[linux-6.6.y] i2c: smbus: Add support for Zhaoxin SMBUS controller

[leoliu-oc]

zhaoxin inclusion
category: feature

---

The Zhaoxin platform implements the SMBUS controller on the hardware, enabling information exchange and collaboration between devices using the SMBus protocol.

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[deepin-ci-robot]

Hi @leoliu-oc. Thanks for your PR.

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[opsiff]

非X86的话也需要 default m么?

[leoliu-oc]

新版中添加了对CPU_SUP_CENTAUR/CPU_SUP_ZHAOXIN的依赖。以保证只有在兆芯平台上，才会编译为module。

[opsiff]

/ok-to-test

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在zxsmb_transaction函数中，zxsmb_status_check函数的返回值没有被正确处理，可能会导致无限循环或错误。
• zxsmb_wait_interrput_finish和zxsmb_wait_polling_finish函数中使用了wait_for_completion_timeout，但没有处理可能的超时情况。
• zxsmb_trans_start函数中，outb(tmp, base + ZXSMB_CTL);可能会导致无限循环，因为ZXSMB_START和ZXSMB_PEC_EN位被同时设置。
• zxsmb_probe函数中，devm_request_irq的第二个参数应该是IRQF_SHARED，而不是IRQF_TRIGGERED。
• zxsmb_probe和zxsmb_remove函数中，devm_kfree应该在i2c_del_adapter之后调用。
• zxsmb_smbus_xfer函数中，处理I2C_SMBUS_BLOCK_DATA和I2C_SMBUS_I2C_BLOCK_DATA的情况时，应该检查data->block[0]是否大于I2C_SMBUS_BLOCK_MAX，以避免潜在的越界问题。

是否建议立即修改:
是