On Fri, 07 Aug 2020, Michael Walle wrote:

Hi Uwe, Hi Lee,

Am 2020-08-06 10:40, schrieb Uwe Kleine-König:

quoted

On Mon, Aug 03, 2020 at 11:35:52AM +0200, Michael Walle wrote:

quoted

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 7dbcf6973d33..a0d50d70c3b9 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig

@@ -428,6 +428,16 @@ config PWM_SIFIVE
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-sifive.

+config PWM_SL28CPLD
+	tristate "Kontron sl28cpld PWM support"
+	select MFD_SIMPLE_MFD_I2C

Is it sensible to present this option to everyone? Maybe

	depends on SOME_SYMBOL_ONLY_TRUE_ON_SL28CPLD || COMPILE_TEST

Because there is now no real MFD driver anymore, there is also
no symbol for that. The closest would be ARCH_ARM64 but I don't
think that is a good idea.

Lee, what do you think about adding a symbol to the MFD, which
selects MFD_SIMPLE_MFD_I2C but doesn't enable any C modules?

I.e.
config MFD_SL28CPLD
    tristate "Kontron sl28cpld"
    select MFD_SIMPLE_MFD_I2C
    help
      Say yes here to add support for the Kontron sl28cpld board
      management controller.

Then all the other device driver could depend on the MFD_SL28CPLD
symbol.

You want to add a virtual symbol to prevent having to present a real
one?  How is that a reasonable solution?

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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