[PATCH v2 1/3] lib: utils/fdt: introduce fdt_node_is_enabled()

[Xiang W]

在 2022-05-09星期一的 15:55 +0200，Jan Remeš写道：
> If an FDT node contains a "status" property and this property is not
> "ok" or "okay", this node should be ignored. Introduce a function that
> checks this.
> 
> Signed-off-by: Jan Remes <jan.remes at codasip.com>
Look good to me

Reviewed-by: Xiang W <wxjstz at 126.com>
> ---
>  include/sbi_utils/fdt/fdt_helper.h |  2 ++
>  lib/utils/fdt/fdt_helper.c         | 18 ++++++++++++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/include/sbi_utils/fdt/fdt_helper.h
> b/include/sbi_utils/fdt/fdt_helper.h
> index 2279f96..a9c0a8a 100644
> --- a/include/sbi_utils/fdt/fdt_helper.h
> +++ b/include/sbi_utils/fdt/fdt_helper.h
> @@ -48,6 +48,8 @@ int fdt_parse_phandle_with_args(void *fdt, int nodeoff,
>  int fdt_get_node_addr_size(void *fdt, int node, int index,
>                 uint64_t *addr, uint64_t *size);
> 
> +bool fdt_node_is_enabled(void *fdt, int nodeoff);
> +
>  int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid);
> 
>  int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid);
> diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c
> index 9a35969..3b45ae8 100644
> --- a/lib/utils/fdt/fdt_helper.c
> +++ b/lib/utils/fdt/fdt_helper.c
> @@ -216,6 +216,24 @@ int fdt_get_node_addr_size(void *fdt, int node, int index,
>      return 0;
>  }
> 
> +bool fdt_node_is_enabled(void *fdt, int nodeoff)
> +{
> +    int len;
> +    const void *prop;
> +
> +    prop = fdt_getprop(fdt, nodeoff, "status", &len);
> +    if (!prop)
> +        return true;
> +
> +    if (!strncmp(prop, "okay", strlen("okay")))
> +        return true;
> +
> +    if (!strncmp(prop, "ok", strlen("ok")))
> +        return true;
> +
> +    return false;
> +}
> +
>  int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid)
>  {
>      int len;
> -- 
> 2.35.1
>