[PATCH v1 2/3] of: Add support for reading a s32 from a multi-value property.
From: Finlye Xiao <hidden>
Date: 2016-08-16 02:50:10
Also in:
linux-arm-kernel, linux-devicetree, linux-rockchip, lkml
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
From: Finley Xiao <redacted> This patch adds an of_property_read_s32_index() function to allow reading a single indexed s32 value from a property containing multiple s32 values. Signed-off-by: Finley Xiao <redacted> --- drivers/of/base.c | 23 +++++++++++++++++++++++ include/linux/of.h | 10 ++++++++++ 2 files changed, 33 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 7792266..346457d 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c@@ -1200,6 +1200,29 @@ int of_property_read_u32_index(const struct device_node *np, EXPORT_SYMBOL_GPL(of_property_read_u32_index); /** + * of_property_read_s32_index - Find and read a s32 from a multi-value property. + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the u32 in the list of values + * @out_value: pointer to return value, modified only if no error. + * + * Search for a property in a device node and read nth 32-bit value from + * it. Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + * + * The out_value is modified only if a valid s32 value can be decoded. + */ +int of_property_read_s32_index(const struct device_node *np, + const char *propname, u32 index, s32 *out_value) +{ + return of_property_read_u32_index(np, propname, index, + (u32 *)out_value); +} +EXPORT_SYMBOL_GPL(of_property_read_s32_index); + +/** * of_property_read_u8_array - Find and read an array of u8 from a property. * * @np: device node from which the property value is to be read.
diff --git a/include/linux/of.h b/include/linux/of.h
index 3d9ff8e..cb9a627 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h@@ -291,6 +291,9 @@ extern int of_property_count_elems_of_size(const struct device_node *np, extern int of_property_read_u32_index(const struct device_node *np, const char *propname, u32 index, u32 *out_value); +extern int of_property_read_s32_index(const struct device_node *np, + const char *propname, + u32 index, s32 *out_value); extern int of_property_read_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz); extern int of_property_read_u16_array(const struct device_node *np,
@@ -536,6 +539,13 @@ static inline int of_property_read_u32_index(const struct device_node *np, return -ENOSYS; } +static inline int of_property_read_s32_index(const struct device_node *np, + const char *propname, + u32 index, s32 *out_value) +{ + return -ENOSYS; +} + static inline int of_property_read_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz) {
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1.9.1