AMD_STB_PMI_0
err = amd_smn_write(0, AMD_STB_PMI_0, data);
dev_err(dev->dev, "failed to write data in stb: 0x%X\n", AMD_STB_PMI_0);
err = amd_smn_read(0, AMD_STB_PMI_0, buf++);
dev_err(dev->dev, "error reading data from stb: 0x%X\n", AMD_STB_PMI_0);