[PATCH RFC v3 15/35] of: fdt: Add of_flat_read_u32()
From: Alexandru Elisei <hidden>
Date: 2024-01-25 16:44:14
Also in:
kvmarm, linux-arch, linux-arm-kernel, linux-fsdevel, linux-mm, lkml
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
Add the function of_flat_read_u32() to return the value of a property as an u32. Signed-off-by: Alexandru Elisei <redacted> --- Changes since rfc v2: * New patch, suggested by Rob Herring. drivers/of/fdt.c | 21 +++++++++++++++++++++ include/linux/of_fdt.h | 2 ++ 2 files changed, 23 insertions(+)
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index bf502ba8da95..dfcd79fd5fd9 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c@@ -755,6 +755,27 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, return fdt_getprop(initial_boot_params, node, name, size); } +/* + * of_flat_read_u32 - Return the value of the given property as an u32. + * + * @node: device node from which the property value is to be read + * @propname: name of the property + * @out_value: the value of the property + * @return: 0 on success, -EINVAL if property does not exist + */ +int __init of_flat_read_u32(unsigned long node, const char *propname, + u32 *out_value) +{ + const __be32 *reg; + + reg = of_get_flat_dt_prop(node, propname, NULL); + if (!reg) + return -EINVAL; + + *out_value = be32_to_cpup(reg); + return 0; +} + /** * of_fdt_is_compatible - Return true if given node from the given blob has * compat in its compatible list
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 0e26f8c3b10e..d7901699061b 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h@@ -57,6 +57,8 @@ extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, extern int of_flat_dt_is_compatible(unsigned long node, const char *name); extern unsigned long of_get_flat_dt_root(void); extern uint32_t of_get_flat_dt_phandle(unsigned long node); +extern int of_flat_read_u32(unsigned long node, const char *propname, + u32 *out_value); extern int early_init_dt_scan_chosen(char *cmdline); extern int early_init_dt_scan_memory(void);
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2.43.0