static bool _opp_is_supported()

in of.c [519:573]

• 39 lines of code
• 10 McCabe index (conditional complexity)

static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
			      struct device_node *np)
{
	unsigned int levels = opp_table->supported_hw_count;
	int count, versions, ret, i, j;
	u32 val;

	if (!opp_table->supported_hw) {
		/*
		 * In the case that no supported_hw has been set by the
		 * platform but there is an opp-supported-hw value set for
		 * an OPP then the OPP should not be enabled as there is
		 * no way to see if the hardware supports it.
		 */
		if (of_find_property(np, "opp-supported-hw", NULL))
			return false;
		else
			return true;
	}

	count = of_property_count_u32_elems(np, "opp-supported-hw");
	if (count <= 0 || count % levels) {
		dev_err(dev, "%s: Invalid opp-supported-hw property (%d)\n",
			__func__, count);
		return false;
	}

	versions = count / levels;

	/* All levels in at least one of the versions should match */
	for (i = 0; i < versions; i++) {
		bool supported = true;

		for (j = 0; j < levels; j++) {
			ret = of_property_read_u32_index(np, "opp-supported-hw",
							 i * levels + j, &val);
			if (ret) {
				dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
					 __func__, i * levels + j, ret);
				return false;
			}

			/* Check if the level is supported */
			if (!(val & opp_table->supported_hw[j])) {
				supported = false;
				break;
			}
		}

		if (supported)
			return true;
	}

	return false;
}