pinctrl: rockchip: base regmap supplied by a syscon

This allows the basic registers of the general register files to be supplied
by a syscon instead of being mapped locally.

The GRF registers contain a lot more than pinctrl functions like dma, usb-phy
and general soc control and status registers, intermixed with the iomux, pull
and drive-strength registers.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Max Schwarz <max.schwarz@online.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-rockchip.c

@@ -1574,6 +1574,12 @@ static int rockchip_pinctrl_probe(struct platform_device *pdev)
 	}
 	info->ctrl = ctrl;
 
+	node = of_parse_phandle(np, "rockchip,grf", 0);
+	if (node) {
+		info->regmap_base = syscon_node_to_regmap(node);
+		if (IS_ERR(info->regmap_base))
+			return PTR_ERR(info->regmap_base);
+	} else {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 		base = devm_ioremap_resource(&pdev->dev, res);
 		if (IS_ERR(base))
@@ -1594,11 +1600,14 @@ static int rockchip_pinctrl_probe(struct platform_device *pdev)
 			if (IS_ERR(base))
 				return PTR_ERR(base);
 
-		rockchip_regmap_config.max_register = resource_size(res) - 4;
+			rockchip_regmap_config.max_register =
+							resource_size(res) - 4;
 			rockchip_regmap_config.name = "rockchip,pinctrl-pull";
-		info->regmap_pull = devm_regmap_init_mmio(&pdev->dev, base,
+			info->regmap_pull = devm_regmap_init_mmio(&pdev->dev,
+						    base,
 						    &rockchip_regmap_config);
 		}
+	}
 
 	/* try to find the optional reference to the pmu syscon */
 	node = of_parse_phandle(np, "rockchip,pmu", 0);