On 02/06/2012 10:13 PM, Jean-Christophe PLAGNIOL-VILLARD wrote: > of_property_read_bool > > Search for a property in a device node and read a 32-bit value from > it. Returns 0 if <0> or if the property does not exist, 1 if <1> or none. > > this will allow to disable a boolean > > is-ok; => true > is-ok = <1>; => true > is-ok = <0>; => false > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[email protected]> > Cc: [email protected]
Acked-by: Rob Herring <[email protected]> > --- > Hi, > > if this is ok I'll rebase my mtd and i2c patch to use it > I'm assuming you'll want to merge this patch with your mtd and i2c patches. If you want me to apply, let me know. Rob > Best Regards, > J. > drivers/of/base.c | 30 ++++++++++++++++++++++++++++++ > include/linux/of.h | 8 ++++++++ > 2 files changed, 38 insertions(+), 0 deletions(-) > > diff --git a/drivers/of/base.c b/drivers/of/base.c > index 133908a..a0eaf08 100644 > --- a/drivers/of/base.c > +++ b/drivers/of/base.c > @@ -686,6 +686,36 @@ int of_property_read_u64(const struct device_node *np, > const char *propname, > EXPORT_SYMBOL_GPL(of_property_read_u64); > > /** > + * of_property_read_bool - Find and read a boolean from a property > + * @np: device node from which the property value is to be read. > + * @propname: name of the property to be searched. > + * > + * Search for a property in a device node and read a 32-bit value from > + * it. Returns 0 if <0> or if the property does not exist, 1 if <1> or none. > + * > + * is-ok; => true > + * is-ok = <1>; => true > + * is-ok = <0>; => false > + */ > +int of_property_read_bool(const struct device_node *np, const char *propname) > +{ > + u32 reg; > + int ret = of_property_read_u32(np, propname, ®); > + > + switch (ret) { > + case -EINVAL: > + return false; > + case -ENODATA: > + return true; > + case 0: > + return reg == 1; > + default: > + return ret; > + } > +} > +EXPORT_SYMBOL_GPL(of_property_read_bool); > + > +/** > * of_property_read_string - Find and read a string from a property > * @np: device node from which the property value is to be read. > * @propname: name of the property to be searched. > diff --git a/include/linux/of.h b/include/linux/of.h > index a75a831..2e5f77b 100644 > --- a/include/linux/of.h > +++ b/include/linux/of.h > @@ -210,6 +210,8 @@ extern int of_property_read_u32_array(const struct > device_node *np, > size_t sz); > extern int of_property_read_u64(const struct device_node *np, > const char *propname, u64 *out_value); > +extern int of_property_read_bool(const struct device_node *np, > + const char *propname); > > extern int of_property_read_string(struct device_node *np, > const char *propname, > @@ -288,6 +290,12 @@ static inline int of_property_read_u32_array(const > struct device_node *np, > return -ENOSYS; > } > > +static inline int of_property_read_bool(const struct device_node *np, > + const char *propname) > +{ > + return -ENOSYS; > +} > + > static inline int of_property_read_string(struct device_node *np, > const char *propname, > const char **out_string) _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
