Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752998AbaA3Lql (ORCPT ); Thu, 30 Jan 2014 06:46:41 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:51729 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752646AbaA3Lqj (ORCPT ); Thu, 30 Jan 2014 06:46:39 -0500 From: Ivan Khoronzhuk To: , CC: , , , , , , , , Ivan Khoronzhuk Subject: [PATCH] ARM: keystone: dts: disable "msmcsram" clock Date: Thu, 30 Jan 2014 13:45:43 +0200 Message-ID: <1391082343-13371-1-git-send-email-ivan.khoronzhuk@ti.com> X-Mailer: git-send-email 1.8.3.2 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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). The MSMC provides memory protection for accesses to the MSMC SRAM and DDR3 memory from system masters. It also manages traffic among mastering peripherals and the EMIF. This means that MSMC clock is always needed by SoC and cannot be gated. It is only one from necessary clocks that was not used by any driver. So to avoid its gating at late init we have to disable it in DT. Signed-off-by: Ivan Khoronzhuk --- arch/arm/boot/dts/keystone-clocks.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/boot/dts/keystone-clocks.dtsi b/arch/arm/boot/dts/keystone-clocks.dtsi index 2363593..e7aea2e 100644 --- a/arch/arm/boot/dts/keystone-clocks.dtsi +++ b/arch/arm/boot/dts/keystone-clocks.dtsi @@ -332,6 +332,7 @@ clocks { compatible = "ti,keystone,psc-clock"; clocks = <&chipclk1>; clock-output-names = "msmcsram"; + status = "disabled"; reg = <0x02350038 0xb00>, <0x0235001c 0x400>; reg-names = "control", "domain"; domain-id = <7>; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/