@@ -13,6 +13,9 @@ Required properties:
- compatible: Should contain "syscon".
- reg: the register region can be accessed from syscon
+Optional property:
+- bus-width: width of the data bus. Can be <8>, <16>, <32>, or <64>.
+
Examples:
gpr: iomuxc-gpr@020e0000 {
compatible = "fsl,imx6q-iomuxc-gpr", "syscon";
@@ -47,6 +47,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
struct syscon *syscon;
struct regmap *regmap;
void __iomem *base;
+ u32 bus_width;
int ret;
struct regmap_config syscon_config = syscon_regmap_config;
@@ -69,6 +70,18 @@ static struct syscon *of_syscon_register(struct device_node *np)
else if (of_property_read_bool(np, "little-endian"))
syscon_config.val_format_endian = REGMAP_ENDIAN_LITTLE;
+ /*
+ * search for bus-width property in DT. If it is not provided, default
+ * to 32-bit. regmap_init_mmio will return an error if syscon_config's
+ * values are invalid so there is no need to check them here.
+ */
+ ret = of_property_read_u32(np, "bus-width", &bus_width);
+ if (ret)
+ bus_width = 32;
+
+ syscon_config.val_bits = bus_width;
+ syscon_config.reg_stride = syscon_config.val_bits / 8;
+
regmap = regmap_init_mmio(NULL, base, &syscon_config);
if (IS_ERR(regmap)) {
pr_err("regmap init failed\n");