[PATCH 05/31] staging: wfx: explain uncommon Makefile statement

[Jerome Pouiller]

From: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>

I have got questions about this line from several reviewers. A comment
is definitively welcome.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
---
 drivers/staging/wfx/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/wfx/Makefile b/drivers/staging/wfx/Makefile
index 1e99e6ffe044..ae94c6552d77 100644
--- a/drivers/staging/wfx/Makefile
+++ b/drivers/staging/wfx/Makefile
@@ -20,6 +20,7 @@ wfx-y := \
 	sta.o \
 	debug.o
 wfx-$(CONFIG_SPI) += bus_spi.o
+# When CONFIG_MMC == m, append to 'wfx-y' (and not to 'wfx-m')
 wfx-$(subst m,y,$(CONFIG_MMC)) += bus_sdio.o
 
 obj-$(CONFIG_WFX) += wfx.o
-- 
2.34.1