From fa12dfa08a7bdc7d67e3758f10461468a663ce2e Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Fri, 25 Aug 2023 11:37:46 +0200 Subject: dm: core: support reading a single indexed u64 value Add helper function to allow reading a single indexed u64 value from a device-tree property containing multiple u64 values, that is an array of u64's. Co-developed-by: Ashok Reddy Soma Signed-off-by: Ashok Reddy Soma Reviewed-by: Simon Glass Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/08043c8d204d0068f04c27de86afe78c75c50b69.1692956263.git.michal.simek@amd.com --- include/dm/of_access.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'include/dm/of_access.h') diff --git a/include/dm/of_access.h b/include/dm/of_access.h index c556a18f7d9..9361d0a87bf 100644 --- a/include/dm/of_access.h +++ b/include/dm/of_access.h @@ -333,6 +333,25 @@ int of_read_u32(const struct device_node *np, const char *propname, u32 *outp); int of_read_u32_index(const struct device_node *np, const char *propname, int index, u32 *outp); +/** + * of_read_u64_index() - Find and read a 64-bit value 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 + * @outp: pointer to return value, modified only if return value is 0. + * + * Search for a property in a device node and read a 64-bit value from + * it. + * + * Return: + * 0 on success, -EINVAL if the property does not exist, or -EOVERFLOW if the + * property data isn't large enough. + */ +int of_read_u64_index(const struct device_node *np, const char *propname, + int index, u64 *outp); + /** * of_read_u64() - Find and read a 64-bit integer from a property * -- cgit v1.2.3