From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752846AbbALJ0g (ORCPT ); Mon, 12 Jan 2015 04:26:36 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:32012 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752677AbbALJXY (ORCPT ); Mon, 12 Jan 2015 04:23:24 -0500 X-AuditID: cbfec7f4-b7f126d000001e9a-46-54b3928a66b3 From: Krzysztof Kozlowski To: Chris Ball , Ulf Hansson , Jaehoon Chung , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, Kukjin Kim , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Cc: Kyungmin Park , Bartlomiej Zolnierkiewicz , Marek Szyprowski , Krzysztof Kozlowski Subject: [RFC 2/3] ARM: dts: Specify MSHC realistic clocks and use frequency scaling Date: Mon, 12 Jan 2015 10:23:04 +0100 Message-id: <1421054585-9032-3-git-send-email-k.kozlowski@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1421054585-9032-1-git-send-email-k.kozlowski@samsung.com> References: <1421054585-9032-1-git-send-email-k.kozlowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBLMWRmVeSWpSXmKPExsVy+t/xy7pdkzaHGBzcbmmxccZ6VosJl7cz Wsw/co7V4savNlaL1y8MLfofv2a2ONv0ht1i0+NrrBaXd81hszjyv5/RYsb5fUwWa4/cZbc4 vjbcgddj06pONo871/aweWxeUu9x49VCJo++LasYPT5vkgtgi+KySUnNySxLLdK3S+DKuH5r PVvBd/aKR2s+sjYwXmDrYuTkkBAwkVj34SwLhC0mceHeeqA4F4eQwFJGiZZTW1ggnD4miZPf ZzGBVLEJGEtsXr4ErEpEYAuTxKo1a1lBHGaBo4wSN2bdBasSFgiTOH7qDdhcFgFVieb+JnYQ m1fATeLdvbXMEPvkJE4em8wKYnMKuEscnPgDzBYCqrm6q5NpAiPvAkaGVYyiqaXJBcVJ6bmG esWJucWleel6yfm5mxghofllB+PiY1aHGAU4GJV4eCfIbA4RYk0sK67MPcQowcGsJMLrWgYU 4k1JrKxKLcqPLyrNSS0+xMjEwSnVwJgq/oLntI6wecKPgru+L7Y6yc43OXEh97DslZdGe60L NyvICYv1MOQIO/BydN9orfq2P75SrTu6qaF/zZQzVq5C745nvNDf/u/Kqa0nD3zX402VFXTY dM5xYpnp1PvCU95lKV2fkjZ3RVXHGc5NnG5RZWfuspRuyU6Jstkr3fe4sdrrgLCDmxJLcUai oRZzUXEiAG05LlQrAgAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Lower the dw_mmc host clock from 400 MHz to 100 MHz because there are a lot of MMC errors above 100 MHz. Enable frequency scaling to reduce energy consumption. In idle this reduced energy consumption by 2.6% (from 119.5 mA to 116.4 mA). Signed-off-by: Krzysztof Kozlowski --- arch/arm/boot/dts/exynos4412-trats2.dts | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/exynos4412-trats2.dts b/arch/arm/boot/dts/exynos4412-trats2.dts index 29231b452643..21f1236ae979 100644 --- a/arch/arm/boot/dts/exynos4412-trats2.dts +++ b/arch/arm/boot/dts/exynos4412-trats2.dts @@ -558,7 +558,9 @@ non-removable; card-detect-delay = <200>; vmmc-supply = <&vemmc_reg>; - clock-frequency = <400000000>; + clock-frequency = <100000000>; + clock-freq-min-max = <400000 100000000>; + frequency-scaling; samsung,dw-mshc-ciu-div = <0>; samsung,dw-mshc-sdr-timing = <2 3>; samsung,dw-mshc-ddr-timing = <1 2>; -- 1.9.1