linux-kernel - Re: [PATCH v14] i2c: virtio: add a virtio i2c frontend driver

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Date:   Fri, 23 Jul 2021 10:21:53 +0800
From:   Jie Deng <jie.deng@...el.com>
To:     Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, arnd@...db.de,
        jasowang@...hat.com, andriy.shevchenko@...ux.intel.com,
        yu1.wang@...el.com, shuo.a.liu@...el.com, conghui.chen@...el.com,
        viresh.kumar@...aro.org, stefanha@...hat.com,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v14] i2c: virtio: add a virtio i2c frontend driver

On 2021/7/22 23:35, Wolfram Sang wrote:

> Hi,
>
> so only minor stuff left from my side.
>
>> @@ -21,6 +21,17 @@ config I2C_ALI1535
>>   	  This driver can also be built as a module.  If so, the module
>>   	  will be called i2c-ali1535.
>>   
>> +config I2C_VIRTIO
>> +	tristate "Virtio I2C Adapter"
>> +	select VIRTIO
>> +	help
>> +	  If you say yes to this option, support will be included for the virtio
>> +	  I2C adapter driver. The hardware can be emulated by any device model
>> +	  software according to the virtio protocol.
>> +
>> +	  This driver can also be built as a module. If so, the module
>> +	  will be called i2c-virtio.
>> +
>>   config I2C_ALI1563
>>   	tristate "ALI 1563"
>>   	depends on PCI
> The sorting is not good. I think your entry should go to the bottom of
> the Kconfig file.


OK. I will move it to the bottom.


>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 69e9963..9843756 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -147,4 +147,7 @@ obj-$(CONFIG_I2C_XGENE_SLIMPRO) += i2c-xgene-slimpro.o
>>   obj-$(CONFIG_SCx200_ACB)	+= scx200_acb.o
>>   obj-$(CONFIG_I2C_FSI)		+= i2c-fsi.o
>>   
>> +# VIRTIO I2C host controller driver
> This comment can go, I'd say.


I will remove this line. Thank you.


>
>> +obj-$(CONFIG_I2C_VIRTIO)	+= i2c-virtio.o
>> +
>>   ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
>
>> +		/*
>> +		 * We don't support 0 length messages and so masked out
>> +		 * I2C_FUNC_SMBUS_QUICK in virtio_i2c_func().
>> +		 */
>> +		if (!msgs[i].len)
>> +			break;
> I recommend using struct i2c_adapter_quirks with I2C_AQ_NO_ZERO_LEN. But
> let's wait first if zero length are possible or not.


I think we can add an i2c_adapter_quirks for this moment. Support for 
I2C_FUNC_SMBUS_QUICK
can be added incrementally if needed.


>
> Also, checkpatch:
>
> WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
>
> So, is one of you interested in maintaining this driver?
>
> All the best,
>
>     Wolfram


I will play this role. I see Viresh also spend a lot of time on this driver.

So I'd like to ask Viresh, are you willing to be a co-maintainer ?

Regards,
Jie