Hi Andrew,

I will add the following change on the next patch:

1. Add `privilege_ctrl` and `privilege_init` callback
2. Use `bool aspeed_gpio_support_copro()` api to replace the `cmd_source_supoort` flag
3. Add the `dcache_require` flag and move the dcache usage into the `reg_bit_set` callback
4. `reg_bits_set` -> `reg_bit_set` and `reg_bits_read` -> `reg_bits_get`
5. `bool copro = 0` -> `bool copro = false`
6. if (!gpio->config->llops->reg_bit_set || !gpio->config->llops->reg_bits_get) return -EINVAL;

Thanks for your comments.