Re: [PATCH 2/3] spi: spacemit: introduce SpacemiT K1 SPI controller driver

[Alex Elder <elder@riscstar.com>]

On 9/18/25 9:39 AM, Yixun Lan wrote:
>>>> +	virt = drv_data->ioaddr + SSP_TOP_CTRL;
>>>> +	val = readl(virt);
>>>> +	val |= TOP_TRAIL;	/* Trailing bytes handled by DMA */
>>>> +	writel(val, virt);
>>> I'd prefer to do like this, it's more easy for people to grep..
>>> 	val = readl(drv_data->ioaddr + SSP_TOP_CTRL) | TOP_TRAIL;
>>> 	writel(val, drv_data->ioaddr + SSP_TOP_CTRL);
>> This is an idiom I use to make it very clear that:
>> - The address being read is exactly the same as what's being
>>     written
>> - The value read is being updated with bits/values
>>
>> I find that putting the "| TOP_TRAIL" on the same line as the
>> readl() call obscures things a bit.  Like my eye doesn't notice
>> it as readiliy somehow...
> fair, let's put it into another line
> 
>> Yours is a pure coding style comment.  There are two pieces, and
>> I'd like you to tell me how strongly you feel about them:
>> - Using virt to grab the address being written and read (versus
>>     just using drv_data->ioaddr + SSP_TOP_CTRL twice)
>> - Put the "| TOP_TRAIL" on the same line as the readl() (versus
>>     having that be assigned on a separate line).
>> To me, the second one is more important than the first.
>>
>> Let me know how strongly you feel about these and I'll update
>> my convention througout.
>>
> I'd strongly prefer not to introduce 'virt', so be something like this:
>   	val = readl(drv_data->ioaddr + SSP_TOP_CTRL);
>   	val |= TOP_TRAIL;
>   	writel(val, drv_data->ioaddr + SSP_TOP_CTRL);
> 

OK.  I'll do it this way throughout the driver in the
next version.

					-Alex