From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Khoronzhuk Subject: [PATCH v2] ARM: keystone: dts: drop "msmcsram" clock node Date: Thu, 30 Jan 2014 20:10:00 +0200 Message-ID: <1391105400-31602-1-git-send-email-ivan.khoronzhuk@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: robh+dt@kernel.org, galak@codeaurora.org Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux@arm.linux.org.uk, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, linux-kernel@vger.kernel.org, santosh.shilimkar@ti.com, Ivan Khoronzhuk , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org At late init all unused clocks are disabled. So clocks that were not get before will be gated. In Keysone 2 SoC we have at least one necessary clock that is not used by any driver - "msmcsram". This clock is necessary, because it supplies the Multicore Shared Memory Controller (MSMC). MSMC is the coherency interconnect and all the coherent masters are connected to it including devices which are not under Linux OS control. MSMC clock should not be touched even in low power states. So drop the clock node, otherwise 'clk_ignore_unused' parameter will disable the clock leading to system stall. Signed-off-by: Ivan Khoronzhuk --- Based on git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone.git keystone/master v1..v2: - dropped "msmcsram" clock node, instead disabling - updated comment message arch/arm/boot/dts/keystone-clocks.dtsi | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/arch/arm/boot/dts/keystone-clocks.dtsi b/arch/arm/boot/dts/keystone-clocks.dtsi index 2363593..98ad488 100644 --- a/arch/arm/boot/dts/keystone-clocks.dtsi +++ b/arch/arm/boot/dts/keystone-clocks.dtsi @@ -327,16 +327,6 @@ clocks { domain-id = <6>; }; - clkmsmcsram: clkmsmcsram { - #clock-cells = <0>; - compatible = "ti,keystone,psc-clock"; - clocks = <&chipclk1>; - clock-output-names = "msmcsram"; - reg = <0x02350038 0xb00>, <0x0235001c 0x400>; - reg-names = "control", "domain"; - domain-id = <7>; - }; - clkgem0: clkgem0 { #clock-cells = <0>; compatible = "ti,keystone,psc-clock"; -- 1.8.3.2