From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755380AbbCMV6b (ORCPT ); Fri, 13 Mar 2015 17:58:31 -0400 Received: from down.free-electrons.com ([37.187.137.238]:53275 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754702AbbCMV5c (ORCPT ); Fri, 13 Mar 2015 17:57:32 -0400 From: Alexandre Belloni To: Nicolas Ferre Cc: Boris Brezillon , Jean-Christophe Plagniol-Villard , Arnd Bergmann , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Alexandre Belloni Subject: [PATCH v3 7/7] ARM: at91: drop AT91_TIMER_HZ Date: Fri, 13 Mar 2015 22:57:24 +0100 Message-Id: <1426283844-463-8-git-send-email-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1426283844-463-1-git-send-email-alexandre.belloni@free-electrons.com> References: <1426283844-463-1-git-send-email-alexandre.belloni@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Drop AT91_TIMER_HZ as this can be handled using HZ_FIXED. Initial help message was: On AT91rm9200 chips where you're using a system clock derived from the 32768 Hz hardware clock, this tick rate should divide it exactly: use a power-of-two value, such as 128 or 256, to reduce timing errors caused by rounding. Signed-off-by: Alexandre Belloni --- arch/arm/Kconfig | 2 +- arch/arm/mach-at91/Kconfig | 18 ------------------ 2 files changed, 1 insertion(+), 19 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a1d153098001..8d5c4f9c15f9 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1502,7 +1502,7 @@ config HZ_FIXED int default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ ARCH_S5PV210 || ARCH_EXYNOS4 - default AT91_TIMER_HZ if ARCH_AT91 + default 128 if SOC_AT91RM9200 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY default 0 diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 4662eae06753..da977699c037 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -100,22 +100,4 @@ config SOC_SAMA5 select SOC_SAM_V7 select SRAM if PM -comment "Atmel SoCs Feature Selections" - -config AT91_TIMER_HZ - int "Kernel HZ (jiffies per second)" - range 32 1024 - depends on ARCH_AT91 - default "128" if SOC_AT91RM9200 - default "100" - help - On AT91rm9200 chips where you're using a system clock derived - from the 32768 Hz hardware clock, this tick rate should divide - it exactly: use a power-of-two value, such as 128 or 256, to - reduce timing errors caused by rounding. - - On AT91sam926x chips, or otherwise when using a higher precision - system clock (of at least several MHz), rounding is less of a - problem so it can be safer to use a decimal values like 100. - endif -- 2.1.0