Function ofw_parse_phandle_cells

components/drivers/ofw/base.c:1473–1547

}

static rt_err_t ofw_parse_phandle_cells(const struct rt_ofw_node *np, const char *list_name, const char *cells_name,
        int index, struct rt_ofw_cell_args *out_args)
{
    rt_err_t err = -RT_EEMPTY;
    rt_uint32_t value;
    rt_size_t count = 0;
    const fdt32_t *cell;
    struct rt_ofw_prop *prop;

    /*
     * List:
     *
     *      phandle1: node1 {
     *          #list-cells = <2>;
     *      };
     *
     *      phandle2: node2 {
     *          #list-cells = <1>;
     *      };
     *
     *      node3 {
     *          list = <&phandle1 0xaa 0xbb>, <&phandle2 0xcc>;
     *      };
     *
     * if call:
     *  rt_ofw_parse_phandle_cells(node3, "list", "#list-cells", 0, &args):
     *
     *      args.data = node1;
     *      args.args_count = 2;
     *      args.args[0] = 0xaa;
     *      args.args[1] = 0xbb;
     *
     *  rt_ofw_parse_phandle_cells(node3, "list", "#list-cells", 1, &args):
     *
     *      args.data = node2;
     *      args.args_count = 1;
     *      args.args[0] = 0xcc;
     */

    rt_ofw_foreach_prop_u32(np, list_name, prop, cell, value)
    {
        rt_uint32_t cells_count = 0;
        struct rt_ofw_node *phandle_np = rt_ofw_find_node_by_phandle((rt_phandle)value);

        /* if phandle node is undefined, we assume that the cels_count is 0 */
        if (cells_name && phandle_np)
        {
            rt_ofw_prop_read_u32(phandle_np, cells_name, &cells_count);
        }

        if (count++ == index)
        {
            for (int idx = 0; idx < cells_count; ++idx)
            {
                cell = rt_ofw_prop_next_u32(prop, cell, &value);

                out_args->args[idx] = value;
            }