Re: [PATCH v2 4/4] clk: mediatek: Add drivers for MediaTek MT6735 main clock drivers

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On Fri, May 20 2022 at 12:26:25 +0200, AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:
Il 20/05/22 11:35, Miles Chen ha scritto:


Thanks for submitting this patch.

I compare this with drivers/clk/mediatek/clk-mt7986-apmixed.c,
and other clk files are using macros to make the mtk_pll_data array
more readable.

I'd actually argue that macros make it less readable. While reading
other drivers I had a lot of trouble figuring out which argument
is which field of the struct, and had to constantly go back to the
macro definitions and count arguments to find it. Having it this
way, each value is labeled clearly with the field it's in. I think
the tradeoff between line count and readability here is worth it.

It is easier for multiple developers to work together if we have a common style.

How do you think?


In my opinion, Yassine is definitely right about this one: unrolling these macros will make the code more readable, even though this has the side effect of making it bigger in the source code form (obviously, when compiled, it's going to be the
exact same size).

I wouldn't mind getting this clock driver in without the usage of macros, as much as I wouldn't mind converting all of the existing drivers to open-code everything instead of using macros that you have to find in various headers... this practice was done in multiple drivers (clock or elsewhere), so I don't think that it would actually be a bad idea to do it here on MediaTek too, even though I'm not aware of any *rule* that may want us to do that: if you check across drivers/clk/*, there's a big split in how drivers are made, where some are using macros (davinci, renesas, samsung, sprd, etc), and some are not (bcm, sunxi-ng, qcom, tegra, versatile, etc),
so it's really "do it as you wish"...

... *but:*

Apart from that, I also don't think that it is a good idea to convert the other MTK clock drivers right now, as this would make the upstreaming of MediaTek clock drivers harder for some of the community in this moment... especially when we look at how many MTK SoCs are out there in the wild, and how many we have upstream:
something like 10% of them, or less.

I see the huge benefit of having a bigger community around MediaTek platforms as that's beneficial to get a way better support and solidity for all SoCs as they are sharing the same drivers and same framework, and expanding the support to more of them will only make it better with highly valuable community contributions.


That said, Yassine, you should've understood that you have my full support on unrolling these macros - but it's not time to do that yet: you definitely know that MediaTek clock drivers are going through a big cleanup phase which is, at this point, unavoidable... if we are able to get the aid of scripts (cocci and others), that will make our life easier in this cleanup, and will also make us able to perform the entire cleanup with less effort and in less overall time.

With that, I'm sad but I have to support Miles' decision on this one, and I also
have to ask you to use macros in this driver.


I am sure - and it is my wish - to see MediaTek clock drivers open-coding stuff instead of using macros, but that's something for the future - which will happen
after the more important cleanups.

After all, it will be just about running "gcc -E xxxx.c" and copy-pasting the unrolled macros to the clock drivers, which will be pretty fast and straightforward.

Sorry for the wall of text, by the way.

Cheers,
Angelo

Fair enough. I'll switch to macros in the next version.

Thanks,
Yassine





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