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device_tree: qemu_fdt_getprop_cell converted to use the error API

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This patch aligns the prototype with qemu_fdt_getprop. The caller
can choose whether the function self-asserts on error (passing
&error_fatal as Error ** argument, corresponding to the legacy behavior),
or behaves differently such as simply output a message.

In this later case the caller can use the new lenp parameter to interpret
the error if any.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2016-02-19 09:42:30 -07:00 • committed by Alex Williamson
parent 78e24f235e
commit 58e71097ce
4 changed files with 35 additions and 12 deletions
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14
include/sysemu/device_tree.h
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@ -67,8 +67,20 @@ int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
const void *qemu_fdt_getprop(void *fdt, const char *node_path,
const char *property, int *lenp,
Error **errp);
/**
* qemu_fdt_getprop_cell: retrieve the value of a given 4 byte property
* @fdt: pointer to the device tree blob
* @node_path: node path
* @property: name of the property to find
* @lenp: fdt error if any or -EINVAL if the property size is different from
* 4 bytes, or 4 (expected length of the property) upon success.
* @errp: handle to an error object
*
* returns the property value on success
*/
uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
const char *property);
const char *property, int *lenp,
Error **errp);
uint32_t qemu_fdt_get_phandle(void *fdt, const char *path);
uint32_t qemu_fdt_alloc_phandle(void *fdt);
int qemu_fdt_nop_node(void *fdt, const char *node_path);