Re: [PATCH v2 36/47] clk: mediatek: mt2712: Change Kconfig options to allow module build

[Chen-Yu Tsai <wenst@chromium.org>]

On Fri, Feb 17, 2023 at 7:25 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> wrote:
>
> Il 17/02/23 05:24, Chen-Yu Tsai ha scritto:
> > On Tue, Feb 14, 2023 at 9:42 PM AngeloGioacchino Del Regno
> > <angelogioacchino.delregno@collabora.com> wrote:
> >>
> >> All of the mt2712 drivers have been converted to platform drivers!
> >> Change the Kconfig options for all MT2712 clocks to tristate to allow
> >> building all clock drivers as modules.
> >>
> >> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> >> ---
> >>   drivers/clk/mediatek/Kconfig | 16 ++++++++--------
> >>   1 file changed, 8 insertions(+), 8 deletions(-)
> >>
> >> diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
> >> index b9c0a9e21cf1..45b7aea7648d 100644
> >> --- a/drivers/clk/mediatek/Kconfig
> >> +++ b/drivers/clk/mediatek/Kconfig
> >> @@ -75,7 +75,7 @@ config COMMON_CLK_MT2701_G3DSYS
> >>            This driver supports MediaTek MT2701 g3dsys clocks.
> >>
> >>   config COMMON_CLK_MT2712
> >> -       bool "Clock driver for MediaTek MT2712"
> >> +       tristate "Clock driver for MediaTek MT2712"
> >
> > Hmm... How does that work out if mt2712-apmixedsys is a
> > builtin_platform_driver?
> >
> > ChenYu
>
> That doesn't. Thanks for catching that, I've added a .remove() callback
> and changed it to module_platform_driver() for v3!

Actually, I thought that if it were built as a module, then the
builtin_platform_driver would then expand to a module_init() without
module_exit(). So it would become a loadable module that cannot be
unloaded.

That was just looking at the header files, so I could be mistaken.

Side note: IIRC a missing .remove() driver callback doesn't actually
block driver removal or unbinding.

ChenYu