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[dm][nvmem] fixup the DT parse for bits #11648

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[dm][nvmem] fixup the DT parse for bits #11648

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17 changes: 15 additions & 2 deletions components/drivers/nvmem/nvmem.c
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Original file line number Diff line number Diff line change
Expand Up @@ -417,11 +417,24 @@ static struct rt_nvmem_cell *ofw_nvmem_get_cell(struct rt_ofw_node *np,
cell->offset = fdt32_to_cpu(*addr++);
cell->bytes = fdt32_to_cpu(*addr);

addr = rt_ofw_prop_read_raw(cell_np, "reg", &length);
if (addr && length == 2 * sizeof(rt_uint32_t))
addr = rt_ofw_prop_read_raw(cell_np, "bits", &length);
if (addr)
{
if (length != 2 * sizeof(rt_uint32_t))
{
LOG_E("%s Invalid bits", rt_ofw_node_full_name(cell_np));
goto _fail;
}

cell->bit_offset = fdt32_to_cpu(*addr++);
cell->nbits = fdt32_to_cpu(*addr);

if (cell->bit_offset >= RT_BITS_PER_BYTE || !cell->nbits ||
cell->nbits > cell->bytes * RT_BITS_PER_BYTE - cell->bit_offset)
{
LOG_E("%s Bits out of range", rt_ofw_node_full_name(cell_np));
goto _fail;
}
}

/* user ref is '1' */
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