Re: [PATCH v2 4/6] clk: hi6220: Clock driver support for Hisilicon hi6220 SoC

[Bintian]

Hello Paul,

Thank you very much for code review and testing on arm!

On 2015/4/13 19:56, Paul Bolle wrote:
> On Mon, 2015-04-13 at 17:17 +0800, Bintian Wang wrote:
> > --- /dev/null
> > +++ b/drivers/clk/hisilicon/Kconfig
> > @@ -0,0 +1,5 @@
> > +config COMMON_CLK_HI6220
> > +	tristate "Hi6220 Clock Driver"
> > +	depends on OF && ARCH_HISI
> > +	help
> > +	  Build the Hisilicon Hi6220 clock driver based on the common clock framework.
>
> In 5/6 you make arm64's ARCH_HISI (a bool) select COMMON_CLK_HI6220. So
> for arm64 this driver will always be built-in.
>
> For arm's ARCH_HISI it's possible to set COMMON_CLK_HI6220 to 'm'.

Setting COMMON_CLK_HI6220 to a bool symbol is a good solution based on
current code base, I will fix it in next version.

> > --- a/drivers/clk/hisilicon/Makefile
> > +++ b/drivers/clk/hisilicon/Makefile
> > @@ -2,8 +2,9 @@
> >   # Hisilicon Clock specific Makefile
> >   #
> >
> > -obj-y	+= clk.o clkgate-separated.o
> > +obj-y	+= clk.o clkgate-separated.o clkdivider-hi6220.o
>
> These objects will always be built-in, right?
>
> >   obj-$(CONFIG_ARCH_HI3xxx)	+= clk-hi3620.o
> >   obj-$(CONFIG_ARCH_HIP04)	+= clk-hip04.o
> >   obj-$(CONFIG_ARCH_HIX5HD2)	+= clk-hix5hd2.o
> > +obj-$(CONFIG_COMMON_CLK_HI6220)	+= clk-hi6220.o
>
> If CONFIG_COMMON_CLK_HI6220 is 'm' this will build a module named
> clk-hi6220.ko. If I try to do that I get:
>      $ make -C ../../.. ARCH=arm CROSS_COMPILE=arm-linux-gnu- M=$PWD clk-hi6220.ko
>      make: Entering directory `[...]'
>        CC [M]  [...]/drivers/clk/hisilicon/clk-hi6220.o
>        MODPOST 1 modules
>      WARNING: "hisi_clk_register_gate" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>      WARNING: "hi6220_clk_register_divider" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>      WARNING: "hisi_clk_register_mux" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>      WARNING: "hisi_clk_register_gate_sep" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>      WARNING: "hisi_clk_register_fixed_factor" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>      WARNING: "hisi_clk_register_fixed_rate" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>      WARNING: "hisi_clk_init" [[...]/drivers/clk/hisilicon/clk-hi6220.ko] undefined!
>        CC      [...]/drivers/clk/hisilicon/clk-hi6220.mod.o
>        LDFINAL [M]  [...]/drivers/clk/hisilicon/clk-hi6220.ko
>      make: Leaving directory `[...]'
>
> That is, I think, because nothing exports these symbols.

[...]

> There's nothing module specific in this file. And the lack of a
> MODULE_LICENSE() macro is also telling. If this was built as a module
> loading that module - ignoring the undefined symbols - would taint the
> kernel.
>
> It seems to me that COMMON_CLK_HI6220 is meant to be a bool symbol.
You are right.

> Paul Bolle
>
> I wonder what checkpatch had to say about the length of the lines seen
> in this patch.

Yes, I ran this script before sending out this patch set, it reports
warnings about "line over 80 characters ", but I find it's easier to
read than shrinking one line to several lines, so just keep it, do I
need to fix it?

Thanks,

Bintian

> .

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