Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752786AbaLDCuK (ORCPT ); Wed, 3 Dec 2014 21:50:10 -0500 Received: from regular1.263xmail.com ([211.150.99.139]:60538 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751904AbaLDCuI (ORCPT ); Wed, 3 Dec 2014 21:50:08 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: addy.ke@rock-chips.com X-FST-TO: heiko@sntech.de X-SENDER-IP: 127.0.0.1 X-LOGIN-NAME: addy.ke@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Addy Ke To: heiko@sntech.de, dianders@chromium.org, amstan@chromium.org, sonnyrao@chromium.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org Cc: linux@arm.linux.org.uk, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, olof@lixom.net, hj@rock-chips.com, kever.yang@rock-chips.com, xjq@rock-chips.com, huangtao@rock-chips.com, zyw@rock-chips.com, yzq@rock-chips.com, zhenfu.fang@rock-chips.com, cf@rock-chips.com, zhangqing@rock-chips.com, hl@rock-chips.com, wei.luo@rock-chips.com, Addy Ke Subject: [PATCH] ARM: dts: rockchip: set dw_mmc max-freq 150Mhz Date: Thu, 4 Dec 2014 10:49:35 +0800 Message-Id: <1417661375-2872-1-git-send-email-addy.ke@rock-chips.com> X-Mailer: git-send-email 1.8.3.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All of mmc controllers include SDMMC, SDIO0, SDIO1, and EMMC on RK3288 are limited to 150Mhz. It was mainly caused by two reasons: - RK3288's IO pad(except DDR IO pad) is generic, which can only support the max of 150Mhz. - Mmc controller was designed at 150Mhz, and the pressure test by IC team was based on this freequency point. Signed-off-by: Addy Ke --- arch/arm/boot/dts/rk3288.dtsi | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi index acb6a2f..9c35a1d 100644 --- a/arch/arm/boot/dts/rk3288.dtsi +++ b/arch/arm/boot/dts/rk3288.dtsi @@ -149,6 +149,7 @@ sdmmc: dwmmc@ff0c0000 { compatible = "rockchip,rk3288-dw-mshc"; + clock-freq-min-max = <400000 150000000>; clocks = <&cru HCLK_SDMMC>, <&cru SCLK_SDMMC>; clock-names = "biu", "ciu"; fifo-depth = <0x100>; @@ -159,6 +160,7 @@ sdio0: dwmmc@ff0d0000 { compatible = "rockchip,rk3288-dw-mshc"; + clock-freq-min-max = <400000 150000000>; clocks = <&cru HCLK_SDIO0>, <&cru SCLK_SDIO0>; clock-names = "biu", "ciu"; fifo-depth = <0x100>; @@ -169,6 +171,7 @@ sdio1: dwmmc@ff0e0000 { compatible = "rockchip,rk3288-dw-mshc"; + clock-freq-min-max = <400000 150000000>; clocks = <&cru HCLK_SDIO1>, <&cru SCLK_SDIO1>; clock-names = "biu", "ciu"; fifo-depth = <0x100>; @@ -179,6 +182,7 @@ emmc: dwmmc@ff0f0000 { compatible = "rockchip,rk3288-dw-mshc"; + clock-freq-min-max = <400000 150000000>; clocks = <&cru HCLK_EMMC>, <&cru SCLK_EMMC>; clock-names = "biu", "ciu"; fifo-depth = <0x100>; -- 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/