[U-Boot] listing apparently "bad" Kconfig options in Makefiles

[Robert P. J. Day]

  as a final(?) example of one of my originally Linux kernel-related
Kbuild cleanup scripts, i have one that identifies Makefile entries
that refer to Kbuild options that are not defined in any Kconfig file
(IIRC, they might be defined manually in a defconfig file, i'll have
to refresh my memory, but tradition suggests that "CONFIG_"-prefixed
variables are meant to be defined in Kconfig files).

  i ran this script on the entire u-boot code base, and posted the
results here (not overly long):

  https://crashcourse.ca/dokuwiki/doku.php?id=u-boot_make_badref

so let me elaborate with a couple examples.

  first, there's this output:

  >>>>> NATSEMI
  ./drivers/net/Makefile:obj-$(CONFIG_NATSEMI) += natsemi.o

so what's the story with CONFIG_NATSEMI? first, it clearly is not
defined in a Kconfig file anywhere:

$ git grep "config NATSEMI"
$

  so where does it occur?

$ git grep CONFIG_NATSEMI
README:         CONFIG_NATSEMI
drivers/net/Makefile:obj-$(CONFIG_NATSEMI) += natsemi.o
include/netdev.h:#ifdef CONFIG_NATSEMI
scripts/config_whitelist.txt:CONFIG_NATSEMI
$

pretty clearly(?), it's documented and tested and whitelisted, while
never being defined anywhere. a wild guess suggests it really should
say CONFIG_PHY_NATSEMI:

$ git grep CONFIG_PHY_NATSEMI
configs/brppt1_mmc_defconfig:CONFIG_PHY_NATSEMI=y
configs/brppt1_nand_defconfig:CONFIG_PHY_NATSEMI=y
configs/brppt1_spi_defconfig:CONFIG_PHY_NATSEMI=y
configs/microblaze-generic_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_versal_virt_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zc1751_xm015_dc1_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zc1751_xm017_dc3_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zc1751_xm018_dc4_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zc1751_xm019_dc5_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu102_rev1_0_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu102_revA_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu102_revB_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu104_revA_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu104_revC_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu106_revA_defconfig:CONFIG_PHY_NATSEMI=y
configs/xilinx_zynqmp_zcu111_revA_defconfig:CONFIG_PHY_NATSEMI=y
drivers/net/phy/Makefile:obj-$(CONFIG_PHY_NATSEMI) += natsemi.o
drivers/net/phy/phy.c:#ifdef CONFIG_PHY_NATSEMI
include/config_phylib_all_drivers.h:#define CONFIG_PHY_NATSEMI
include/configs/pengwyn.h:#define CONFIG_PHY_NATSEMI
include/configs/rut.h:#define CONFIG_PHY_NATSEMI
include/configs/spear6xx_evb.h:#define CONFIG_PHY_NATSEMI
$

as established back in 2015:

commit f96fe2c0a8a72d675532d79df49cbfe3464154a5
Author: Michal Simek <michal.simek at xilinx.com>
Date:   Wed Sep 23 19:35:31 2015 +0200

    ARM64: zynqmp: Enable NATSEMI phys

    Signed-off-by: Michal Simek <michal.simek at xilinx.com>

diff --git a/include/configs/xilinx_zynqmp.h
b/include/configs/xilinx_zynqmp.h
index 5008722bf4..eae1a4988b 100644
--- a/include/configs/xilinx_zynqmp.h
+++ b/include/configs/xilinx_zynqmp.h
@@ -193,6 +193,7 @@
 # define CONFIG_MII
 # define CONFIG_SYS_FAULT_ECHO_LINK_DOWN
 # define CONFIG_PHY_MARVELL
+# define CONFIG_PHY_NATSEMI
 # define CONFIG_PHY_TI
 #endif

  and as a second (far more trivial) example, there's this:

>>>>> RTC_DAVINCI
./drivers/rtc/Makefile:obj-$(CONFIG_RTC_DAVINCI) += davinci.o

where does that string occur? apparently, in only one place so it
clearly is utterly worthless as it is currently spelled:

$ git grep RTC_DAVINCI
drivers/rtc/Makefile:obj-$(CONFIG_RTC_DAVINCI) += davinci.o
$

  anyway, people are free to peruse that page to see if anything jumps
out at them. i'll spend a few minutes today wiki'ing all of the
scripts so people can run them on whatever part of the code base
amuses them. thanks for your patience.

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                         http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================