static int rzg2l_dt_subnode_to_map()

in renesas/pinctrl-rzg2l.c [236:372]

• 112 lines of code
• 23 McCabe index (conditional complexity)

static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
				   struct device_node *np,
				   struct pinctrl_map **map,
				   unsigned int *num_maps,
				   unsigned int *index)
{
	struct rzg2l_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
	struct pinctrl_map *maps = *map;
	unsigned int nmaps = *num_maps;
	unsigned long *configs = NULL;
	unsigned int *pins, *psel_val;
	unsigned int num_pinmux = 0;
	unsigned int idx = *index;
	unsigned int num_pins, i;
	unsigned int num_configs;
	struct property *pinmux;
	struct property *prop;
	int ret, gsel, fsel;
	const char **pin_fn;
	const char *pin;

	pinmux = of_find_property(np, "pinmux", NULL);
	if (pinmux)
		num_pinmux = pinmux->length / sizeof(u32);

	ret = of_property_count_strings(np, "pins");
	if (ret == -EINVAL) {
		num_pins = 0;
	} else if (ret < 0) {
		dev_err(pctrl->dev, "Invalid pins list in DT\n");
		return ret;
	} else {
		num_pins = ret;
	}

	if (!num_pinmux && !num_pins)
		return 0;

	if (num_pinmux && num_pins) {
		dev_err(pctrl->dev,
			"DT node must contain either a pinmux or pins and not both\n");
		return -EINVAL;
	}

	ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
	if (ret < 0)
		return ret;

	if (num_pins && !num_configs) {
		dev_err(pctrl->dev, "DT node must contain a config\n");
		ret = -ENODEV;
		goto done;
	}

	if (num_pinmux)
		nmaps += 1;

	if (num_pins)
		nmaps += num_pins;

	maps = krealloc_array(maps, nmaps, sizeof(*maps), GFP_KERNEL);
	if (!maps) {
		ret = -ENOMEM;
		goto done;
	}

	*map = maps;
	*num_maps = nmaps;
	if (num_pins) {
		of_property_for_each_string(np, "pins", prop, pin) {
			ret = rzg2l_map_add_config(&maps[idx], pin,
						   PIN_MAP_TYPE_CONFIGS_PIN,
						   configs, num_configs);
			if (ret < 0)
				goto done;

			idx++;
		}
		ret = 0;
		goto done;
	}

	pins = devm_kcalloc(pctrl->dev, num_pinmux, sizeof(*pins), GFP_KERNEL);
	psel_val = devm_kcalloc(pctrl->dev, num_pinmux, sizeof(*psel_val),
				GFP_KERNEL);
	pin_fn = devm_kzalloc(pctrl->dev, sizeof(*pin_fn), GFP_KERNEL);
	if (!pins || !psel_val || !pin_fn) {
		ret = -ENOMEM;
		goto done;
	}

	/* Collect pin locations and mux settings from DT properties */
	for (i = 0; i < num_pinmux; ++i) {
		u32 value;

		ret = of_property_read_u32_index(np, "pinmux", i, &value);
		if (ret)
			goto done;
		pins[i] = value & MUX_PIN_ID_MASK;
		psel_val[i] = MUX_FUNC(value);
	}

	/* Register a single pin group listing all the pins we read from DT */
	gsel = pinctrl_generic_add_group(pctldev, np->name, pins, num_pinmux, NULL);
	if (gsel < 0) {
		ret = gsel;
		goto done;
	}

	/*
	 * Register a single group function where the 'data' is an array PSEL
	 * register values read from DT.
	 */
	pin_fn[0] = np->name;
	fsel = pinmux_generic_add_function(pctldev, np->name, pin_fn, 1,
					   psel_val);
	if (fsel < 0) {
		ret = fsel;
		goto remove_group;
	}

	maps[idx].type = PIN_MAP_TYPE_MUX_GROUP;
	maps[idx].data.mux.group = np->name;
	maps[idx].data.mux.function = np->name;
	idx++;

	dev_dbg(pctrl->dev, "Parsed %pOF with %d pins\n", np, num_pinmux);
	ret = 0;
	goto done;

remove_group:
	pinctrl_generic_remove_group(pctldev, gsel);
done:
	*index = idx;
	kfree(configs);
	return ret;
}