authors, 2012-11-07
STALE4952d
Revisions (2)
  1. v3 [diff vs current]
  2. v3 current

[PATCH v3 3/9] pinctrl: single: support pinconf generic

From: tony@atomide.com (Tony Lindgren)
Date: 2012-11-01 00:44:07

quoted hunk ↗ jump to hunk
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -20,6 +20,7 @@
 #include <linux/of_device.h>
 #include <linux/of_address.h>
 
+#include <linux/pinctrl/pinconf-generic.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 
@@ -28,6 +29,9 @@
 #define DRIVER_NAME			"pinctrl-single"
 #define PCS_MUX_PINS_NAME		"pinctrl-single,pins"
 #define PCS_MUX_BITS_NAME		"pinctrl-single,bits"
+#define PCS_BIAS_NAME			"pinctrl-single,bias"
+#define PCS_POWER_SOURCE_NAME		"pinctrl-single,power-source"
+#define PCS_SCHMITT_NAME		"pinctrl-single,input-schmitt"
 #define PCS_REG_NAME_LEN		((sizeof(unsigned long) * 2) + 1)
 #define PCS_OFF_DISABLED		~0U
 #define PCS_MAX_GPIO_VALUES		3
Here too you can remove the new defines.
 static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 						struct device_node *np,
 						struct pinctrl_map **map,
+						unsigned num_configs,
 						const char **pgnames)
 {
...

Then I suggest you add a generic pinconf-generic property to
indicate the controller supports pinconf. At least for omaps,
only some register ranges support pinconf. And by adding
pinconf-generic, you can parse it once during the probe of
pinctrl-single.c, and set pcs->pinconf flag.

Then you can use here and avoid calling of_property_read_u32
for about 600 times unnecessarily for omap4:

if (pcs->pinconf) {
+	if (!num_configs)
+		return 0;
+	config = devm_kzalloc(pcs->dev, sizeof(*config) * num_configs,
+			      GFP_KERNEL);
+	if (!config) {
+		res = -ENOMEM;
+		goto free_pingroup;
+	}
+	index = 0;
+
+	if (!of_property_read_u32(np, PCS_SCHMITT_NAME, &value))
+		config[index++] =
+			pinconf_to_config_packed(PIN_CONFIG_INPUT_SCHMITT,
+						 value & 0xffff);
+	if (!of_property_read_u32(np, PCS_BIAS_NAME, &value))
+		config[index++] =
+			pinconf_to_config_packed(PIN_CONFIG_BIAS_DISABLE,
+						 value & 0xffff);
+	if (!of_property_read_u32(np, PCS_POWER_SOURCE_NAME, &value))
+		config[index++] =
+			pinconf_to_config_packed(PIN_CONFIG_POWER_SOURCE,
+						 value & 0xffff);
}
quoted hunk ↗ jump to hunk
+static int pcs_dt_check_maps(struct device_node *np, unsigned *num_maps,
+			     unsigned *num_configs)
+{
+	unsigned size;
+
+	*num_maps = 0;
+	*num_configs = 0;
+	if (of_get_property(np, PCS_MUX_PINS_NAME, &size)
+		|| of_get_property(np, PCS_MUX_BITS_NAME, &size))
+		(*num_maps)++;
+	if (of_get_property(np, PCS_SCHMITT_NAME, &size))
+		(*num_configs)++;
+	if (of_get_property(np, PCS_BIAS_NAME, &size))
+		(*num_configs)++;
+	if (of_get_property(np, PCS_POWER_SOURCE_NAME, &size))
+		(*num_configs)++;
+	if (*num_configs)
+		(*num_maps)++;
+	if (!(*num_maps))
+		return -EINVAL;
+	return 0;
+}
+
 /**
  * pcs_dt_node_to_map() - allocates and parses pinctrl maps
  * @pctldev: pinctrl instance
@@ -802,29 +1019,32 @@ static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
 {
 	struct pcs_device *pcs;
 	const char **pgnames;
+	unsigned num_configs;
 	int ret;
 
 	pcs = pinctrl_dev_get_drvdata(pctldev);
Here too:

if (pcs->pinconf) {
  
-	*map = devm_kzalloc(pcs->dev, sizeof(**map), GFP_KERNEL);
+	ret = pcs_dt_check_maps(np_config, num_maps, &num_configs);
+	if (ret)
+		return ret;
+
+	*map = devm_kzalloc(pcs->dev, sizeof(**map) * (*num_maps), GFP_KERNEL);
 	if (!map)
 		return -ENOMEM;
} else {
 
-	*num_maps = 0;
-
}

Regards,

Tony
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