Phytium Random Number Generator support

[xuyan213]

This driver provides kernel-side support for the Random Number Generator hardware found on Phytium SoCs.

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关键摘要:

• 在phytium_rng_read函数中，使用readl_poll_timeout可能导致资源泄露，因为如果readl函数返回错误，DELAY和TIMEOUT参数将被忽略。
• phytium_rng_read函数中的max变量应该是size_t类型，以匹配readl函数的返回类型。
• phytium_rng_read函数中缺少对readl返回值的错误处理，可能会导致未检查的错误。
• phytium_rng_init和phytium_rng_cleanup函数中没有检查writel或readl是否成功，可能会导致未检查的错误。
• module_param宏的使用应该检查返回值是否为0，以确保模块参数的设置成功。
• dev_err函数在phytium_rng_read中被调用，但没有提供错误代码，不利于调试。

是否建议立即修改:
是