linux-kernel - [PATCH] clocksource: versatile: Allow CONFIG_CLKSRC

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Date:   Fri, 17 Apr 2020 16:20:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] clocksource: versatile: Allow CONFIG_CLKSRC_VERSATILE to be disabled

The timer-versatile driver provides a sched_clock for certain Arm Ltd.
reference platforms. Specifically, it is used on Versatile and 32-bit
VExpress. It is not needed for those platforms with an arch timer (all
the 64-bit ones) yet CONFIG_MFD_VEXPRESS_SYSREG does still need to be
enabled. In that case, the timer-versatile can only be disabled when
COMPILE_TEST is enabled which is not desirable. Let's use the sub-arch
kconfig symbols instead.

Realview platforms don't have the sysregs that this driver uses so
correct the help text.

Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Rob Herring <robh@...nel.org>
---
This is part of a larger effort to modularize Versatile Express support, 
but this change doesn't have any dependency, so it can be applied 
independently.

Rob

 drivers/clocksource/Kconfig | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index f2142e6bbea3..679b35fc07a8 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -562,12 +562,11 @@ config CLKSRC_VERSATILE
 	bool "ARM Versatile (Express) reference platforms clock source" if COMPILE_TEST
 	depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
 	select TIMER_OF
-	default y if MFD_VEXPRESS_SYSREG
+	default y if (ARCH_VEXPRESS || ARCH_VERSATILE) && ARM
 	help
 	  This option enables clock source based on free running
 	  counter available in the "System Registers" block of
-	  ARM Versatile, RealView and Versatile Express reference
-	  platforms.
+	  ARM Versatile and Versatile Express reference platforms.
 
 config CLKSRC_MIPS_GIC
 	bool
-- 
2.20.1