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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /drivers/mfd/syscon.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'drivers/mfd/syscon.c')
-rw-r--r--drivers/mfd/syscon.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 176bf0fa2..b7aabeefa 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -47,6 +47,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
struct syscon *syscon;
struct regmap *regmap;
void __iomem *base;
+ u32 reg_io_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 reg-io-width property in DT. If it is not provided,
+ * default to 4 bytes. regmap_init_mmio will return an error if values
+ * are invalid so there is no need to check them here.
+ */
+ ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);
+ if (ret)
+ reg_io_width = 4;
+
+ syscon_config.reg_stride = reg_io_width;
+ syscon_config.val_bits = reg_io_width * 8;
+
regmap = regmap_init_mmio(NULL, base, &syscon_config);
if (IS_ERR(regmap)) {
pr_err("regmap init failed\n");