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From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Boris Brezillon <boris.brezillon@bootlin.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Alexandre Belloni <alexandre.belloni@bootlin.com>
Subject: [PATCH v4 4/6] ARM: at91: Implement clocksource selection
Date: Wed, 18 Apr 2018 12:51:41 +0200	[thread overview]
Message-ID: <20180418105143.3577-5-alexandre.belloni@bootlin.com> (raw)
In-Reply-To: <20180418105143.3577-1-alexandre.belloni@bootlin.com>

Allow selecting and unselecting the PIT clocksource driver so it doesn't
have to be compile when unused.

Tested-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 arch/arm/mach-at91/Kconfig | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 1254bf9d91b4..64f18cd220b9 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -106,6 +106,31 @@ config SOC_AT91SAM9
 	    AT91SAM9X35
 	    AT91SAM9XE
 
+comment "Clocksource driver selection"
+
+config ATMEL_CLOCKSOURCE_PIT
+	bool "Periodic Interval Timer (PIT) support"
+	depends on SOC_AT91SAM9 || SOC_SAMA5
+	default SOC_AT91SAM9 || SOC_SAMA5
+	select ATMEL_PIT
+	help
+	  Select this to get a clocksource based on the Atmel Periodic Interval
+	  Timer. It has a relatively low resolution and the TC Block clocksource
+	  should be preferred.
+
+config ATMEL_CLOCKSOURCE_TCB
+	bool "Timer Counter Blocks (TCB) support"
+	depends on SOC_AT91RM9200 || SOC_AT91SAM9 || SOC_SAMA5 || COMPILE_TEST
+	default SOC_AT91RM9200 || SOC_AT91SAM9 || SOC_SAMA5
+	depends on !ATMEL_TCLIB
+	select ATMEL_ARM_TCB_CLKSRC
+	help
+	  Select this to get a high precision clocksource based on a
+	  TC block with a 5+ MHz base clock rate.
+	  On platforms with 16-bit counters, two timer channels are combined
+	  to make a single 32-bit timer.
+	  It can also be used as a clock event device supporting oneshot mode.
+
 config HAVE_AT91_UTMI
 	bool
 
-- 
2.17.0

  parent reply	other threads:[~2018-04-18 10:52 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-18 10:51 [PATCH v4 0/6] clocksource: rework Atmel TCB timer driver Alexandre Belloni
2018-04-18 10:51 ` [PATCH v4 1/6] ARM: at91: add TCB registers definitions Alexandre Belloni
2018-04-26 16:52   ` Sebastian Andrzej Siewior
2018-04-26 17:48     ` Alexandre Belloni
2018-04-18 10:51 ` [PATCH v4 2/6] clocksource/drivers: Add a new driver for the Atmel ARM TC blocks Alexandre Belloni
2018-04-18 10:51 ` [PATCH v4 3/6] clocksource/drivers: atmel-pit: make option silent Alexandre Belloni
2018-04-18 10:51 ` Alexandre Belloni [this message]
2018-04-18 10:51 ` [PATCH v4 5/6] ARM: configs: at91: use new TCB timer driver Alexandre Belloni
2018-04-18 10:51 ` [PATCH v4 6/6] ARM: configs: at91: unselect PIT Alexandre Belloni
2018-04-26 16:46 ` [PATCH v4 0/6] clocksource: rework Atmel TCB timer driver Sebastian Andrzej Siewior
2018-04-26 18:52   ` Alexandre Belloni
2018-05-02 13:34     ` Sebastian Andrzej Siewior
2018-05-02 18:10       ` Alexandre Belloni
2018-05-15 17:26         ` Sebastian Andrzej Siewior

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