[PATCH] video: exynos: fix modular build
pebolle at tiscali.nl
Wed May 20 00:05:40 PDT 2015
On Tue, 2015-05-19 at 14:17 +0200, Arnd Bergmann wrote:
> Finally, the EXYNOS_VIDEO option is turned into tristate as well
> for good measure, as all framebuffer drivers should be configurable
> as modules.
EXYNOS_MIPI_DSI and EXYNOS_LCD_S6E8AX0 are made tristate too. And that
is, I think, what counts. See below.
For anyone wondering how these two drivers can be made modular with only
a few tweaks to the build system: that is because exynos_mipi_dsi.c and
s6e8ax0.c already contain module specific boilerplate. They probably
already contained that boilerplate when they were added three years ago.
(Perhaps the changelog should mention this.)
> --- a/drivers/video/fbdev/exynos/Kconfig
> +++ b/drivers/video/fbdev/exynos/Kconfig
> menuconfig EXYNOS_VIDEO
> - bool "Exynos Video driver support"
> + tristate "Exynos Video driver support"
> depends on ARCH_S5PV210 || ARCH_EXYNOS
> This enables support for EXYNOS Video device.
I have tested this only lightly but I do think this hunk is not needed.
Because basically all that this entry does is making EXYNOS_MIPI_DSI and
EXYNOS_LCD_S6E8AX0 available. And that works just as well if it's a
> config EXYNOS_MIPI_DSI
> - bool "EXYNOS MIPI DSI driver support."
> + tristate "EXYNOS MIPI DSI driver support."
> select GENERIC_PHY
> This enables support for MIPI-DSI device.
> config EXYNOS_LCD_S6E8AX0
> - bool "S6E8AX0 MIPI AMOLED LCD Driver"
> + tristate "S6E8AX0 MIPI AMOLED LCD Driver"
> depends on EXYNOS_MIPI_DSI && BACKLIGHT_CLASS_DEVICE
> depends on (LCD_CLASS_DEVICE = y)
> default n
> --- a/drivers/video/fbdev/exynos/Makefile
> +++ b/drivers/video/fbdev/exynos/Makefile
> -obj-$(CONFIG_EXYNOS_MIPI_DSI) += exynos_mipi_dsi.o exynos_mipi_dsi_common.o \
> - exynos_mipi_dsi_lowlevel.o
> +obj-$(CONFIG_EXYNOS_MIPI_DSI) += exynos-mipi-dsi-mod.o
> +exynos-mipi-dsi-mod-objs += exynos_mipi_dsi.o exynos_mipi_dsi_common.o \
> + exynos_mipi_dsi_lowlevel.o
I don't speak Makefilese fluently, so I have to ask. Is the -mod
extension needed because a module built from multiple files can't have a
name that matches the name of one of its .c files (minus the .c
extension, of course)?
> obj-$(CONFIG_EXYNOS_LCD_S6E8AX0) += s6e8ax0.o
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