mfd: syscon: Add platform data with a regmap config name

Define syscon platform data structure that can be used
to define a regmap config name. This is particularly useful
in the regmap debugfs when there is more than one syscon
device registered, to distinguish the register blocks.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/syscon.c

@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
+#include <linux/platform_data/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
@@ -119,6 +120,7 @@ static struct regmap_config syscon_regmap_config = {
 static int syscon_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct syscon_platform_data *pdata = dev_get_platdata(dev);
 	struct syscon *syscon;
 	struct resource *res;
 	void __iomem *base;
@@ -136,6 +138,8 @@ static int syscon_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	syscon_regmap_config.max_register = res->end - res->start - 3;
+	if (pdata)
+		syscon_regmap_config.name = pdata->label;
 	syscon->regmap = devm_regmap_init_mmio(dev, base,
 					&syscon_regmap_config);
 	if (IS_ERR(syscon->regmap)) {

include/linux/platform_data/syscon.h

@@ -0,0 +1,8 @@
+#ifndef PLATFORM_DATA_SYSCON_H
+#define PLATFORM_DATA_SYSCON_H
+
+struct syscon_platform_data {
+	const char *label;
+};
+
+#endif