Input: Add a new serio driver for Phytium PCI PS/2 controller

[studyhu]

This driver supports Phytium PCI PS/2 controller.

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[opsiff]

/ok-to-test

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在phytium_ps2_irq函数中，scancode的赋值应该在if语句的内部，否则在rxcount为0时scancode会被赋值为0，这可能导致后续的flag赋值不正确。
• phytium_ps2_irq函数中的rxcount检查应该在循环外部，以确保在rxcount为0时能够正确地处理timeout interrupt。
• phytium_ps2_write函数中的cpu_relax()调用可能是多余的，因为writel函数在Linux中会自动同步。
• phytium_pci_ps2_probe函数中的ret变量在free分支中被赋值，但在out分支中没有被赋值，这可能导致未初始化的变量被使用。
• phytium_pci_ps2_probe函数中的serio_register_port调用应该在kzalloc成功后立即进行，以确保在内存分配失败时能够正确释放资源。
• phytium_pci_ps2_remove函数中的pcim_iounmap_regions调用应该在serio_unregister_port之后进行，以确保资源正确释放。

是否建议立即修改:
是