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mfd: syscon: Set regmap max_register in of_syscon_register

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Determine the regmap max_register configuration from the io resource size
and the reg-io-width device tree property.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Philipp Zabel 2016-01-29 10:35:51 +01:00 committed by Lee Jones
parent a7e4631772
commit ca668f0edf
1 changed files with 8 additions and 1 deletions
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9
drivers/mfd/syscon.c
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@ -50,6 +50,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
u32 reg_io_width;
int ret;
struct regmap_config syscon_config = syscon_regmap_config;
struct resource res;
if (!of_device_is_compatible(np, "syscon"))
return ERR_PTR(-EINVAL);
@ -58,7 +59,12 @@ static struct syscon *of_syscon_register(struct device_node *np)
if (!syscon)
return ERR_PTR(-ENOMEM);
base = of_iomap(np, 0);
if (of_address_to_resource(np, 0, &res)) {
ret = -ENOMEM;
goto err_map;
}
base = ioremap(res.start, resource_size(&res));
if (!base) {
ret = -ENOMEM;
goto err_map;
@ -81,6 +87,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
syscon_config.reg_stride = reg_io_width;
syscon_config.val_bits = reg_io_width * 8;
syscon_config.max_register = resource_size(&res) - reg_io_width;
regmap = regmap_init_mmio(NULL, base, &syscon_config);
if (IS_ERR(regmap)) {