bus: uniphier-system-bus: Remove open coded "ranges" parsing

"ranges" is a standard property and we have common helper functions for
parsing it, so let's use them.

Tested-by: Kunihiko Hayashi <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

drivers/bus/uniphier-system-bus.c

···
 {
 	struct device *dev = &pdev->dev;
 	struct uniphier_system_bus_priv *priv;
-	const __be32 *ranges;
-	u32 cells, addr, size;
-	u64 paddr;
-	int pna, bank, rlen, rone, ret;
+	struct of_range_parser parser;
+	struct of_range range;
+	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
···
 
 	priv->dev = dev;
 
-	pna = of_n_addr_cells(dev->of_node);
-
-	ret = of_property_read_u32(dev->of_node, "#address-cells", &cells);
-	if (ret) {
-		dev_err(dev, "failed to get #address-cells\n");
+	ret = of_range_parser_init(&parser, dev->of_node);
+	if (ret)
 		return ret;
-	}
-	if (cells != 2) {
-		dev_err(dev, "#address-cells must be 2\n");
-		return -EINVAL;
-	}
 
-	ret = of_property_read_u32(dev->of_node, "#size-cells", &cells);
-	if (ret) {
-		dev_err(dev, "failed to get #size-cells\n");
-		return ret;
-	}
-	if (cells != 1) {
-		dev_err(dev, "#size-cells must be 1\n");
-		return -EINVAL;
-	}
-
-	ranges = of_get_property(dev->of_node, "ranges", &rlen);
-	if (!ranges) {
-		dev_err(dev, "failed to get ranges property\n");
-		return -ENOENT;
-	}
-
-	rlen /= sizeof(*ranges);
-	rone = pna + 2;
-
-	for (; rlen >= rone; rlen -= rone) {
-		bank = be32_to_cpup(ranges++);
-		addr = be32_to_cpup(ranges++);
-		paddr = of_translate_address(dev->of_node, ranges);
-		if (paddr == OF_BAD_ADDR)
+	for_each_of_range(&parser, &range) {
+		if (range.cpu_addr == OF_BAD_ADDR)
 			return -EINVAL;
-		ranges += pna;
-		size = be32_to_cpup(ranges++);
-
-		ret = uniphier_system_bus_add_bank(priv, bank, addr,
-						   paddr, size);
+		ret = uniphier_system_bus_add_bank(priv,
+						   upper_32_bits(range.bus_addr),
+						   lower_32_bits(range.bus_addr),
+						   range.cpu_addr, range.size);
 		if (ret)
 			return ret;
 	}